Technical Description of TANDBERG 8000 with software version E3/B8
D12008 Rev. 11
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4.1.1
PRI E1/T1 ISDN & Leased Line E1/T1 Interface
The main RJ-45 jack supports bit rates from 56 kpbs up to 2 Mbps (1.5 Mbps PRI/T1) and may
be used as a PRI E1/T1 interface or a Leased Line E1/T1 interface. Port number 2 is designed
for cascading features when PRI is used.
4.1.1.1
PRI E1/T1 ISDN
Both the Intelligent Call Management (ch. 4.1.6) and the call status are implemented for PRI.
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 Codec to the CSU or last
repeater.
A CSU should not be required if the system is within 200 m (655 ft) of the last repeater
depending on the PRI cable quality.
The TANDBERG 8000 supports the PRI protocols AT&T Custom, National ISDN and ETSI
(Euro ISDN). 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
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DMS250 (Nortel)
National ISDN
DMS100 (Nortel)
National ISDN
(any
switch)
ETSI
(Euro
ISDN)
When booting up with PRI selected, the boot-up text will display ‘Waiting for network
activation’. The boot-up text will not be removed until the PRI line is active or a remote control
button is pressed.
Several TANDBERG 8000 (i.e. 6000 codecs) can be connected to the second PRI port on the
TANDBERG 8000 by cascading. Calling systems on the same PRI port is easily done through
MSN.
Channel hunting
is provided for outgoing calls, this feature is normally used when the number
of channels needs to be specified and when a National ISDN PRI is used with a non-
TANDBERG PRI unit in the cascading chain. The channels outside low and high can then be
reserved by other devices. 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.
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Dependent on the configuration of the switch
