System interfaces
22
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
2. 1. 1. 1 Basic rate interface BRI-T
Basic access T is suitable for connection to both the public ISDN network and the
private-leased-line network.
2. 1. 1. 2 BRI-S basic rate interface external
The basic access S external is an BRI-S interface configured as external (S-bus proto-
col = 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 communication server and routes the call accordingly (e.g. an external fax
server, see also "Direct Dialling Out (DDO)", page 30)
Fig. 1 S external in a private leased-line network: PINX-PINX connection
Fig. 2 S external in a DDI configuration
Note:
An BRI-S interface configured as external is a fully-fledged network inter-
face 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.
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