The 16 slots in the Cisco CRS 16-slot Line Card Chassis (LCC) can contain the following:

• Modular services cards (MSCs)
• Forwarding processor (FPs) cards
• Label switch processor (LSP) cards

Note	MSCs, FPs, and LSPs are referred to as line cards.

• Associated physical layer interface modules (PLIMs)
• SPA Interface Processors (SIPs)

Each slot has the capacity of up to 200 gigabits per second (Gbps) ingress and 200 Gbps egress, for a total routing capacity per chassis of 6400 Gbps or 6.4 terabits per second (Tbps). (A terabit is 1 x 1012 bits or 1000 gigabits.)

The LCC supports 40G, 140G, and 400G fabric cards, as follows:

• The Cisco CRS-1 Carrier Routing System uses fabric cards designed for 40 G operation (CRS-16-FC/S or CRS-16-FC/M cards).
• The Cisco CRS-3 Carrier Routing System uses fabric cards designed for 140G operation (CRS-16-FC140/S or CRS-16-FC140/M cards).
• The Cisco CRS-X Carrier Routing System uses fabric cards designed for 200G operation (CRS-16-FC400/S or CRS-16-FC400/M cards in 200G mode).

A mixture of 40G, 140G, and 400G fabric cards is not supported except during migration.

Note	Throughout this document, the generic term Cisco CRS Carrier Routing system refers to the Cisco CRS-1, Cisco CRS-3, and Cisco CRS-X Carrier Routing Systems, unless otherwise specified.

The chassis has an integrated rack and does not require an external rack. The chassis is bolted to the facility floor. It contains its own power and cooling systems. Two types of power systems are available: fixed and modular. Both power configurations use either AC or DC power.

This system description is not a planning, an installation, or a configuration guide.

This section lists the main components of an LCC. It primarily identifies the components considered field-replaceable units (FRUs), but where additional detail is useful identifies subassemblies that are not field replaceable.

The LCC contains:

• Up to 16 line cards, associated PLIMs, and SIPs/SPAs. A line card and a PLIM or SIP/SPA are an associated pair of cards that connect through the chassis midplane. The line card provides the forwarding engine for Layer 3 routing of user data that is switched through the system, and the PLIM or SIP/SPA provides the physical interface and connectors for the user data.

Note	For a complete list of available PLIMs, consult your Cisco sales representative or visit: http://www.cisco.com

• • The MSC card is available in the following versions: CRS-MSC (end-of-sale), CRS-MSC-B, CRS-MSC-140G, and CRS-MSC-X (200G mode).
  • The FP card is available in the following versions: CRS-FP140, CRS-FP-X and CRS-FP-X-L (200G mode).
  • The LSP card is: CRS-LSP.
• Each line card can be associated with different types of PLIMs, which provide different interface speeds and technologies. Note the following:
  • The CRS-MSC-B card is compatible with both 40G CRS-1 and 140G CRS-3 fabric cards.
  • The CRS-MSC-140G card is only compatible with the 140G CRS-3 fabric card.
  • The CRS-MSC-X and CRS-MSC-L card (200G mode) is only compatible with the 400G CRS-X fabric card.
• A chassis midplane. The midplane connects a line card to its associated PLIM. The midplane design allows the line card to be removed from the chassis without having to disconnect the cables that are attached to the associated PLIM. The midplane, which also distributes power, connects the line cards to the switch fabric cards, and provides control plane interconnections, is not field replaceable by the customer.
• Two route processor (RP) cards. The RPs supply the intelligence of the system by functioning as the chassis system controller.

A Performance Route Processor (PRP) card is also available for the Cisco CRS 16-slot line card chassis. The PRPs perform the same functions as 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).

• Two fan controller cards. The cards control the speed of high-speed fans in the fan trays to adjust the airflow for ambient conditions.
• Upper and lower fan trays. The trays push and pull air through the chassis. A removable air filter is located above the lower fan tray.
• Eight switch fabric cards. These fabric cards provide a three-stage Benes switch fabric for the system.
  • As a single-shelf (standalone) system, the line card chassis contains S123 switch fabric cards that provide all three stages of the three-stage Benes switch fabric.
  • As part of a multishelf system, the LCC contains S13 fabric cards that provide stage 1 and stage 3 of the switch fabric. S2 fabric cards in the FCCs provide stage 2 of the fabric, and fabric cables connect the fabric cards to each other.

Caution

The LCC, when installed as part of a multishelf system, supports either 40 G fabric cards (CRS-16-FC/M cards), 140 G fabric cards (CRS-16-FC140/M cards), or 400G fabric cards (CRS-16-FC400/M cards in 200G mode). A LCC with a mix of 40G, 140G, and 400G fabric cards is not a supported mode of operation. Such a mode is allowed temporarily only during the upgrade process.

Caution

The LCC, when installed as a single-shelf (standalone) system, supports either 40G fabric cards (CRS-16-FC/S cards), 140G fabric cards (CRS-16-FC140/S cards), or 400G fabric cards (CRS-16-FC400/S cards). A LCC with a mix of 40G, 140G, and 400G fabric cards is not a supported mode of operation. Such a mode is temporarily allowed only during the upgrade process.

• Two alarm modules. The alarm modules provide external alarm system connections. The alarm modules are located in the AC or DC power shelves.
• Two types of power systems are available: fixed configuration power and modular configuration power. Both power configurations use either AC or DC power. Both Fixed and modular power support redundant power shelves and power modules.

The following figure shows a front view of a Cisco CRS 16-slot line card chassis with an AC fixed configuration power supply. The front view of a Cisco CRS 16-slot line card chassis with a DC fixed configuration power supply is similar.

The following shows the rear view of a Cisco CRS 16-slot line card chassis with an AC and DC fixed configuration power supply.

The following figure shows a front view of a Cisco CRS 16-slot line card chassis with an AC and DC modular configuration power supply.

The following figure shows the rear view of a Cisco CRS 16-slot line card chassis with an AC and DC modular configuration power supply.

Every Cisco CRS 16-slot line card chassis has 16 MSC, FC, or LSP slots, each with a capacity of up to 200 gigabits per second (Gbps) ingress and 200 Gbps egress, for a total routing capacity per chassis of 6400 Gbps or 6.4 terabits per second (Tbps). (A terabit is 1 x 1012 bits or 1000 gigabits.)

The routing system is built around a scalable, distributed three-stage Benes switch fabric and a variety of data interfaces. The data interfaces are contained on PLIMs that mate with an associated line card through the chassis midplane. The switch fabric cross-connects line cards to each other. The following figure is a simple diagram of the basic Cisco CRS routing system architecture.

The figure illustrates the following concepts, which are common to all Cisco CRS routing systems:

• Packet data enters the line card through physical data interfaces located on the associated PLIM. In the figure, these physical interfaces are represented by four OC-192 ports.
• Data is routed through the line card, a Layer 3 forwarding engine, to the three-stage Benes switch fabric. Each line card and its associated PLIM have Layer 1 through Layer 3 functionality, and each line card can deliver line-rate performance (200 Gbps aggregate bandwidth). See Line Cards and Physical Layer Interface Modules for more information.
• The three-stage Benes switch fabric cross-connects the line cards in the routing system. The switch fabric is partitioned into eight planes (plane 0 to plane 7) and is implemented by several components. See Switch Fabric for more information.

The main features of all Cisco CRS Series routing systems include:

• A highly scalable router that provides a routing capacity between 1.28 and 6.4 Tbps.
• A wide range of interface speeds and types (for example, OC-48 packet-over-SONET (POS) and OC-192 POS), and a programmable MSC, FP, or LSP forwarding engine that provides full-featured forwarding at line-rate speeds.
• Redundancy and reliability features allow nonstop operation even during service upgrades of equipment, with no single points of failure in hardware or software.
• Potential for expanding from single-chassis to multichassis (or multishelf) systems.
• Partitioning into logical routers. A logical router (LR) is a set of line cards and route processors (RPs) that form a complete router. More specifically, each LR contains its own instance of dynamic routing, IP stack, SysDB (system database), interface manager, event notification system, and so on.

The Cisco CRS Series 16-slot line card chassis is the mechanical enclosure that contains the system components. The line card chassis is secured to the floor and has a locking front and optional rear doors. The line card chassis is a complete rack enclosed in a cabinet. A single-shelf (standalone) system consists of a single line card chassis only. A multishelf system consists of up to nine line cards and connects up to four switch fabric cards.

This section includes the following topics:

The following table lists the compatibility of 40G CRS, 140G CRS, and 400G CRS fabric, forwarding, and line card components for the CRS 16-slot system.

Note	A router with a mix of 40G, 140G, and 400G fabric cards is not a supported mode of operation. Such a mode is temporarily allowed only during the upgrade process.