Switch Fabric Components And Descriptions; T640 Switch Interface Boards (Sibs) Description; Table 63: Links To The Sibs From The Fpcs - Juniper T640 Hardware Manual

CHAPTER 8
Switch Fabric Components and
Descriptions

T640 Switch Interface Boards (SIBs) Description

Copyright © 2017, Juniper Networks, Inc.
T640 Switch Interface Boards (SIBs) Description on page 111
The Switch Interface Boards (SIBs) provide the switching function to the destination
FPC (see Figure 49 on page
The SIBs create the switch fabric for the router, providing up to a total of 640 million
packets per second (Mpps) of forwarding. Five SIBs are installed in the router. The SIBs
are located at the center rear of the chassis in the slots labeled
to bottom).
SIBs are hot-insertable and hot-removable.
One of the five SIBs—usually
fails, the backup SIB becomes active and traffic forwarding continues without any
degradation. When the failed SIB is replaced, it becomes the new backup.
Each SIB consists of the following components:
Switch Fabric ASICs.
High-speed links (HSLs) to each FPC. See
Three LEDs— ,
ACTIVE OK
status of the SIB. T640 Switch Interface Boards (SIBs) LEDs describes the functions of
the SIB LEDs.
SIB online/offline button, located on the SIB faceplate.
Each T640-SIB also has a fiber-optic adapter for connection to a TX Matrix router. See
the TX Matrix Router Hardware Guide.

Table 63: Links to the SIBs From the FPCs

FPC Type Links to SIBs
Type 1 FPC Each FPC has one dedicated ASIC with five high-speed links that
connect to the SIBs (one link per SIB)
112).
SIB4 —acts as a backup to the remaining four SIBs. If a SIB
Table 63 on page
, and —located on the SIB faceplate that display the
FAIL
SIB0 through SIB4 (top
111.
111