Interfaces and Terminals as of I7.8
12
System Interfaces
sy
d-
023
9/2.
4
– I7.
8
– 0
7
.2009
2. 1. 1. 2
Basic Access S External
The basic access S external is an S interface configured as external (
S-bus protocol =
EXTERNALS
setting in the interface configuration).
The basic access S external is designed for the following purposes:
•
For connection to the private leased-line network or
•
For connecting DSS1 terminal equipment, which evaluates the DDI number sent
by the PBX and routes the call accordingly (e. g. a fax server, see also
Fig. 1
S external in a private leased-line network: PINX-PINX connection
Fig. 2
S external in a DDI configuration
Note:
An S interface configured as external is a fully-fledged network interface
and is no longer available as a user-network interface. A basic access
S external cannot be used as a connection to the public ISDN network.
T
haz0641aaena0
S external
T
PINX 1
PINX 2
S external
T
T
Device with
DDI evaluation
451
...
455
222 224 51
...
222 224 55
haz0704aaena0
PBX