System interfaces
25
System functions and features as of R4.1
syd-0570/1.2 – R4.1 – 08.2016
2. 1. 1. 2 Basic rate interfaces BRI-S external
The basic access S external is a BRI-S interface configured as external (setting Pro-
tocol BRI-S) in the interface configuration).
The basic access BRI-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 communication server and routes the call accordingly (e.g.an external fax
server, see also "Direct Dialling Out (DDO)", page 33
).
Fig. 1 BRI-S external in a private leased-line network: PINX-PINX connection
Fig. 2 BRI-S
external in a DDI configuration
Note:
An BRI-S interface configured as external is a fully-fledged network interface and is no longer
available as a user-network interface. A basic access BRI-S
external cannot be used as a con-
nection to the public ISDN network.
PINX 1 PINX 2
BRI-T
BRI-T
S
extern
451
...
455
222 224 51
...
222 224 55
Communi-
cation
server
Device with DDI
evaluation
BRI-TBRI-T
S
external
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