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Technical Description of TANDBERG Gateway with software version G2
D13192 Rev. 02 7
4.1.2 PRI E1/T1 ISDN
4.1.2.1 ISDN number plan
The TANDBERG Gateway’s PRI lines may use one or more numbers for dial in. If more than
one number is used, the numbers must be consecutive.
4.1.2.2 PRI Trunk Grouping
When using more than one PRI line, the same properties for PRI 1 can be used for all PRI's by
defining them all as a trunk group.
4.1.2.3 PRI E1/T1 ISDN
The PRI interface may require an external CSU depending on the network layout. ‘Cable
Length’ in the PRI set-up menu specifies the distance from the TANDBERG Gateway to the
CSU or last repeater.
A CSU is not required if the system is within 200 m (655 ft) of the last repeater.
The TANDBERG Gateway supports the PRI protocols AT&T Custom, National ISDN and
ETSI (Euro ISDN). The AT&T and National protocols will give a total of (23*4) = 92 channels
while the ETSI protocol will give a total of (30*4) = 120 channels.
Within these protocols the following switches are supported:
Switches
Protocols supported
4ESS (AT&T) AT&T Custom
5ESS (AT&T) AT&T Custom and National ISDN
3
DMS250 (Nortel) National ISDN
DMS100 (Nortel) National ISDN
(Any switch) ETSI (Euro ISDN)
Channel hunting is provided for outgoing calls. This feature is normally used when the number
of channels needs to be specified. When no value is specified for low or high channel, they
default to 1 (low), 23 (high US) and 30 (high Europe). Default search is from high to low.
3
Dependent on the configuration of the switch