System interfaces
21
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
2. 1 Network Interfaces
The system supports the following types of network interfaces:
• Basic rate interface BRI-T for connection to
– the public ISDN network
– the private leased-line network
• Basic access S
external for connection to
– the private leased-line network
– a terminal with its own direct dialling plan (DDO)
• Primary rate access PRI for connection to
– the public ISDN network
– the private leased-line network
• SIP access via the Ethernet interface on the basic system for connection to SIP
provider.
• Analogue network interface for connection to the public analogue network
2. 1. 1 Basic Access Variants
A basic access is a digital network interface for connection to the public network or
to the private leased-line network. It can be set for the protocols DSS1 (public ISDN
network) and QSIG / PSS1 (private leased-line network).
A basic access has two 64 kbit/s user information channels and one 16 kbit/s con-
trol and signalling channel (2B+D).
One call or data connection can be set up on each bearer channel (B channel) si-
multaneously and independently of the other B channel.
A basic access can be barred for outgoing calls (Outgoing Calls Barred setting).
Basic accesses for connecting the communication server to the public network can
be operated as point-to-point and, with some network providers, also as point-to-
multipoint (multiple subscriber number) access.
There are two types of basic access:
• Basic rate interface BRI-T
• Basic access S
external
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