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This chapter describes the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis and its main components.
Note | Throughout the remainder of this guide, the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis is referred to as the Cisco CRS 4-slot line card chassis, or simply the chassis. |
The Cisco CRS 4-slot line card chassis documentation set is workflow-based. There are three core documents that describe the processes required to successfully plan for and install the chassis:
Use this guide in advance of receiving the chassis to confirm that you have the needed space, tools, utilities, manpower, and so on. that are needed to perform the steps in the unpacking, moving, and securing guide and the installation guide.
This guide is included with the chassis shipment. It includes all Cisco CRS 4-slot line card chassis unpacking, moving, and securing information.
This guide is used to initially install the chassis and describes how to remove and install field- replaceable units (FRUs).
Note | This system description is a reference document. It details the chassis, its power and cooling system, the switch fabric, and other components. No procedural steps are presented in this document. |
The following sections are included:
The Cisco CRS router is a highly scalable routing platform designed for efficient service-provider point-of-presence (POP) evolution as the IP network grows into a multiservices network. The Cisco CRS router is currently available in 4-slot, 8-slot, 16-slot, and multishelf configurations.
The introduction of the Cisco CRS 4-slot line card chassis allows service providers to utilize the power and features of a CRS chassis, but without the space and power requirements associated with the larger versions of the chassis. The Cisco CRS 4-slot line card chassis is a mechanical enclosure that contains four slots for modular services cards (MSCs), forwarding processor (FP) cards, label switch processor (LSP) cards, and associated physical layer interface modules (PLIMs), plus four slots for the switch fabric. The MSC, FP, and LSP cards are also called line cards.
The chassis is installed in a standard external rack and contains its own power and cooling systems. The chassis also contains route processor (RP) cards that perform routing-protocol calculations. The RPs distribute forwarding tables to the line cards, provide a control path to each line card for system monitoring functions, and contain hard disks for system and error logging. RPs plug into two dedicated slots in the Cisco CRS 4-slot line card chassis.
Every Cisco CRS 4 slot line card chassis has 4 MSC slots, each with up to 140 gigabits per second (Gbps) with bi-directional forwarding capacity (4 slots x 140 Gbps x 2 directions). The router is built around a scalable, distributed three-stage Benes switch fabric and a variety of data interfaces providing a total system forwarding capacity of 1,120 Gbps (or 1.12 Tbps).
The data interfaces are contained on physical layer interface modules (PLIMs) that are mated in the Cisco CRS 4-slot line card chassis, to an associated line card. The line cards are cross-connected to each other through the switch fabric.
The main features of the Cisco CRS-1 Series 4-slot line card chassis include:
This section summarizes the main components of the Cisco CRS 4-slot line card chassis. It primarily identifies the components that are considered field-replaceable units (FRUs), but where additional detail is useful, also identifies subassemblies that are not field replaceable.
The Cisco CRS 4-slot line card chassis contains the following components:
A line card can be associated with several different PLIMs, which provide different interface speeds and technologies. The PLIM types that are available are as follows:
For complete PLIM information, see the Cisco CRS Carrier Routing System Packet-over-SONET/SDH Physical Layer Interface Module Installation Note and the Cisco CRS Carrier Routing System Gigabit Ethernet Physical Layer Interface Module Installation Note.
A Performance Route Processor (PRP) is also available for the Cisco CRS 4-slot line card chassis. Two PRPs perform the same functions as two RPs, but provide enhanced performance for both route processing and system controller functionality.
Note | A chassis may not be populated with a mix of RP and PRP cards. Both route processor cards should be of the same type (RP or PRP). |
The front of the chassis contains the RPs, MSCs, FPs, LSPs, and PLIMs. This is where user data cables attach to the PLIMs and where cool air enters the chassis. The rear of the chassis contains the fan tray and the SFCs.
This figure shows the front view of the Cisco CRS 4-slot line card chassis.
1 |
PLIM slots |
2 |
MSC slots |
3 |
RP slots |
4 |
Air intake |
5 |
Power modules (behind air filter) |
|
|
This figure shows the rear view of the chassis.
1 |
Fan tray |
2 |
Switch fabric card (half-height) slots |
This section describes the location and slot numbers for cards and modules that plug into the chassis. The following shows the slot numbers on the front side of the Cisco CRS 4-slot line card chassis.
1 |
MSC slot 0 |
7 |
PLIM slot 2 |
2 |
MSC slot 1 |
8 |
PLIM slot 3 |
3 |
MSC slot 2 |
9 |
RP slot (RP0) |
4 |
MSC slot 3 |
10 |
RP slot (RP1) |
5 |
PLIM slot 0 |
11 |
Air intake |
6 |
PLIM slot 1 |
12 |
Power shelf (PS) |
The following figure shows the slot numbers on the rear side of the Cisco CRS 4-slot line card chassis.
1 |
Fan tray (FT0) |
4 |
Switch fabric card slot (SM1) |
2 |
Switch fabric card slot (SM3) |
5 |
Switch fabric card slot (SM0) |
3 |
Switch fabric card slot (SM2) |
|
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The Cisco CRS 4-slot line card chassis has cable management features for the front (PLIM) side of the chassis, just above the card cage. The horizontal cable management trays have a special telescoping feature that allows them to be extended when the chassis is upgraded with higher-density cards. This extension also helps when installing the cables in the chassis.
This figure shows the cable management bracket for the chassis.
See the Cisco CRS Carrier Routing System 4-Slot Line Card Chassis Installation Guide for detailed information about chassis cabling and cable management.
The following table lists the compatibility of 40G CRS and 140G CRS fabric, forwarding, and line card components for the CRS 8-slot system.
Note | A router with a mix of 40G and 140G fabric cards is not a supported mode of operation. Such a mode is temporarily allowed only during the upgrade process. |
See Cisco CRS-1 Carrier Routing System to Cisco CRS-3 Carrier Routing System Upgrade Guide for a detailed procedure for upgrading a 40 Gbps CRS to a 140 Gbps CRS.
Switch Fabric |
RP/DRP |
MSC/FP |
PLIMS |
Note |
---|---|---|---|---|
CRS-4-FC/S(40G) |
RP-A (CRS-4-RP), DRP-B (CRS-DRP-B) |
CRS-MSC-B |
1OC768-DPSK/C 1OC768-ITU/C 1OC768-POS-SR 4-10GE-ITU/C 8-10GBE CRS1-SIP-800 |4-10GE 42-1GE 20-1GE-FLEX 2-10GE-WL-FLEX 4-10GBE-WL-XFP 8-10GBE-WL-XFP |
|
RP-A (CRS-4-RP), DRP-B (CRS-DRP-B) |
CRS-FP40 |
4-10GE 42-1GE 20-1GE-FLEX2-10GE-WL-FLEX |
|
|
CRS-4-FC140/S(140G) |
RP-A (CRS-4-RP), DRP-B (CRS-DRP-B) |
CRS-MSC-B |
1OC768-DPSK/C 1OC768-ITU/C 1OC768-POS-SR 4-10GE-ITU/C 8-10GBE CRS1-SIP-800 4-10GE 42-1GE 20-1GE-FLEX 2-10GE-WL-FLEX 4-10GBE-WL-XFP 8-10GBE-WL-XFP |
|
RP-A (CRS-4-RP), DRP-B (CRS-DRP-B) |
CRS-FP40 |
4-10GE 42-1GE 20-1GE-FLEX 2-10GE-WL-FLEX |
|
|
PRP (CRS-4-PRP-6G, CRS-4-PRP-12G) |
CRS-MSC-140G |
14X10GBE-WL-XFP 20X10GBE-WL-XFP 1x100GBE |
|
|
PRP (CRS-4-PRP-6G, CRS-4-PRP-12G) |
CRS-FP140 |
14X10GBE-WL-XFP 20X10GBE-WL-XFP 1x100GBE |
|
|
PRP (CRS-4-PRP-6G, CRS-4-PRP-12G) |
CRS-LSP |
14X10GBE-WL-XFP 20X10GBE-WL-XFP 1x100GBE |
|