Nortel ISDN Signaling Link, Description, Installation And Operation

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Description Page 31 of 378
ITG Trunk 2.0 ISDN Signaling Link (ISL) Description, Installation and Operation
Figure 2
ITG architecture
The ISL connection to the Meridian 1 functions as it does in a normal ISDN
network. The ISL controls the call processing for calls over analog ITG IDSN
Signaling Link (ISL) TIE trunks. These ISL TIE trunks can be on any of the
ITG ISL Trunk cards. The ITG ISL D-channel only controls ITG ISL Trunk
cards in the same ITG node. MAT administration relates the cards with trunks
to the DCHIP ITG Trunk card.
The ITG ISL Trunk card uses ISDN messages for call control and
communicates with the Meridian 1 through the PC Card, using the RS-422
link. On the Meridian 1, the MSDL provides the ISL DCH interface. The
DCHIP ITG Trunk card software performs the tandeming of DCH call control
to the H.323 protocol.
ITG
Core Switch
Core Switch
DCH H.323
IP Network
DCHIP + Followers
ITG
Core Switch
ITG
Core Switch
553-9481