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Ascotel 2025/2045/2065
3.1.2
Primary Rate Access T2
A primary rate access is a digital network interface for connection to the public
network or the private leased-line network. It can be set for the protocols DSS1
(public ISDN network) and QSIG / PSS1 (private leased-line network).
A primary rate access has thirty 64 kbit/s user information channels and one
64 kbit/s control and signalling channel (30B+D). One call or data connection can
be set up on each bearer channel (B channel) simultaneously and independently
of the other B channel.
Note:
Primary rate accesses can only be used as point-to-point connections.
NT1:
Network Terminal
U2/U/T2/T:ISDN reference points
30B+D:
Primary rate access channels
2B+D:
Basic access channels
AD2:
Digital user-network interface AD2
S:
User-network interface S
a/b:
Analogue user-network interface a/b
Fig. 1.9:
System with basic and primary rate accesses
Fig. 1.10:
Primary rate access in a private leased-line network: PINX-PINX connection
1.18
System Interfaces
Channels
30B+D
NT1
U2
2B+D
NT1
U
2B+D
NT1
U
T2
T2
PBX
T
T
haz0323aaena1
T2
T2
PINX 1
AD2
S
a/b
PINX 2
haz0705aaxxa0
HBT_20321104_01/B0_en
- Quick Links:
- Expansion Cards and Modules
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