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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 4 Flexible Interface Cards (Router 6000)
4-35
4.11 8.8 Router 1-Port E3 ATM FIC
4.11.1 Introduction
8.8 Router 1-Port E3 ATM FIC, the 1-port 34Mbps ATM-E3 interface card, provides
these functions:
z Two ATM cell mapping modes: ATM direct mapping (ADM) and physical layer
convergence protocol (PLCP).
z Scrambling in data transmission.
z Line clock (when working as DTE interface) and internal clock (when working as
DCE interface).
z Four types of test measures: local cell loopback, local loopback, remote payload
loopback, and remote line loopback.
Note:
You may equip your router with 8.8 Router 1-Port E3 ATM FIC cards to its full capacity. Yet, you are
recommended to install only one 8.8 Router 1-Port E3 ATM FIC on it, whatever its model is, to ensure
performance of some key services.
4.11.2 Interface Attributes
The following table describes the interface attributes of the 8.8 Router 1-Port E3 ATM
FIC.
Table 4-23 Interface attributes of the 8.8 Router 1-Port E3 ATM FIC
Attribute 8.8 Router 1-Port E3 ATM FIC
Connector SMB
Number of connectors
2
Interface standard
G.703, G.751, G.832, G.823
Interface rate
34.368 Mbps
Interface cable
E3/T3 cable (75-ohm coaxial cables)
Supported services
ATM traffic CBR (constant bit rate), rt_VBR (variable bit rate-real
time), nrt_VBR (variable bit rate-non real time), UBR (unspecified
bit rate)