Aastra Ascotel IntelliGate A150 System Manual page 16

Interfaces and Terminals as of I7.8
Point-to-Point Connection with Direct Dial
With direct dial the individual PBX users can be reached directly via their direct dial
number.
NT1: Network Terminal
DDI: Direct dialling
U/T: ISDN reference point
AD2: digital terminal interface AD2
S: terminal interface S
a/b: Analogue terminal interface
Fig. 6 Several basic accesses in point-to-point configuration, with direct dial number
Note:
Do not connect any terminals between the NT1 and the PBX.
Periodic Reactivation of Layer 2 on the T-Interface
Layer 2 of the T network interface can be reactivated periodically every three min-
utes so that incoming calls are not rejected already at the local exchange after po-
tential temporary interruptions in the U-interface. To do so, configure the parame-
ter L2 reactivation
Note:
In some countries T network interfaces are deactivated once a certain
amount of time has elapsed without traffic, and are only reactivated
when the PBX once again requests a connection.
1)
Only in Germany and Austria.
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of the T network interface to special.
1)
System Interfaces