Features
1.3
System Integration
Communication Multiplexers
The four independent serial HDLC communication channels implemented in the IDEC make the
circuit suitable for use in communication multiplexers.
The collision detection/resolution capability of the circuit allows statistical multiplexing of packets in
one or several physical data communication channels, for example in DMI (mode 3) applications.
Centralized Signaling / Data Packet Handlers
The IDEC can be used in central packet handlers of ISDN networks to process signaling or packet
data of four ISDN subscribers. In this application, it may be used with or without the Extended PCM
Interface Controller (EPlC
®
) PEB 2055.
The IDEC can be connected to the IOM interface of the EPIC, which is itself connected to the PCM
system highway. The EPIC implements concentration and time slot assignment functions. As an
alternative, the IDEC may be directly connected to PCM highways (figure
1).
The size (from 1 to 8 bits) and the position of the time slot associated with each HDLC controller is
software programmable. In addition to the receive and transmit data highways, the IDEC accepts a
third input connection for collision detection purposes. The mode of collision detection is
programmable. A "collision highway" (or time slot) can be used for remote collision control, as a
"clear to send" lead, or for local contention resolution among several IDECs.
Semiconductor Group
10
ETC [ ETC ]
