Tadiran Telecom Coral IPx Office, Installation And Hardware Reference Manual, Page: 270 / 510

8-10
Common Control Cards Coral IPx Office Installation Manual
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The group controller embedded circuit serves as the communication link in the Coral
IPx Office system, between the MCB Office and the peripheral cards via the MBP
Office backplane.
The group controller circuit contains the High-Level Data Link Control (HDLC) bus
interface circuitry, Pulse Code Modulation (PCM) bus interface circuitry, clock
circuitry to synchronize the peripheral section of the system, and digital tone
generators (dial, busy, ringing, ringback, DTMF, MFC, and test). Additionally, the
group controller contains circuitry to synchronize the Coral peripheral clock to an
external clock derived from a digital trunk interface. The group controller circuit
supports two HDLC highways and sixteen PCM streams (including one stream
reserved for the MRC), and up to two expansion cages. It is capable of establishing a
maximum of time slots on its maximum peripheral shelf capacity. This matrix allows
for a Constant Frame Delay operation mode.
The time slot distribution is described in
Figure 8-5 .
Voice Switching and Time Slot Configuration
The group controller supports up to two HDLC highways, 16 PCM streams, and up to
two expansion cages.
Each PCM stream includes 64 Time Slots. Each shelf unit (one or two expansion units)
receives Time Slots, divided into groups of 128 Time Slots.
Figure 8-5 .
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1 Group Controller Circuit