The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
Note | You must plan the site before the scheduled delivery of the system because installation of a CRS 8-slot LCC may require space, floor loading, power, and cooling modifications to a facility. |
Carrier Routing System (CRS) replaces much of the equipment in service provider points of presence (POPs) today. The routing systems are built around a scalable, distributed three-stage switch fabric and a variety of line card (packet) interfaces. These packet interfaces are located on modular services cards (MSCs) or forwarding processors (FP) and their associated physical layer interface modules (PLIMs), which are effectively cross-connected to each other through the switch fabric.
CRS 8-slot LCC is a half-height, rack-mounted 8-slot version of the 16-slot chassis. It is a highly scalable routing system that provides 6.4 terabits per second (Tbps) of routing capacity and supports up to 8 MSCs or FPs (A terabit is 1 x 1012 bits or 1,000 Gigabits). The chassis installs in a 19-inch equipment rack.
CRS 8-slot LCC can be installed in collocation facilities, data centers, and many Tier II and Tier III locations. The routing system consists of a single rack-mounted chassis that contains the following system components:
CRS 8-slot LCC has its own power and cooling sub-systems. Two types of power systems are available: fixed or modular configuration. Both power configurations use either AC or DC power.
CRS 8-slot LCC supports 40G, 140G, and 200G fabric cards, as follows:
A mixture of 40G, 140G, and 200G fabric cards is not supported except during migration.
Note | Throughout this document, the term Cisco CRS Carrier Routing system refers to Cisco CRS-1, Cisco CRS-3, and Cisco CRS-X Carrier Routing Systems, unless otherwise specified. |
Cisco CRS 8-slot LCC is the main component of Cisco CRS. The chassis is a mechanical enclosure that contains a chassis mid-plane. The mid-plane holds the system Modular Services Cards (MSCs), Forwarding Processor (FP) cards, their associated Physical Layer Interface Modules (PLIM), and Switch Fabric Cards (SFCs). Cisco CRS 8-slot LCC contains its own power system; either fixed or modular configuration (see Chassis Power System). The chassis is mounted on a 19-inch equipment rack (see Equipment Rack Considerations).
This section describes the main components of Cisco CRS 8-slot LCC that are considered Field-Replaceable Units (FRUs), but where additional detail is useful, the section identifies sub-assemblies that are not field-replaceable.
The following figure shows the front view of Cisco CRS 8-slot LCC with a fixed configuration AC power system installed. The front view of a Cisco CRS 8-slot LCC with a fixed configuration DC power system installed is similar to this figure.
1 |
Cable management bracket |
4 |
Air filter |
2 |
Chassis vertical mounting brackets |
5 |
Power system |
3 |
PLIM and RP slots (RPs in middle 2 slots) |
|
|
The following figure shows the rear view of a Cisco CRS 8-slot LCC with an AC and a DC fixed configuration power supply installed.
The following figure shows the front view of a Cisco CRS 8-slot LCC with an AC and a DC modular configuration power supply installed.
The following figure shows the rear view of a Cisco CRS 8-slot LCC with an AC and a DC modular configuration power supply installed.
The following figure shows the rear view of a Cisco CRS 8-slot line card chassis with a fixed configuration AC power system installed.
1 |
Upper fan tray (beneath cover) |
5 |
Lower fan tray |
2 |
Chassis vertical mounting brackets |
6 |
Cooling air outlet screen |
3 |
Switch fabric card (half-height) slots |
7 |
Power distribution units (PDUs) |
4 |
MSC slots |
|
|
Cisco CRS 8-slot LCC contains the following components:
Each MSC or FP can be associated with several different PLIMs, which provide different interface speeds and technologies. Some of the available PLIMs are:
Note | For a complete list of available PLIMs, consult your Cisco sales representative or visit http://www.cisco.com. |
The RP also monitors system alarms and controls the system fans. LEDS on the front panel indicate active alarm conditions.
A Performance Route Processor (PRP) is also available for the Cisco CRS 8-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 switch fabric receives user data from one MSC (or FP) and PLIM pair and performs the switching necessary to route the data to the appropriate egress MSC (or FP) and PLIM pair. The switch fabric is divided into eight planes that evenly distribute the traffic across the switch fabric. Each switch fabric card implements two planes of the switch fabric.
The PLIM side of the chassis is considered the front of the chassis, where user data cables attach to the PLIMs and cool air enters the chassis. The MSC side, which is where warm air is exhausted, is considered the rear of the chassis.
This section identifies the location and slot numbers for major cards and modules (primarily the field-replaceable units) that plug into the chassis.
The following figure shows the slot numbers on the front (PLIM) side of the Cisco CRS 8-slot line card chassis.
As shown, the front (PLIM) side of the chassis has the following card slots:
The following figure shows the slot numbers on the rear (MSC) of the chassis.
The rear (MSC) side of the chassis has the following card slots:
The MSC slot numbers are reversed from the PLIM slot numbers on the other side of the chassis. Because an MSC mates with its associated PLIM through the midplane, MSC slot 0 is on the far right side of the chassis looking at it from the rear (MSC) side.
PLIM slot 0 is on the far left side of the chassis, looking at if from the front (PLIM) side. MSC slot 0 and PLIM slot 0 mate with each other through the midplane, and so do all other MSC and PLIM slots (0 through 7).
The table lists the sequence of tasks to perform as you plan the installation of the routing system. Use the table as a checklist for all aspects of the installation. For information about a particular task, see the appropriate section of this site planning guide. After completing the checklist, you should consult your Cisco installation coordinator for a site-readiness inspection.
Site Planning Steps |
See |
Check |
---|---|---|
Determine where to install the routing system and make sure that you have the appropriate installation and configuration tools. |
|
|
Consider equipment arrival, storage, and transport to the installation site. |
|
|
Make sure that the equipment rack meets the installation requirements. |
|
|
Consider the space where the routing system will be installed. |
|
|
Plan for power (fixed or modular configuration power, AC or DC). |
|
|
Consider cooling and airflow requirements. |
|
|
Consider cable management. |
|
|
Consider Cisco installation services. |
|