System interfaces
29
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
Point-to-Point Connection with Direct Dial
With direct dial the individual communication server users can be reached directly via
their direct dial number.
NT1: Network Terminal
DDI: Direct dialling
U/T: ISDN reference point
DSI: Digital user-network interfaces
BRI-S: ISDN terminal interface
FXS: Analogue terminal interface
Fig. 6 Several basic accesses with line group in point-to-point configuration, with direct dial number
Note:
Do not connect any terminals between the NT1 and the communication server.
Periodic Reactivation of Layer 2 on the BRI-T Interface
1)
Layer 2 of the BRI-T network interface can be reactivated periodically every three min-
utes so that incoming calls are not rejected already at the local exchange after poten-
tial temporary interruptions in the U interface. To do so, set the parameter Layer2
activation of the BRI-T network interface to Special.
Note:
In some countries BRI-T network interfaces are deactivated once a certain amount of time has
elapsed without traffic, and are only reactivated when the communication server once again
requests a connection.
1)Only in Germany and Austria.
FXS
BRI-S
DSI
U
U
U
403 20 99
403 20 00
NT1
NT1
NT1
Commu-
nication
server
BRI-T
BRI-T
BRI-T
Line group
with DDI
DDI No.
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