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Using the Passport 8683POS Module
Chapter 2
Using the Passport 8683POS Module
A typical application consists of a single Passport 8683POS Module in an
Passport 8600 series switch, but multiple modules are also supported. This chapter
briefly explains how the Passport 8683POS Module operates within the Passport
switch.
A typical network application of the Passport 8683POS Module is a direct
connection between one Passport 8600 series switch with a Passport 8683POS
Module in one campus to an identical module in another Passport 8600 series
switch at another campus connected over a SONET ring. Using this connection,
you achieve an intercampus link through packet over SONET (POS) technology.
This chapter contains the following information:
• “SONET transmission,” next
• “Spanning tree group feature” on page 33
SONET transmission
You can connect the Passport 8683POS Module through a Synchronous Optical
Network (SONET) termination multiplexor to extend the range of the wide area
network (WAN) connections. Or, you can connect the Passport 8683POS Module,
using fiber, directly to a POS interface on another Passport routing switch or on a
traditional router.
The SONET frames received from the WAN contain IP packets encapsulated in
Point-to-Point Protocol (PPP) that are converted by the Passport 8683POS
Module into an Ethernet format. Similarly, the Passport 8683POS Module
receives Ethernet frames and converts them into PPP packets for transmission
over SONET.