2024年2月21日发(作者：臧宏峻)
Nokia 7950 Extensible Routing System
Release 15The Nokia 7950 XRS is a next-generation core routing platform that delivers
the scale, efficiency and versatility needed to stay ahead of evolving service
demands driven by the cloud, LTE/5G and the Internet of Things.
Scale, efficiency and versatility are critical success
factors for network operators in order to sustain
profitable growth in a fiercely competitive market
where the only constant is change.
Proven innovations lie at the heart of the 7950 XRS
family, from its silicon to its software and its integration
capabilities. It allows building a core network with
headroom to meet capacity demands well into the
next decade while covering the full range of capabilities
to cost-effectively address your IP routing, Internet
peering, multiprotocol label switching (MPLS) and
infrastructure service requirements on a common
core conventional wisdom is that cost-efficient scaling
of core networks can only be achieved by reducing the
scope of functionality and range of flexibility. However,
just adding more capacity inevitably results in unwieldy,
multi-tier core networks with rapidly diminishing
returns and poor investment protection. The 7950 XRS
achieves scale and efficiency without compromising
versatility. This enables network operators to rethink
these conventions and build a capable and converged
core network that can scale in a smart way, with superior
returns on investments.
The 7950 XRS is deployed globally by telecom, cable,
mobile, utility and private network operators of any
size as well as major Web-scale operators and internet
exchange providers.1Data sheetNokia 7950 Extensible Routing System
7950 XRS family overviewThe 7950 XRS family consists of three systems
that are designed to meet the needs of global,
national, regional and private network operators
of all sizes: the 7950 XRS-20, -20e and - offers a common platform that addresses the
full spectrum of networking needs for public and
private internet backbones and peering points,
metropolitan and regional aggregation hubs
as well as cloud, data center and mobile core
infrastructure. This will enable network operators
to deliver the immersive ultra-broadband service
experiences that consumers aspire to today
and will expect tomorrow.
IP/optical integrationTunable 10G and integrated 100G coherent
PM-QPSK tunable DWDM optics enable the
7950 XRS to directly interface with the photonic
transport layer without requiring optical
transponders.A standards-based GMPLS user-network interface
(UNI) enables IP/optical control plane integration,
allowing the 7950 XRS to efficiently coordinate
IP routing and transport requirements across
administrative boundaries and to dynamically set
up optical segments and end-to-end transport
-domain managementThe 7950 XRS is managed by the Nokia Network
Services Platform (NSP), supporting integrated
element and network management with end-to-end
orchestration of network resource provisioning and
assurance operations. Operational tools, including
the Nokia 5650 Control Plane Assurance Manager
(CPAM), provide additional visibility and flexibility
in monitoring and trouble-shooting IP control
plane platform for all servicesThe 7950 XRS addresses the full range of core
routing requirements using common hardware
that is powered by programmable FP3 routing
silicon and runs the proven, resilient and feature-rich Service Router Operating System (SR OS).A flexible, pay-as-you-go software licensing
model allows you to build a versatile, reliable and
converged core network that evolves with your
needs while protecting your hardware investments.
Carrier SDN integrationThe 7950 XRS and SR OS enable multivendor SDN
control integration through OpenFlow, PCEP and
NETCONF/YANG. Network operators can leverage the
7950 XRS in combination with the NSP to introduce
scalable and integrated carrier SDN control across IP,
MPLS, Ethernet and optical transport NSP supports unified service automation and
network optimization with comprehensive path
computation capabilities to enable source-based
routing and traffic steering with segment routing
support, online traffic engineering and resource
optimization, and elastic bandwidth services for
dynamic cloud with superior economicsA modular and extensible hardware design
ensures granular and economical scaling of
switching capacity and port density. A 7950 XRS
chassis equipped with FP3 hardware delivers up to
16 Tb/s (up to 80 100GE or 800 10GE ports) in a
single 19-in rack, and consumes only a single Watt
per gigabit of traffic switched. System capacity can
be expanded to 32 Tb/s in a back-to-back chassis
configuration and each chassis is designed to scale
much higher with next generation FP hardware.
2Data sheetNokia 7950 Extensible Routing System
7950 XRS-40The Nokia 7950 XRS-40 provides
32 Tb/s of routing capacity in a
single system when fully equipped
with FP3 hardware. The system
comprises 40 slots in a dual-chassis
configuration of two 7950 XRS-20
or two 7950 XRS-20e systems, with
each slot supporting 400 Gb/s of full
duplex aggregate interface capacity.
The two systems are interconnected
through optical backplane cabling and
can be placed up to 30 meters apart.
One chassis will act as the master
and assume system control over
the extension chassis as well.
Designed to meet the needs of
today’s largest Internet backbones
and aggregation points, a single
7950 XRS-40 core router can handle
up to 160 100GE or 1600 10GE
interfaces without oversubscription
and achieve full port density without
requiring cabling breakout panels.7950 XRS-20The Nokia 7950 XRS-20 provides
16 Tb/s of routing capacity in a single
19-in rack when fully equipped with
FP3-based hardware, and its chassis
and common hardware is designed
to scale much higher in the 20 slots, each initially capable
of 400 Gb/s of full duplex aggregate
interface capacity, the system
supports up to 80 100GE or 800
10GE ports in a single rack using
standards-based pluggable optics
and without requiring additional
breakout panels for 7950 XRS-20 system is available
in an extensible and a stand-alone
configuration. The extensible
configuration is equipped with optical
backplane connectors and can be
upgraded in-service to a 7950 XRS-40
back-to-back configuration to double
system capacity. The standalone
configuration can be made extensible
by exchanging the Switch Fabric
Modules.7950 XRS-20eThe Nokia 7950 XRS-20e runs
SR OS release 13.0 or higher and
is functionally compatible with
the XRS-20. All XRS-20 hardware
components except the fan trays
and XRS Control Modules are
“Universal” chassis variant
supports all AC and DC power
options and is equipped with a
Power Connection Panel at the rear.
The “AC/HVDC” variant is cabled at
the front and has a blank rear 7950 XRS-20e introduces a
new XRS Control Module (XCM)
with additional air-intake capacity.
Air movement and noise levels
are further improved through an
upgraded cooling fan assembly
with slanted centrifugal impeller
trays and 2+1 redundancy.3Data sheetNokia 7950 Extensible Routing System
Common elements and attributesThe 7950 XRS core router family shares
fundamental attributes that ensure consistency,
operational ease of use, and investment protection
for network ing systemThe 7950 XRS family is based on the proven SR OS,
carrying forward over a decade of experience in the
IP networks of more than 750 network operators
worldwide. With a single common OS across the Nokia
routing portfolio, network operators benefit from
an extensive track record of reliability in the field
and a full suite of features to enable resiliency, high
availability and in-service software upgrade (ISSUs).
Routing siliconThe 7950 XRS leverages internally developed
NPU routing silicon to ensure optimal performance
and scaling of a rich and complete Layer 2 and
Layer 3 feature set that addresses all core
deployment scenarios. The 400G FP3 chipset is
the third-generation NPU and provides the perfect
geometry for high-density 10, 40, 100 and 400G
interface modules. It offers deterministic forwarding
performance with advanced traffic management
features and energy-efficient power gating
techniques.
These silicon innovations drive the high level
of flexibility and performance needed for
converged backbone and metro core deployments,
including IP routing and peering, MPLS switching,
VPN infrastructure services and data center
interconnection l integrationMany operators are looking to optimize the overall
efficiency of the core through closer integration
of the IP and optical domains. Tunable, pluggable
DWDM optics for 10GE and 100GE interfaces are
available for all platforms. Multi-vendor IP/optical
control plane integration is supported by means
of the GMPLS UNI.
Power and cooling efficiency
The 7950 XRS system design incorporates
intelligent power management capabilities
to monitor power consumption of individual
components, assure power safety thresholds,
and manage power-up and power-down priorities
in the event of degraded power availability. Other
key enhancements include clock gating techniques
that dynamically reduce power to system
components not in ant, modular fan trays that are linearly
modulated provide appropriate and efficient cooling
with reduced noise levels. The 7950 XRS-20 uses
two linear, 1+1 redundant fan trays in a stacked
configuration for primary system cooling while
the XRS-20e uses three impeller fan trays in a
side-by-side configuration.
A “pull” airflow design, in combination with
impedance panels and air guides, ensures an even
distribution of air to every section of the system.
Hot air exhaust through the back of the chassis
ensures a clean separation between the hot and
cold aisles. An optional top plenum accessory is
available for the 7950 XRS-20 to enable hot air
exhaust at the top of the chassis for additional
cooling ace modulesThe Nokia 7950 XRS uses a pair of complementary
modules to support current and future interfaces.
XMA Control Modules (XCMs) contain a slot-level
control plane subsystem and switch fabric interface.
XRS Media Adapters (XMAs) contain the forwarding
complex and provide a wide range of GE, 10GE,
40GE and 100GE interface options.
A flexible software licensing scheme allows
for customizing XMAs for diverse core router
applications, with configurable quality of service
(QoS) granularity. This enables operators to
consolidate core routing systems on a single
platform, and to rapidly respond to evolving
requirements with minimal impact and maximum
investment protection.4Data sheetNokia 7950 Extensible Routing System
Hardware overviewAll common equipment components are redundant
and field replaceable to maximize system uptime.
Control Processor Modules (CPMs)CPMs provide the management, security and
control plane processing for the Nokia 7950 XRS.
Redundant CPMs operate in a hitless, stateful,
failover mode. Central processing and memory
are intentionally separated from the forwarding
function on the interface modules to ensure utmost
system resiliency. Each CPM contains a full FP3
complex to protect against Denial of Service s Control Modules (CCMs)Redundant CCMs support operator access to
the Nokia 7950 XRS control and management
interfaces. The CCMs are located at the top, and
each CCM has an LCD touch-screen display and
supports interfaces for timing, management,
alarms and memory expansions.
XRS Media Adapters (XMAs)XMAs provide the interface options for the
7950 XRS, including high-density GE, 10GE, 40GE
and 100GE interfaces. They contain an FP3-based
forwarding complex that performs typical functions
such as packet lookups, traffic classification,
processing and forwarding, service enablement
and QoS. Each XMA also provides specific interface
ports, physical media and optical functions. The
range of interface modules and slot capacity
will expand over time, along with overall system
capacity, in order to accommodate the evolving
needs of network operators while protecting
their 7950 XRS hardware ed Power Equalization Modules (APEQs)APEQs provide power for the 7950 XRS and include
built-in intelligence to monitor and communicate
available power budget versus actually consumed
power. The low voltage DC APEQs deliver up to
2800W each. The high voltage DC APEQs take
260-400 V and provide 3000W each. AC APEQs
take 200-240 V single phase and deliver 3000W
each. APEQs support cost-effective modular
expansion as traysFan trays provide system cooling for the 7950 XRS.
Redundant fans can be controlled independently
and fan speed is linearly modulated to allow for the
optimal balancing of cooling, power and noise. The
7950 XRS-20 supports two stacked horizontal fan
trays with 1+1 redundancy. The XRS-20e chassis
variants support three side-by-side impeller fan
trays with 2+1 Control Modules (XCMs)XMAs are equipped in an appropriate XCM. The
XCMs contain a slot-level control plane subsystem
and fabric interface to interconnect to the switch
fabric modules (SFMs) via the chassis mid-plane.
XMCs connect via a mid-plane to deliver 800 Gb/s
full duplex slot capacity to a pair of 400G XMAs or
200G C-XMAs. The XCM variants for the 7950 XRS-20 and XRS-20e each deliver 800 Gb/s full duplex
slot capacity and support the full range of FP3 XMAs
and C-XMAs. The flexibility and modularity of XCMs
and XMAs allow network operators to granularly
configure each Nokia 7950 XRS with its desired
range of Ethernet interfaces to meet the demands
of growing core Fabric Modules (SFMs)SFMs enable the line-rate connectivity between
all slots of a 7950 XRS chassis. The fabric cards
are N+1 redundant with active redundancy and
graceful capacity degradation in case multiple
SFMs fail. There are two types of SFMs. The first is
dedicated to standalone system operation of the
7950 XRS-20 and XRS-20e. The second is equipped
with optical connectors to support back-to-back
configuration in a 7950 XRS-40 system.5Data sheetNokia 7950 Extensible Routing System
Technical specifications
Table 1. Technical specifications for the Nokia 7950 XRS family7950 XRS-40System capacity (half duplex)System expansionSystem designInterface slotsNumber of XMAs (400G line card)Number of C-XMAs (200G line
card)Common equipment
redundancy32 Tb/s (dual-chassis)—Mid-plane4040 per system40 per systemCPM (1+1), CCM (1+1), DC APEQ
(N+1), AC APEC (N+N), SFM (14+2),
fan trays (1+1), power termination
(1+1)CPM, CCM, XCM, XMA, C-XMA,
APEQ, SFM, fans2 x standard 19-in racks39 RU• Height: 173 cm (68.25 in)• Width: 44.5 cm (17.5 in)
• Depth: 91 cm (36 in)1,070.5 kg (2360 lb)• -48 V DC (2 x 12 60A/80A inputs)• 260-400 V DC (2 x 12 inputs)• 200-240 V AC (2 x 12 inputs)Front/bottom to top/back7950 XRS-2016 Tb/s (stand-alone)32 Tb/s (back-to-back)Mid-plane2020 per system20 per systemCPM (1+1), CCM (1+1), DC APEQ
(N+1), AC APEC (N+N), SFM (7+1),
fan trays (1+1), power termination
(1+1)CPM, CCM, XCM, XMA, C-XMA,
APEQ, SFM, fans1 standard 19-in rack39 RU (44 RU with top plenum)• Height: 173 cm (68.25 in)• Width: 44.5 cm (17.5 in)• Depth: 91 cm (36 in)535.2 kg (1180 lb)• -48 V DC (12 60A/80A inputs)• 260-400 V DC (12 inputs)• 200-240 V AC (12 inputs)Front/bottom to top/back7950 XRS-20e16 Tb/s (stand-alone)32 Tb/s (back-to-back)Mid-plane2020 per system20 per systemCPM (1+1), CCM (1+1), DC APEQ
(N+1), AC APEC (N+N), SFM (7+1),
fan trays (2+1), power termination
(1+1)CPM, CCM, XCM, XMA, C-XMA,
APEQ, SFM, fans1 standard 19-in rack44 RU (no top plenum)• Height: 195.6 cm (77 in)• Width: 44.5 cm (17.5 in)• Depth: 106.3 cm (41.9 in)612.35 (1350 lb)• -48 V DC (12 60A/80A inputs)• 260-400 V DC (12 inputs)• 200-240 V AC (12 inputs)Front/bottom to backHot-swappable modulesDimensionsWeight* (max)PowerCooling* Weights and dimensions are approximate and subject to change. Refer to the appropriate installation guide for the current weights and 2. Nokia 7950 XRS XMA/C-XMA support per chassis typeXMA type1GBASE (200G C-XMA)10GBASE (200G C-XMA)10GBASE (400G XMA)40GBASE (200G C-XMA)100GBASE (200G C-XMA)100GBASE (400G XMA)100G DWDM (200G XMA)400G DWDM (400G XMA)Ports per XMA36/72204062421Connector typeSFP/CSFPSFP+SFP+QSFP+CFPCXP, CFP2LC (OTU4)LC (dual carrier)Maximum port densityXRS-401440/28801608040XRS-20720/144804020XRS-20e720/1448040206Data sheetNokia 7950 Extensible Routing System
Feature and protocol support highlightsProtocol support within the 7950 XRS family
includes (but is not limited to):• Intermediate System-to-Intermediate System
(IS-IS), Open Shortest Path First (OSPF), and
Multiprotocol Border Gateway Protocol (MBGP)IPv4 and IPv6 unicast routing• Internet Group Management Protocol (IGMP),
Multicast Listener Discovery (MLD), Protocol
Independent Multicast (PIM), and Multicast
Source Discovery Protocol (MSDP) IPv4 and
IPv6 multicast routing• MPLS Label Edge Router (LER) and Label
Switching Router (LSR) functions, with support
for seamless MPLS designs• Label Distribution Protocol (LDP) and Resource
Reservation Protocol (RSVP) for MPLS Signaling
and Traffic Engineering with Segment Routing
support, Point-to-Point (P2P) and Point-to-Multipoint (P2MP) Label Switched Paths (LSPs)
with Multicast LDP (MLDP) and P2MP RSVP,
weighted Equal-Cost Multi-path (ECMP),
Inter-AS Multicast VPN (MVPN) and Next
Generation Multicast VPN (NG-MVPN)
• P2P Ethernet virtual leased lines (VLLs), Ethernet
VPNs (EVPNs), EVPN-MLDP, EVPN-VPWS, Virtual
Extensible LAN (VXLAN), EVPN-VXLAN to VPLS/
EVPN-VPLS gateway functions• Multipoint Ethernet VPLS and IP VPNs for use
in delivering core infrastructure services• Ethernet port expansion through remote
Nokia 7210 Service Access Switch (SAS) Ethernet
satellites, each offering 24/48GE ports over a
4 x 10GE Link Aggregation Group (LAG) under
7950 XRS control• Unicast Reverse Path Forwarding (uRPF),
RADIUS/TACACS+, and comprehensive control
plane protection features for security• Extensive OAM features, including Cflowd,
Ethernet Connectivity Fault Management (CFM)
(IEEE 802.1ag, ITU-T Y.1731), Ethernet in the
First Mile (EFM) (IEEE 802.3ah), Two-Way Active
Measurement Protocol (TWAMP), Bi-Directional
Fault Detection (BFD), and a full suite of MPLS
OAM tools including GMPLS UNI
• Intelligent packet classification, queue servicing,
policing and buffer management• Industry-leading high availability, including
nonstop routing, nonstop services, ISSU,
fast reroute, pseudowire redundancy, ITU-T
G.8031 and G.8032, weighted mixed-speed
link aggregation• Management via CLI, SNMP MIBs, NETCONF/YANG and service assurance agent (SAA) with
comprehensive support through the Nokia
5620 SAM• Multivendor SDN control integration through
OpenFlow, PCEP, BGP-LS interface supportEnvironmental specifications• Operating temperature: 5°C to 40°C
(41°F to 104°F)• Operating relative humidity: 5% to 85%• Operating altitude: Up to 4000 m (13,123 ft)
at 30°C (86°F)Safety standards and compliance agency certifications• IEC/EN/UL/CSA60950-1 Ed2 Am2• FDA CDRH 21-CFR 1040• IEC/EN 60825-1• IEC/EN 60825-27Data sheetNokia 7950 Extensible Routing System
EMC emission• ICES-003 Class A
• FCC Part 15 Class A
(with EMI/Protection panel)• EN 55032 Class A• CISPR 32 Class A• AS/NZS CISPR 32 Class A• VCCI Class A• KN 32 Class A• EN 61000-3-2• EN 61000-3-3EMC immunity• ETSI EN 300 386• EN 55024• KN 35Environmental• ETSI EN 300 019-2-1 Storage Tests, Class 1.2• ETSI EN 300 019-2-2 Transportation Tests,
Class 2.3• ETSI EN 300 019-2-3 Operational Tests, Class 3.2• ETSI EN 300 019-2-4, pr A 1 Seismic• ETSI EN 300 132-2 DC Power Supply Interface• ETSI EN 300 132-3-1 HVDC Power Supply
Interface• WEEE• RoHS• China CRoHSNetwork Equipment Building System (NEBS)• NEBS Level 3• RBOC requirements– ATIS-0600020– ATIS-0600010.3– ATIS-0600015– ATIS-0600015.03– ATT-TP-76200– .9205 TEEER– .9305MEF certifications• CE 2.0– Certified (on E-LAN, E-Line, E-Tree and
E-Access MEF service types)– 100G Certified (on E-Line and E-Access
MEF service types)• CE 1.0 (MEF 9 and MEF 14)
– CertifiedNokia is a registered trademark of Nokia Corporation. Other product and company names
mentioned herein may be trademarks or trade names of their respective owners.
Nokia Oyj
Karaportti 3
FI-02610 Espoo
Finland
Tel. +358 (0) 10 44 88 000Product code: SR1702007527EN (March)© 2017
2024年2月21日发(作者：臧宏峻)
Nokia 7950 Extensible Routing System
Release 15The Nokia 7950 XRS is a next-generation core routing platform that delivers
the scale, efficiency and versatility needed to stay ahead of evolving service
demands driven by the cloud, LTE/5G and the Internet of Things.
Scale, efficiency and versatility are critical success
factors for network operators in order to sustain
profitable growth in a fiercely competitive market
where the only constant is change.
Proven innovations lie at the heart of the 7950 XRS
family, from its silicon to its software and its integration
capabilities. It allows building a core network with
headroom to meet capacity demands well into the
next decade while covering the full range of capabilities
to cost-effectively address your IP routing, Internet
peering, multiprotocol label switching (MPLS) and
infrastructure service requirements on a common
core conventional wisdom is that cost-efficient scaling
of core networks can only be achieved by reducing the
scope of functionality and range of flexibility. However,
just adding more capacity inevitably results in unwieldy,
multi-tier core networks with rapidly diminishing
returns and poor investment protection. The 7950 XRS
achieves scale and efficiency without compromising
versatility. This enables network operators to rethink
these conventions and build a capable and converged
core network that can scale in a smart way, with superior
returns on investments.
The 7950 XRS is deployed globally by telecom, cable,
mobile, utility and private network operators of any
size as well as major Web-scale operators and internet
exchange providers.1Data sheetNokia 7950 Extensible Routing System
7950 XRS family overviewThe 7950 XRS family consists of three systems
that are designed to meet the needs of global,
national, regional and private network operators
of all sizes: the 7950 XRS-20, -20e and - offers a common platform that addresses the
full spectrum of networking needs for public and
private internet backbones and peering points,
metropolitan and regional aggregation hubs
as well as cloud, data center and mobile core
infrastructure. This will enable network operators
to deliver the immersive ultra-broadband service
experiences that consumers aspire to today
and will expect tomorrow.
IP/optical integrationTunable 10G and integrated 100G coherent
PM-QPSK tunable DWDM optics enable the
7950 XRS to directly interface with the photonic
transport layer without requiring optical
transponders.A standards-based GMPLS user-network interface
(UNI) enables IP/optical control plane integration,
allowing the 7950 XRS to efficiently coordinate
IP routing and transport requirements across
administrative boundaries and to dynamically set
up optical segments and end-to-end transport
-domain managementThe 7950 XRS is managed by the Nokia Network
Services Platform (NSP), supporting integrated
element and network management with end-to-end
orchestration of network resource provisioning and
assurance operations. Operational tools, including
the Nokia 5650 Control Plane Assurance Manager
(CPAM), provide additional visibility and flexibility
in monitoring and trouble-shooting IP control
plane platform for all servicesThe 7950 XRS addresses the full range of core
routing requirements using common hardware
that is powered by programmable FP3 routing
silicon and runs the proven, resilient and feature-rich Service Router Operating System (SR OS).A flexible, pay-as-you-go software licensing
model allows you to build a versatile, reliable and
converged core network that evolves with your
needs while protecting your hardware investments.
Carrier SDN integrationThe 7950 XRS and SR OS enable multivendor SDN
control integration through OpenFlow, PCEP and
NETCONF/YANG. Network operators can leverage the
7950 XRS in combination with the NSP to introduce
scalable and integrated carrier SDN control across IP,
MPLS, Ethernet and optical transport NSP supports unified service automation and
network optimization with comprehensive path
computation capabilities to enable source-based
routing and traffic steering with segment routing
support, online traffic engineering and resource
optimization, and elastic bandwidth services for
dynamic cloud with superior economicsA modular and extensible hardware design
ensures granular and economical scaling of
switching capacity and port density. A 7950 XRS
chassis equipped with FP3 hardware delivers up to
16 Tb/s (up to 80 100GE or 800 10GE ports) in a
single 19-in rack, and consumes only a single Watt
per gigabit of traffic switched. System capacity can
be expanded to 32 Tb/s in a back-to-back chassis
configuration and each chassis is designed to scale
much higher with next generation FP hardware.
2Data sheetNokia 7950 Extensible Routing System
7950 XRS-40The Nokia 7950 XRS-40 provides
32 Tb/s of routing capacity in a
single system when fully equipped
with FP3 hardware. The system
comprises 40 slots in a dual-chassis
configuration of two 7950 XRS-20
or two 7950 XRS-20e systems, with
each slot supporting 400 Gb/s of full
duplex aggregate interface capacity.
The two systems are interconnected
through optical backplane cabling and
can be placed up to 30 meters apart.
One chassis will act as the master
and assume system control over
the extension chassis as well.
Designed to meet the needs of
today’s largest Internet backbones
and aggregation points, a single
7950 XRS-40 core router can handle
up to 160 100GE or 1600 10GE
interfaces without oversubscription
and achieve full port density without
requiring cabling breakout panels.7950 XRS-20The Nokia 7950 XRS-20 provides
16 Tb/s of routing capacity in a single
19-in rack when fully equipped with
FP3-based hardware, and its chassis
and common hardware is designed
to scale much higher in the 20 slots, each initially capable
of 400 Gb/s of full duplex aggregate
interface capacity, the system
supports up to 80 100GE or 800
10GE ports in a single rack using
standards-based pluggable optics
and without requiring additional
breakout panels for 7950 XRS-20 system is available
in an extensible and a stand-alone
configuration. The extensible
configuration is equipped with optical
backplane connectors and can be
upgraded in-service to a 7950 XRS-40
back-to-back configuration to double
system capacity. The standalone
configuration can be made extensible
by exchanging the Switch Fabric
Modules.7950 XRS-20eThe Nokia 7950 XRS-20e runs
SR OS release 13.0 or higher and
is functionally compatible with
the XRS-20. All XRS-20 hardware
components except the fan trays
and XRS Control Modules are
“Universal” chassis variant
supports all AC and DC power
options and is equipped with a
Power Connection Panel at the rear.
The “AC/HVDC” variant is cabled at
the front and has a blank rear 7950 XRS-20e introduces a
new XRS Control Module (XCM)
with additional air-intake capacity.
Air movement and noise levels
are further improved through an
upgraded cooling fan assembly
with slanted centrifugal impeller
trays and 2+1 redundancy.3Data sheetNokia 7950 Extensible Routing System
Common elements and attributesThe 7950 XRS core router family shares
fundamental attributes that ensure consistency,
operational ease of use, and investment protection
for network ing systemThe 7950 XRS family is based on the proven SR OS,
carrying forward over a decade of experience in the
IP networks of more than 750 network operators
worldwide. With a single common OS across the Nokia
routing portfolio, network operators benefit from
an extensive track record of reliability in the field
and a full suite of features to enable resiliency, high
availability and in-service software upgrade (ISSUs).
Routing siliconThe 7950 XRS leverages internally developed
NPU routing silicon to ensure optimal performance
and scaling of a rich and complete Layer 2 and
Layer 3 feature set that addresses all core
deployment scenarios. The 400G FP3 chipset is
the third-generation NPU and provides the perfect
geometry for high-density 10, 40, 100 and 400G
interface modules. It offers deterministic forwarding
performance with advanced traffic management
features and energy-efficient power gating
techniques.
These silicon innovations drive the high level
of flexibility and performance needed for
converged backbone and metro core deployments,
including IP routing and peering, MPLS switching,
VPN infrastructure services and data center
interconnection l integrationMany operators are looking to optimize the overall
efficiency of the core through closer integration
of the IP and optical domains. Tunable, pluggable
DWDM optics for 10GE and 100GE interfaces are
available for all platforms. Multi-vendor IP/optical
control plane integration is supported by means
of the GMPLS UNI.
Power and cooling efficiency
The 7950 XRS system design incorporates
intelligent power management capabilities
to monitor power consumption of individual
components, assure power safety thresholds,
and manage power-up and power-down priorities
in the event of degraded power availability. Other
key enhancements include clock gating techniques
that dynamically reduce power to system
components not in ant, modular fan trays that are linearly
modulated provide appropriate and efficient cooling
with reduced noise levels. The 7950 XRS-20 uses
two linear, 1+1 redundant fan trays in a stacked
configuration for primary system cooling while
the XRS-20e uses three impeller fan trays in a
side-by-side configuration.
A “pull” airflow design, in combination with
impedance panels and air guides, ensures an even
distribution of air to every section of the system.
Hot air exhaust through the back of the chassis
ensures a clean separation between the hot and
cold aisles. An optional top plenum accessory is
available for the 7950 XRS-20 to enable hot air
exhaust at the top of the chassis for additional
cooling ace modulesThe Nokia 7950 XRS uses a pair of complementary
modules to support current and future interfaces.
XMA Control Modules (XCMs) contain a slot-level
control plane subsystem and switch fabric interface.
XRS Media Adapters (XMAs) contain the forwarding
complex and provide a wide range of GE, 10GE,
40GE and 100GE interface options.
A flexible software licensing scheme allows
for customizing XMAs for diverse core router
applications, with configurable quality of service
(QoS) granularity. This enables operators to
consolidate core routing systems on a single
platform, and to rapidly respond to evolving
requirements with minimal impact and maximum
investment protection.4Data sheetNokia 7950 Extensible Routing System
Hardware overviewAll common equipment components are redundant
and field replaceable to maximize system uptime.
Control Processor Modules (CPMs)CPMs provide the management, security and
control plane processing for the Nokia 7950 XRS.
Redundant CPMs operate in a hitless, stateful,
failover mode. Central processing and memory
are intentionally separated from the forwarding
function on the interface modules to ensure utmost
system resiliency. Each CPM contains a full FP3
complex to protect against Denial of Service s Control Modules (CCMs)Redundant CCMs support operator access to
the Nokia 7950 XRS control and management
interfaces. The CCMs are located at the top, and
each CCM has an LCD touch-screen display and
supports interfaces for timing, management,
alarms and memory expansions.
XRS Media Adapters (XMAs)XMAs provide the interface options for the
7950 XRS, including high-density GE, 10GE, 40GE
and 100GE interfaces. They contain an FP3-based
forwarding complex that performs typical functions
such as packet lookups, traffic classification,
processing and forwarding, service enablement
and QoS. Each XMA also provides specific interface
ports, physical media and optical functions. The
range of interface modules and slot capacity
will expand over time, along with overall system
capacity, in order to accommodate the evolving
needs of network operators while protecting
their 7950 XRS hardware ed Power Equalization Modules (APEQs)APEQs provide power for the 7950 XRS and include
built-in intelligence to monitor and communicate
available power budget versus actually consumed
power. The low voltage DC APEQs deliver up to
2800W each. The high voltage DC APEQs take
260-400 V and provide 3000W each. AC APEQs
take 200-240 V single phase and deliver 3000W
each. APEQs support cost-effective modular
expansion as traysFan trays provide system cooling for the 7950 XRS.
Redundant fans can be controlled independently
and fan speed is linearly modulated to allow for the
optimal balancing of cooling, power and noise. The
7950 XRS-20 supports two stacked horizontal fan
trays with 1+1 redundancy. The XRS-20e chassis
variants support three side-by-side impeller fan
trays with 2+1 Control Modules (XCMs)XMAs are equipped in an appropriate XCM. The
XCMs contain a slot-level control plane subsystem
and fabric interface to interconnect to the switch
fabric modules (SFMs) via the chassis mid-plane.
XMCs connect via a mid-plane to deliver 800 Gb/s
full duplex slot capacity to a pair of 400G XMAs or
200G C-XMAs. The XCM variants for the 7950 XRS-20 and XRS-20e each deliver 800 Gb/s full duplex
slot capacity and support the full range of FP3 XMAs
and C-XMAs. The flexibility and modularity of XCMs
and XMAs allow network operators to granularly
configure each Nokia 7950 XRS with its desired
range of Ethernet interfaces to meet the demands
of growing core Fabric Modules (SFMs)SFMs enable the line-rate connectivity between
all slots of a 7950 XRS chassis. The fabric cards
are N+1 redundant with active redundancy and
graceful capacity degradation in case multiple
SFMs fail. There are two types of SFMs. The first is
dedicated to standalone system operation of the
7950 XRS-20 and XRS-20e. The second is equipped
with optical connectors to support back-to-back
configuration in a 7950 XRS-40 system.5Data sheetNokia 7950 Extensible Routing System
Technical specifications
Table 1. Technical specifications for the Nokia 7950 XRS family7950 XRS-40System capacity (half duplex)System expansionSystem designInterface slotsNumber of XMAs (400G line card)Number of C-XMAs (200G line
card)Common equipment
redundancy32 Tb/s (dual-chassis)—Mid-plane4040 per system40 per systemCPM (1+1), CCM (1+1), DC APEQ
(N+1), AC APEC (N+N), SFM (14+2),
fan trays (1+1), power termination
(1+1)CPM, CCM, XCM, XMA, C-XMA,
APEQ, SFM, fans2 x standard 19-in racks39 RU• Height: 173 cm (68.25 in)• Width: 44.5 cm (17.5 in)
• Depth: 91 cm (36 in)1,070.5 kg (2360 lb)• -48 V DC (2 x 12 60A/80A inputs)• 260-400 V DC (2 x 12 inputs)• 200-240 V AC (2 x 12 inputs)Front/bottom to top/back7950 XRS-2016 Tb/s (stand-alone)32 Tb/s (back-to-back)Mid-plane2020 per system20 per systemCPM (1+1), CCM (1+1), DC APEQ
(N+1), AC APEC (N+N), SFM (7+1),
fan trays (1+1), power termination
(1+1)CPM, CCM, XCM, XMA, C-XMA,
APEQ, SFM, fans1 standard 19-in rack39 RU (44 RU with top plenum)• Height: 173 cm (68.25 in)• Width: 44.5 cm (17.5 in)• Depth: 91 cm (36 in)535.2 kg (1180 lb)• -48 V DC (12 60A/80A inputs)• 260-400 V DC (12 inputs)• 200-240 V AC (12 inputs)Front/bottom to top/back7950 XRS-20e16 Tb/s (stand-alone)32 Tb/s (back-to-back)Mid-plane2020 per system20 per systemCPM (1+1), CCM (1+1), DC APEQ
(N+1), AC APEC (N+N), SFM (7+1),
fan trays (2+1), power termination
(1+1)CPM, CCM, XCM, XMA, C-XMA,
APEQ, SFM, fans1 standard 19-in rack44 RU (no top plenum)• Height: 195.6 cm (77 in)• Width: 44.5 cm (17.5 in)• Depth: 106.3 cm (41.9 in)612.35 (1350 lb)• -48 V DC (12 60A/80A inputs)• 260-400 V DC (12 inputs)• 200-240 V AC (12 inputs)Front/bottom to backHot-swappable modulesDimensionsWeight* (max)PowerCooling* Weights and dimensions are approximate and subject to change. Refer to the appropriate installation guide for the current weights and 2. Nokia 7950 XRS XMA/C-XMA support per chassis typeXMA type1GBASE (200G C-XMA)10GBASE (200G C-XMA)10GBASE (400G XMA)40GBASE (200G C-XMA)100GBASE (200G C-XMA)100GBASE (400G XMA)100G DWDM (200G XMA)400G DWDM (400G XMA)Ports per XMA36/72204062421Connector typeSFP/CSFPSFP+SFP+QSFP+CFPCXP, CFP2LC (OTU4)LC (dual carrier)Maximum port densityXRS-401440/28801608040XRS-20720/144804020XRS-20e720/1448040206Data sheetNokia 7950 Extensible Routing System
Feature and protocol support highlightsProtocol support within the 7950 XRS family
includes (but is not limited to):• Intermediate System-to-Intermediate System
(IS-IS), Open Shortest Path First (OSPF), and
Multiprotocol Border Gateway Protocol (MBGP)IPv4 and IPv6 unicast routing• Internet Group Management Protocol (IGMP),
Multicast Listener Discovery (MLD), Protocol
Independent Multicast (PIM), and Multicast
Source Discovery Protocol (MSDP) IPv4 and
IPv6 multicast routing• MPLS Label Edge Router (LER) and Label
Switching Router (LSR) functions, with support
for seamless MPLS designs• Label Distribution Protocol (LDP) and Resource
Reservation Protocol (RSVP) for MPLS Signaling
and Traffic Engineering with Segment Routing
support, Point-to-Point (P2P) and Point-to-Multipoint (P2MP) Label Switched Paths (LSPs)
with Multicast LDP (MLDP) and P2MP RSVP,
weighted Equal-Cost Multi-path (ECMP),
Inter-AS Multicast VPN (MVPN) and Next
Generation Multicast VPN (NG-MVPN)
• P2P Ethernet virtual leased lines (VLLs), Ethernet
VPNs (EVPNs), EVPN-MLDP, EVPN-VPWS, Virtual
Extensible LAN (VXLAN), EVPN-VXLAN to VPLS/
EVPN-VPLS gateway functions• Multipoint Ethernet VPLS and IP VPNs for use
in delivering core infrastructure services• Ethernet port expansion through remote
Nokia 7210 Service Access Switch (SAS) Ethernet
satellites, each offering 24/48GE ports over a
4 x 10GE Link Aggregation Group (LAG) under
7950 XRS control• Unicast Reverse Path Forwarding (uRPF),
RADIUS/TACACS+, and comprehensive control
plane protection features for security• Extensive OAM features, including Cflowd,
Ethernet Connectivity Fault Management (CFM)
(IEEE 802.1ag, ITU-T Y.1731), Ethernet in the
First Mile (EFM) (IEEE 802.3ah), Two-Way Active
Measurement Protocol (TWAMP), Bi-Directional
Fault Detection (BFD), and a full suite of MPLS
OAM tools including GMPLS UNI
• Intelligent packet classification, queue servicing,
policing and buffer management• Industry-leading high availability, including
nonstop routing, nonstop services, ISSU,
fast reroute, pseudowire redundancy, ITU-T
G.8031 and G.8032, weighted mixed-speed
link aggregation• Management via CLI, SNMP MIBs, NETCONF/YANG and service assurance agent (SAA) with
comprehensive support through the Nokia
5620 SAM• Multivendor SDN control integration through
OpenFlow, PCEP, BGP-LS interface supportEnvironmental specifications• Operating temperature: 5°C to 40°C
(41°F to 104°F)• Operating relative humidity: 5% to 85%• Operating altitude: Up to 4000 m (13,123 ft)
at 30°C (86°F)Safety standards and compliance agency certifications• IEC/EN/UL/CSA60950-1 Ed2 Am2• FDA CDRH 21-CFR 1040• IEC/EN 60825-1• IEC/EN 60825-27Data sheetNokia 7950 Extensible Routing System
EMC emission• ICES-003 Class A
• FCC Part 15 Class A
(with EMI/Protection panel)• EN 55032 Class A• CISPR 32 Class A• AS/NZS CISPR 32 Class A• VCCI Class A• KN 32 Class A• EN 61000-3-2• EN 61000-3-3EMC immunity• ETSI EN 300 386• EN 55024• KN 35Environmental• ETSI EN 300 019-2-1 Storage Tests, Class 1.2• ETSI EN 300 019-2-2 Transportation Tests,
Class 2.3• ETSI EN 300 019-2-3 Operational Tests, Class 3.2• ETSI EN 300 019-2-4, pr A 1 Seismic• ETSI EN 300 132-2 DC Power Supply Interface• ETSI EN 300 132-3-1 HVDC Power Supply
Interface• WEEE• RoHS• China CRoHSNetwork Equipment Building System (NEBS)• NEBS Level 3• RBOC requirements– ATIS-0600020– ATIS-0600010.3– ATIS-0600015– ATIS-0600015.03– ATT-TP-76200– .9205 TEEER– .9305MEF certifications• CE 2.0– Certified (on E-LAN, E-Line, E-Tree and
E-Access MEF service types)– 100G Certified (on E-Line and E-Access
MEF service types)• CE 1.0 (MEF 9 and MEF 14)
– CertifiedNokia is a registered trademark of Nokia Corporation. Other product and company names
mentioned herein may be trademarks or trade names of their respective owners.
Nokia Oyj
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