Technical Description of TANDBERG MCU with software version D3
D12925 Rev. 03
9
4.1.3.2 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 MCU 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 MCU 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. The 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.
Pinout of PRI E1/T1 Interface:
4
NOTE: TANDBERG recommends always using category 5 cabling.
3
Dependent on the configuration of the switch
4 The cable of use should be a straight through configuration.
PRI Pinout
1 TIP
RX
2 RING
RX
4 RING
TX
5 TIP
TX