T640 Switch Interface Boards (Sibs) Description; Table 6: Links To The Sibs From The Fpcs - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide

T640 Switch Interface Boards (SIBs) Description

30
The Switch Interface Boards (SIBs) provide the switching function to the destination
FPC (see Figure 16 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" on page 31
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 6: 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)
Type 2 FPC Each FPC has one dedicated ASIC with five high-speed links that
connect to the SIBs (one link per SIB)
Type 3 FPC Each FPC has two dedicated ASICs, and each ASIC has five high-speed
links that connect to the SIBs (a total of 10 links).
Type 4 FPC Each FPC has one dedicated ASIC with ten high-speed links that
connect to the SIBs (two links per SIB).
The T640 router supports these types of SIBs:
Standard SIB.
Standard SIB version B (supported in Junos OS Release 7.3 and later)—Required to
support the Enhanced Scaling FPCs in a standalone T640 router. If you use one or
more Enhanced Scaling FPCs in a T640 router that is not part of a routing matrix, each
31).
—acts as a backup to the remaining four SIBs. If a SIB
SIB4
Table 6 on page
, and —located on the SIB faceplate that display the
FAIL
.
through
SIB0 SIB4
30.
describes
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