Nortel ISDN Signaling Link Description, Installation And Operation page 45

Figure 7
ITG configuration
LAN
ITG Trunk 2.0 ISDN Signaling Link (ISL)
ISL
Router
ISDN signaling between the Meridian 1 and the ITG ISL Trunk supports the
delivery of Calling Line Identification (CLID) and feature messaging. ISL
DCH signaling provides the necessary signaling connection over which data,
including CLID and feature-specific messaging, can be passed.
Router
IP Network
Router
Description, Installation and Operation
Description Page 45 of 378
D L
M S
ISL
H I P
D C
d e r
L e a
e r
l o w
F o l
LAN
D L
M S
ISL
H I P
D C
d e r
L e a
e r
l o w
F o l
LAN
553-9472