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Stinger® ADSL 48-Port Annex C LIM Guide
Configuring an ADSL 48-Port Annex C Line Interface Module (LIM)
Configuring call control
Figure 1-3. Future support: How noise margins relate to dynamic rate adaptation
When dynamic rate adaptation is supported, the following parameters will configure it:
[in AL-DMT/{ any-shelf any-slot 0 }:margin-config]
ra-downshift-margin-up = 0
ra-downshift-int-up = 0
ra-downshift-margin-down = 0
ra-downshift-int-down = 0
ra-upshift-margin-up = 0
ra-upshift-int-up = 0
ra-upshift-margin-down = 0
ra-upshift-int-down = 0
Configuring call control
Using call control, you can configure the Stinger to allow connections to be established even
when the line state is not fully up. You configure the unit to use these procedures systemwide
or on a per-port basis on the DS3-ATM, OC3-ATM, and E3-ATM trunk modules and on the
SDSL, ADSL, and SHDSL/HDSL2 LIMs.
The call-control mechanism enables the Stinger unit to establish and maintain soft PVCs
(SPVCs) across port-state changes. This allows xDSL subscribers to establish connections on
LIM interfaces in operating states before the line state is fully up and modem has successfully
trained. SPVC connections are accepted when the modem has not fully trained up to the
port-up state. If a LIM interface with an active SPVC connection changes from a port-up state
to the state it was in before it was fully trained, the SPVC remains connected. Connections are
broken only if the physical slot or line stops operating or is disabled by an administrator.
By default, the Stinger unit monitors the physical line state of its interfaces and allows
connections to be established only when the line state is fully up.
Following are examples of the relevant parameters, shown with default settings:
[in SYSTEM]
ignore-lineup = no
[in SDSL/{ any-shelf any-slot 0 }]
ignore-lineup = system-defined
Reduce output power
ncrease output power
Steady-state operations
Target noise margin
Minimum noise margin
0dB margin
Maximum additional
noise margin
Upshift noise margin
Downshift noise margin
Steady-state operations
Increase bit rate (upshift)
Reduce bit rate (downshift)