T640 Switch Interface Boards (Sibs) Description - Juniper T640 Hardware Manual

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T640 Switch Interface Boards (SIBs) Description

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PICs are hot-removable and hot-insertable. You can install up to four PICs in the slots
of each Type 1, 2, and 3 FPC, and one PIC in a Type 4 FPC. Type 1 and Type 2 PICs have
captive screws at their upper and lower corners. Type 3 PICs have an upper ejector handle
and a lower captive screw. Type 4 PICs have an upper ejector handle and a lower ejector
handle.
The router supports various PICs, including ATM, Channelized, Gigabit Ethernet, IP Services,
and SONET/SDH interfaces. Blank PICs resemble other PICs but do not provide any
physical connection or activity. When a slot is not occupied by a PIC, you must insert a
blank PIC to fill the empty slot and ensure proper cooling of the system.
T640 PICs Supported
T640 End-of-Life PICs Supported
The Switch Interface Boards (SIBs) provide the switching function to the destination
FPC (see Figure 16 on page 31).
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.
Each Type 1 FPC and Type 2 FPC has a dedicated ASIC with five high-speed links that
connect to the SIBs (one link per SIB). Each Type 3 FPC has two dedicated ASICs, and
each ASIC has five high-speed links that connect to the SIBs (a total of 10 links). Each
Type 4 FPC has one dedicated ASIC with ten high-speed links that connect to the SIBs
(two links per SIB). One of the five SIBs—usually
four SIBs. If a SIB fails, the backup SIB becomes active and traffic forwarding continues
without any degradation. When the failed SIB is replaced, it becomes the new backup.
The T640 router supports these types of SIBs:
Standard SIB
Standard SIB version B (supported in Junos OS Release 7.3 and later) is 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
SIB in the router must be a SIB version B. All the SIBs in the T640 router can be either
standard SIB or SIB version B. You cannot use both on the same router at the same
time.
through
SIB0
—acts as a backup to the remaining
SIB4
Copyright © 2010, Juniper Networks, Inc.
(top
SIB4