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Using the Passport 8683POS Module
Chapter 1
About the Passport 8683POS Module
The Passport 8683POS Module provides network transmission using packet over
Synchronous Optical Network (SONET) services. The Passport 8683POS Module
for the Passport 8600 series routing switches provides WAN support to the
Passport product line by allowing access to SONET services in the metropolitan
area. Where multiple campuses exist in a single metropolitan area, you can
connect these campuses without compromising performance or increasing
complexity.
The Passport 8683POS Module is a baseboard with slots for three of the following
two optional media dependent adapters (MDAs):
• 1-port OC-12c/STM-4: single-mode fiber (SMF) or multimode fiber (MMF)
using SONET/SDH
• 2-port OC-3c/STM-1: SMF or MMF using SONET/SDH
The Passport 8683POS Module supports up to six input/output (I/O) OC-3c/
STM-1 lines and up to three I/O OC-12 lines. You can mix these MDAs on a
single Passport 8683POS Module. For example, you can put an OC-12 MDA into
the first slot and OC-3 MDAs into the two remaining slots. For information on OC
lines, PPP, and SONET, refer to Chapter 2, “Using the Passport 8683POS
Module,” on page 29.
You can put more than one Passport 8683POS Module in the Passport 8600 series
chassis, except slots 5 and 6, which are reserved for the Passport 8690 Switch
Fabric (SF) modules. The maximum number of modules on a chassis is four.
One Passport 8690 SF module acts as the CPU for the chassis, and the other
module is the standby CPU, taking over in case of failure. If a CPU failover
occurs, all traffic on the chassis stops momentarily while the standby CPU
reinitializes all input/output modules.