Nortel Networks NN43001-563 - Manual (Page 42)

42 System description
Figure 5
IP Trunk 3.01 (and later) architecture
The ISL connection to the Meridian 1/CS 1000M functions as it does in a
normal ISDN network. The ISL controls the call processing for calls over
analog ISDN Signaling Link (ISL) TIE trunks. With IP Trunk 3.01 (and later),
these ISL TIE trunks are located on the IP trunk cards. The IP Trunk 3.01
(and later) D-channel only controls IP trunk cards in the same IP Trunk
3.01 (and later) node. TM 3.1 administration relates the cards with trunks
to the DCHIP IP trunk card.
The IP trunk card uses ISDN messages for call control and communicates
with the Meridian 1/CS 1000M through the PC Card, using the RS-422 link.
On the Meridian 1, the MSDL provides the ISL DCH interface. The DCHIP
IP trunk card software performs the tandeming of DCH call control to the
H.323 protocol.
Each DCHIP trunk card can be associated with up to 382 trunks. The trunks
reside on all IP Trunk 3.01 (and later) IP trunk cards (ITG-Pentium 24-port
trunk cards and Media Card 32-port trunk cards) in the node. This creates a
functional grouping of IP trunk cards with the DCHIP trunk card providing
the DCH connectivity. If more than 382 trunks are required, additional
DCHIP trunk card groups are configured, each with a maximum of 382
related trunks. See
Figure 6 "Leader, DCHIP, and trunks in an IP Trunk 3.01
(and later) node" (page 43) .
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.