ASCOM Ascotel 2025 System Manual page 67

ascom Ascotel 2025/2045/2065
3.1 Network Interfaces
The system supports the following types of network interfaces:
• Basic access 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 T2 for connection to
– the public ISDN network
– the private leased-line network
• Analogue network interface for connection to the public analogue network
3.1.1 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)
simultaneously 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 PBX 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 access T
• Basic access S external
1.12 System Interfaces HBT_20321104_01/B0_en