
PEB 80900
Part II
’
IEC-T
’
: General Description
Data Sheet
74
2001-04-02
5.3
Operation Modes and Functions
5.4
The ISDN Telecom IC Family from Siemens
The NTC-T AM with NTC-T functionality selected is designed to operate optimally
together with the other telecom components from Siemens. Each family member fits into
a complete self-sufficient device concept for ISDN systems.
5.4.1
PEB 2070 ISDN Communications Controller (ICC)
Besides switching functions for the 64 kbit/s B channels, D channel protocol handling is
the main task of the microprocessor compatible ICC. Its characteristic features are
determined by a sophisticated on-chip data link access protocol controller on D channel
(LAPD) and a sophisticated FIFO structure. The 16 kbit/s D channel carries signaling
information, telemetry data, and packet-switched data.
5.4.2
PEB 2080 S-Bus Interface Circuit (SBC)
The SBC realizes the four-wire S-interfacing between subscriber terminal and network
termination. The NTC-T AM with NTC-T functionality selected is designed to meet all the
requirements stipulated by CCITT. Moreover, it implements additional features
necessary in specific applications. The device contains transceiver functions, timing
recovery for different modes of operation, circuitry for collision resolution, and a state
control block to handle the activation/deactivation procedure. It also allows up to 8
terminals to be connected to the same network termination.
5.4.3
PEB 2085 ISDN Subscriber Access Controller (ISAC-S)
The ISAC-S, the implementation of the SBC and ICC on one chip, provides a mono chip
solution for interfacing a subscriber terminal to the four-wire S-bus.
5.4.4
PEB 2095 ISDN Burst Transceiver Circuit (IBC)
The IBC solves the problems of data transmission via twisted pair telephone cables (U
interface) in a time compression multiplex method. As an alternative to the NTC-T AM
with NTC-T functionality selected the IOM
compatible device is optimized to the needs
of PABX systems.
5.4.5
PEB 20950 ISDN Subscriber Access Controller (ISAC-P)
The ISAC-P, the implementation of the IBC and ICC on one chip, provides a monochip
solution for the direct access of two-wire terminals In PABX systems.