Atm Network Interface Module - Polycom DOC2237A Hardware Installation Manual

Chapter 4 - Hardware Description

ATM Network Interface Module

4-34
The ATM Network Interface Module provides the interface between the
MGC unit and ATM network. The ATM card may be shipped in two
configurations: ATM-25 Network Interface Module that supports one 25MB
connection using RJ-45 connector and ATM-155 Network Interface Module
that supports one 155MB connection using a fiber optics connector.
The ATM-25 (FVC) Network Interface Module supports up to 10 H.321
endpoints at 2B or 384 Kbps, using First Virtual (FVC) technology.
The ATM-155 (FVC) Network Interface Module supports up to 20 H.321
endpoints at 2B or 384 Kbps, using First Virtual (FVC) technology.
The ATM-25 Network Interface Module is used with the IO-25 card and the
ATM-155 Network Interface Module is used with the IO-155 card.
Figure 4-17 shows the architecture for the ATM Network Interface Module.
The card architecture is identical to both card types.
ATM
ATM Hardware
MVIP
ISA Interface
Front
Panel
Watch
LEDs
Dog
HDLC Interface
Figure 4-18: ATM-25 and ATM-155 Network Interface Module
TDM Interface
ATM-MVIP Card
Card
Manager
Memory