Version 6.6 261 Mediant 2000
User's Manual 21. Digital PSTN
21 Digital PSTN
This section describes the configuration of the public switched telephone network (PSTN)
related parameters.
21.1 Configuring Trunk Settings
The Trunk Settings page allows you to configure the device's trunks. This includes
selecting the PSTN protocol and configuring related parameters. This page also provides
the following features:
Taking a Trunk Out of Service: Some parameters can be configured when the trunk
is in service, while others require you to take the trunk out of service. This is done by
clicking the Stop button. Once you have "stopped" a trunk, all current calls are
dropped and no new calls can be made on the trunk.
Deactivating a Trunk: You can deactivate a trunk for maintenance. This is done by
clicking the Deactivate button. Deactivation temporarily disconnects
(logically) the trunk from the PSTN network. Upon trunk deactivation, the device
generates an AIS alarm on the trunk to the far-end. As a result, an RAI alarm signal
may be received by the device. A subsequent trunk activation, done by clicking the
Activate button, reconnects the trunk to the PSTN network and clears
the AIS alarm. Trunk deactivation is typically used for maintenance such as checking
the trunk's physical integrity.
Creating a Loopback Line: You can create (and remove) remote loopback for DS1
lines. This is done by clicking the Create Loopback button. To
remove the loopback, click the Remove Loopback button.
Notes:
• To delete a previously configured trunk, set the 'Protocol Type' parameter to
NONE.
• For a description of the trunk parameters, see 'PSTN Parameters' on page 619.
• During trunk deactivation, you cannot configure trunks.
• You cannot activate or deactivate a stopped trunk.
• If the trunk can’t be stopped because it provides the device’s clock (assuming the
device is synchronized with the E1/T1 clock), assign a different E1/T1 trunk to
provide the device’s clock or enable ‘TDM Bus PSTN Auto Clock’ in the TDM Bus
Settings page (see 'TDM and Timing' on page 263).
• If the ‘Protocol Type’ parameter is set to NONE (i.e., no protocol type is selected)
and no other trunks have been configured, after selecting a PRI protocol type you
must reset the device.
• The displayed parameters depend on the protocol selected.
• All PRI trunks of the device must be of the same line type (i.e., E1 or T1).
However, different variants of the same line type can be configured on different
trunks, for example, E1 Euro ISDN and E1 CAS (subject to the constraints in the
device's Release Notes).
• If the protocol type is CAS, you can assign or modify a dial plan (in the 'Dial Plan'
field) and perform this without stopping the trunk.
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