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Description
553-3001-202 Standard 1.00 April 2000
ISDN Signaling Link
ISDN Signaling Link (ISL) provides the capability of replacing conventional
analog trunk signaling with out-of-band ISDN D-channel signaling.
The ISL interface makes available the flexibility of using ISDN signaling to
analog facilities. When no PRI exists between two Meridian 1 systems, ISL
operates in dedicated mode. A dedicated point-to-point signaling link is
established between the two Meridian 1 systems. The signaling information
for the selected analog trunks is transported over the ISDN signaling link. The
analog ISL TIE trunks are for user voice transport. If the D-channel link is
down, call control returns to normal in-band analog trunk signaling.
The ITG is similar to the existing ISL configuration where there is a VPN
between Meridian 1 systems. Instead of a one-to-one connection, multiple
switches can be networked through a single ISL interface at each site.
Figure 7 on page 45 shows an ITG ISL Trunk configuration with three
Meridian 1 systems. ITG ISL Trunk simulates an analog facility. The ISL
interface is connected to a DCHIP PC Card which provides ISDN to VoIP
tandeming. All ITG ISL Trunk cards (DCHIP, Leader, and Follower) are
connected through the Embedded Local Area Network (E-LAN). ITG ISL
Trunk cards communicate with remote switches through the IP network.