8-Port 10-Ge Plim With Xfp Optics Modules - Cisco CRS-1 System Description

Line Cards and Physical Layer Interface Modules Overview
Oversubscription of 10-GE Ports
If more than two optic modules are installed in either set of ports, oversubscription occurs on all ports in that
set. For example, if modules are installed in ports 0 and 1, each interface has 10 Gbps of throughput. Adding
another module in port 2 causes oversubscription on all of the interfaces (0, 1, and 2).
Note If your configuration cannot support oversubscription, do not install more than 4 optic modules in each PLIM,
and do not install more than 2 optic modules in each set of ports: upper (0 to 3) or lower (4 to 7).
10-GE XENPAK PLIM Components
The 8-port 10-GE PLIM consists of:
• Optic modules: Provide receive (RX) and transmit (TX) optical interfaces that comply with IEEE 802.3ae.
The PLIM supports from one to eight pluggable XENPAK optic modules, each providing full-duplex
long-reach (LR) optics with SC fiber-optic interfaces. Note that the PLIM automatically shuts down any
optic module that is not a valid type.
• Physical interface controller: Provides data packet buffering, Layer 2 processing, and multiplexing and
demultiplexing of the 10-GE data streams, including processing for VLANs and back-pressure signals
from the MSC.
• Additional components: Include power and clocking components, voltage and temperature sensors, and
an identification EEPROM that stores initial configuration and PLIM hardware information.
Figure 40: 10-GE XENPAK PLIM Front Panel
Figure 40: 10-GE XENPAK PLIM Front Panel
1 Port LED (one per port)
The 8-port 10-GE XENPAK PLIM has the following components:
• Eight slots that accept XENPAK optic modules, which provide LR optics with SC fiber-optic interfaces.
• A STATUS LED: Green indicates that the PLIM is properly seated and operating correctly. Yellow or
amber indicates a problem with the PLIM. If the LED is off (dark), check that the board is properly seated
and that system power is on.
• An LED for each port: Indicates that the port is logically active; the laser is on.
The 8-port 10-GE XENPAK PLIM power consumption—110 W (with 8 optic modules)

8-Port 10-GE PLIM with XFP Optics Modules

The 8-port 10-GE XFP PLIM supports from one to eight pluggable XFP optics modules. The 8-port 10-GE
XFP PLIM has:
• Eight ports that accept XFP optics modules
• Status LED for the PLIM
2 STATUS LED
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router System Description
shows the front panel of the 10-GE PLIM.
Oversubscription of 10-GE Ports
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