Nortel Networks 1000 - Manual (Page 863)

Functional description 863
•
separate D-channel data from signaling information and route the data
to the packet handler
•
send call control messages to ISDN BRI terminals over the D-channel
Each MISP can support 4 line cards (UILC or SILC or any combination of
the two). Each line card supports 8 DSLs, therefore each MISP supports
32 DSLs. Since each DSL uses two B-channels and one D-channel the
MISP supports 64 B-channels and 32 D-channels. If the MISP is carrying
packet data, it must dedicate one of its D-channels to communicate with
the external packet handler. In this case the MISP supports only 31 DSLs.
The main functions of the MISP are:
•
to communicate with the CPU to report ISDN BRI status and receive
downloaded application software and configuration parameters
• to manage data link layer and network layer signaling that controls call
connection and terminal identification
• to control terminal initialization and addressing
• to assign B-channels for switched voice and data transmission by
communicating with the BRI terminal over the D-channel and allocating
to it an idle B-channel with appropriate bearer capabilities
• to separate D-channel data from signaling information and route the
data to the packet handler
•
to send call control messages to ISDN BRI terminals over the
D-channel
The MISP supports the downloading of ISDN applications from the
Option 11C software daughterboard. The MISP is downloaded with the
appropriate application code:
•
on the first enabling of the MISP card
•
when Option 11C Software is upgraded
• when MISP Applications are added/changed
The applications for the MISP are copied from the software cartridge
into RAM on the MISP card. Only the new/different applications are
downloaded. This information is then copied into the Flash ROM on the
MISP for storage. This process requires approximately 10 minutes to
complete and is carried out while the MISP pack is operational. The next
time the system or MISP card resets, the application is loaded from the
MISP Flash ROM provided there are no new or different applications on
the software cartridge.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.