Features
PABX (NT2)
CP
S
TE(1)
TE(8)
TE(1)
T
U
LT-S
LT-S
SN
LT-T
NT1
CP = Central
Processor
R
Line
Card
=
ISAC -S
SN = Switching
Network
TE(1)
TE(8)
Direct Subscriber Access
(point-to-point, short and extended
passive Bus)
S
U
NT1
ITS02315
Figure 5
Applications of the ISAC®-S (ISDN Basic Access)
Terminal Applications
The concept of the ISDN basic access is based on two circuit-switched 64 kbit/s B channels
and a message oriented 16 kbit/s D channel for packetized data, signaling and telemetry
information.
Figure 6 shows an example of an integrated multifunctional ISDN-S terminal using the
ISAC-S. The ISAC-S provides the interface to the bus and separates the B and D channels.
The D channel, containing signaling data and packet switched data, is processed by the LAPD
controller contained in the ISAC-S and routed via a parallel µP interface to the terminal
processor. The high level support of the LAPD protocol which is implemented by the ISAC-S
allows the use of a low cost processor in cost sensitive applications.
The IOM-2 interface generated by the ISAC-S is used to connect different voice/data (V/D)
application modules:
– sources/sinks for the D channel
– sources/sinks for the B1 and B2 channels.
Semiconductor Group
26
INFINEON [ Infineon ]
