10.2.7.4. Advanced Criteria for Signaling Survivability 
The restriction and monitoring functions described in Section 2.7.1,
“Restriction of the Available Signaling Bandwidth (Traffic Shaping)”
to Section 2.7.3,
“Monitoring Message Throughput” can trigger the signaling
path switchover from LAN to modem.
The events that should activate signaling survivability are set for
each access point in the course of configuration.
The following options are available:
- Switching over the signaling path to modem in the event of loss of monitoring connection - [STD] In STanDard mode, the signaling path is switched back to LAN as soon as stability returns to the monitoring connection.
- Switching over the signaling path to modem in the event of loss of the monitoring connection or violation of the criteria from monitoring the quality of the signaling connection - [EXTENDED] In EXTENDED mode, the signaling path is switched back to LAN as soon as stability returns to the monitoring connection and the quality criteria are satisfied. To measure the quality criteria, a load is periodically generated on the monitoring connection which must at least be able to transport the signaling connection after reverting to LAN.
IMPORTANT:
When using EXTENDED mode, the bandwidth available must
be taken into consideration on the signaling path over modem. There is
no point in switching to a 28.8-Kbps modem connection because the minimum
throughput for the LAN connection falls short of 64 Kbps.
- Exclusive use of the signaling path on modem - [SURVONLY] SURVONLY mode permits the administrative switchover of the signaling path to modem irrespective of behavior on the LAN connection. This can be used for stable switchover when performing planned maintenance in the LAN/WAN environment for the duration of the maintenance work. Switching back is then performed in STanDard or EXTENDED mode
IMPORTANT:
Even in the case of administrative activation of signaling
survivability for an access point, the establishment of new payload connections
is blocked in the OpenScape 4000 CC (to all HG 3500s).
Generation
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Configuration Management > System Data > IPDA > Access point
Click Search and select the switchover mode for signaling survivability on the
Quality of Service tab in the Signaling Quality of Service section, then
Save.
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CHA-STMIB:MTYPE=NCUI2,TYPE=SIGQOS,LTU=99,SIGPTHSW=EXTENDED; |
The setting becomes effective immediately.