ASCOM Ascotel 2025 System Manual page 72

Point-to-Point Connection with Direct Dial
With direct dial the individual PBX subscribers can be reached directly via their
direct dial number.
NT1: Network Terminal
SLG: Subscriber Line Group
DDI: Direct dialling
U/T: ISDN reference point
AD2: Digital user-network interface AD2
S: User-network interface S
a/b: Analogue user-network interface
Fig. 1.8: 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
Layer 2 of the T interface can be reactivated periodically every three minutes so
that incoming calls are not rejected already at the local exchange after potential
temporary interruptions in the U connection. For this configure the "L2 reactiva-
tion" feature of the T network interface to "special".
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)
Germany and Austria only
HBT_20321104_01/B0_en
SLG with
DD No.
DDI
403 20 00
U
U
403 20 99
U
1)
ascom
NT1
T
PBX
NT1
T
NT1
T
haz0321aaena1
Ascotel 2025/2045/2065
AD2
S
a/b
System Interfaces 1.17