3com MSR 20-20 사용자 설명서

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HAPTER

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NTERFACE

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Step 1: Connect the SMB connector of an E3/T3 cable to the Tx port on the 
FIC-1AT3 and another end to the Rx port on another device.

Step 2: Connect the SMB connector of another E3/T3 cable to the Rx port on the 
FIC-1AT3 and another end to the Tx port on another device.

Step 3: Check the behavior of the LINK LED on the FIC-1AT3 panel: OFF means 
fault occurs on the line and the signal is out of synchronization. Check the line 
status.

Three ATM fiber interface card options are available with your router:

■

1-port ATM 155 Mbps multi-mode fiber interface card (FIC-1ATM-OC3MM)

■

1-port ATM 155 Mbps single-mode fiber interface card (FIC-1ATM-OC3SM)

■

1-port ATM 155 Mbps single-mode long-haul fiber interface card 
(FIC-1ATM-OC3SML)

They provide the following functions:

■

Two frame formats: SDH STM-1 and SONET OC-3.

■

Scrambling in data transmission.

■

Line clock (when working as DTE interface), and internal clock (when working 
as DCE interface)

■

Three test measures: local cell loopback, local payload loopback and remote 
loopback.

n

The following table describes the interface attributes of the ATM cards.

Table 133   Interface attributes of the ATM cards

Fiber-optic connector

SC 

Number of connectors

1 

Interface standard

SONET OC-3/SDH STM-1 

Interface rate

155 Mbps