TANDBERG D50104-15 用户手册
Health Care System III
77
Advanced Use
Channel Hunting
Below is a list of common ISDN-PRI/T1 switches.
Type
Manufacturer
PRI Switch Type setting
ATT 4 ESS
AT&T
AT&T ISDN
ATT 5 ESS
AT&T/Lucent
AT&T ISDN or National ISDN*
DMS 100
Northern Telecom
National ISDN
DMS 250
Northern Telecom
National ISDN
* Settings will depend on configuration of the switch. PRI Switch Type is not changed when Restoring Defaults.
Channel hunting is normally used in conjunction with PRI daisy-chaining
with TANDBERG units in the daisy-chain. If only TANDBERG units are
used in the daisy-chain, default setting should be used, as these units will find
available B-channels automatically.
with TANDBERG units in the daisy-chain. If only TANDBERG units are
used in the daisy-chain, default setting should be used, as these units will find
available B-channels automatically.
Max Channels may be used for PRIs that are provisioned for a lower number
of channels.
of channels.
Max Channels may be used as mechanism to ensure that there is bandwidth
available to codecs further down the chain when Daisy-Chaining.
available to codecs further down the chain when Daisy-Chaining.
‘High Channel’, ‘Low Channel’ and ‘Search’ may be used for PRIs
provisioned with specific requirements for B-channel usage.
provisioned with specific requirements for B-channel usage.
Max Channels
Maximum number of channels the unit may use at any given time.
Low Channel
The lowest numbered B-channel that may be used by the unit when selecting channels
for outgoing calls.
for outgoing calls.
High Channel
The highest numbered B-channel that may be used by the unit when selecting channels
for outgoing calls.
for outgoing calls.
Search
Specifies where the system will start searching for available B-channels for outgoing calls.
Codec 1
Low Channel: 10
High Channel: 20
High Channel: 20
Max Channel: 6
PRI 1
PRI 2
PRI 2
Codec 2
or
PBX
or
PBX
Channels: 1-9
will be available for
the codec/PBX
will be available for
the codec/PBX
PRI line
In this example, the unit will start searching for available B-channels at channel 20, because ‘Search’ is set to
‘High’ and ‘High Channel’ is set to 20. The unit will not search for channels below 10, because ‘Low
Channel’ is set to 10. Furthermore if the user tries to make an 8 channel call, the call will be established with
6 channel, because ‘Max Channels’ is set to 6.
‘High’ and ‘High Channel’ is set to 20. The unit will not search for channels below 10, because ‘Low
Channel’ is set to 10. Furthermore if the user tries to make an 8 channel call, the call will be established with
6 channel, because ‘Max Channels’ is set to 6.