3Com Router Module Guide
Chapter 4
4-38
4.10 ROUTER 1-PORT OC-3 ATM MM FIC/ROUTER 1-PORT
OC-3 ATM SM FIC/ ROUTER 1-PORT OC-3 ATM SML FIC
4.10.1 Introduction
Three ATM fiber interface card options are available with your router:
z
1-port ATM 155 Mbps multi-mode fiber interface card (ROUTER 1-PORT OC-3
ATM MM FIC)
z
1-port ATM 155 Mbps single-mode fiber interface card (ROUTER 1-PORT OC-3
ATM SM FIC)
z
1-port ATM 155 Mbps single-mode long-haul fiber interface card (ROUTER
1-PORT OC-3 ATM SML FIC)
They provide the following functions:
z
Two frame formats: SDH STM-1 and SONET OC-3.
z
Scrambling in data transmission.
z
Line clock (when working as DTE interface), and internal clock (when working as
DCE interface)
z
Three test measures: local cell loopback, local payload loopback and remote
loopback.
4.10.2 Interface Attributes
The following table describes the interface attributes of the ATM cards.
Table 4-23
Interface attributes of the ATM cards
Attribute
ROUTER 1-PORT OC-3
ATM MM FIC
ROUTER 1-PORT OC-3
ATM SM FIC
ROUTER 1-PORT OC-3
ATM SML FIC
Fiber-optic
connector
SC
Number of
connectors
1
Interface
standard
SONET OC-3/SDH STM-1
Interface rate
155 Mbps