CHAPTER23 Digital PSTN
Mediant 1000 Gateway & E-SBC | User's Manual
ISDNIBehavior = 512 ;The parameter should be added because of ;ISDNNFASInterfaceID
coniguration above
NFASGroupNumber_0 = 1
NFASGroupNumber_1 = 1
NFASGroupNumber_2 = 1
NFASGroupNumber_3 = 1
DchConfig_0 = 0 ;Primary T1 trunk
DchConfig_1 = 2 ;B-Channel NFAS trunk
DchConfig_2 = 2 ;B-Channel NFAS trunk
DchConfig_3 = 2 ;B-channel NFAS trunk
Creating an NFAS-Related Trunk Configuration
The procedures for creating and deleting an NFAS group must be performed in the correct order, as
described below.
➢ To create an NFAS Group:
1. If there’s a backup (‘secondary’) trunk for this group, it must be configured first.
2. Configure the primary trunk before configuring any NFAS (‘slave’) trunk.
3. Configure NFAS (‘slave’) trunks.
➢ To stop / delete an NFAS Group:
1. Stop or delete (by setting ProtocolType to 0, i.e., 'None') all NFAS (‘slave’) trunks.
2. Stop or delete (by setting ProtocolType to 0, i.e., 'None') the backup trunk if a backup trunk
exists.
3. Stop or delete (by setting ProtocolType to 0, i.e., 'None') the primary trunk.
● All trunks in the group must be configured with the same values for trunk
parameters TerminationSide, ProtocolType, FramingMethod, and LineCode.
● After stopping or deleting the backup trunk, delete the group and then reconfigure it.
Performing Manual D-Channel Switchover in NFAS Group
If an NFAS group is configured with two D-channels (Primary and Backup), you can do a manual
switchover between these D-channels.
➢ To manually switchover from active to standby D-channel:
1. Open the NFAS Group & D-Channel Status page (Monitor menu > PSTN Status tab > NFAS
Group & D-Channel Status).
2. Select the required NFAS group, and then click the Switch Activity button.
● The Switch Activity button is unavailable (i.e, grayed out) if a switchover cannot
be done due to, for example, alarms or unsuitable states.
● This feature is applicable only to T1 ISDN protocols supporting NFAS, and only if
the NFAS group is configured with two D-channels.
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