Specifications

MGX 8220 Service Modules 4-3
Inverse Multiplexer for ATM Trunk Module
The IMATM is a two-card set consisting of a function module front card and a line module back card.
The following front card and line module sets are available:
The shelf may contain one or multiple IMATM card sets in any available service module slot.
1:1 IMATM redundancy is achieved by installing two card sets and a Y-cable.
The IMATM performs no MGX 8220 functions and is solely an extension to the BPX 8620 BNI
card. The BPX 8620 can use up to eight T1 or E1 lines as a trunk (instead of a single T3 or E3 line)
by using an IMATM card in the MGX 8220 shelf.
The IMATM accepts trunk signals from the BPX 8620 BNI over a single T3 or E3 connection and
inverse multiplexes over multiple T1 or E1 lines. The other end of the inversed multiplexed trunk is
another IMATM card in a remote MGX 8220 shelf. (See Figure4-2.)
Figure4-2 IMATM Application
The IMATM can also be used to connect a remote MGX 8220 shelf to a BPX 8620 hub as shown in
Figure4-3.
Front Card: IMATM-8T1
Back Card: RJ48-T3T1
T1 Line interface connector:
T3 Line interface connector:
Miniature RJ-48C
BNC
Front Card: IMATM-8E1
Back Card: RJ48-E3E1
E1 Line interface connector:
E3 Line interface connector:
Miniature RJ-48C
BNC, 75
Front Card: IMATM-8E1
Back Card: SMB-E3E1
E1 Line interface connector:
E3 Line interface connector:
Miniature SMB
Miniature SMB