Tadiran Telecom Coral IPx 500, Installation Manual, Page: 445 / 544

Shared Service Ports
9-17
IPx 50
0M Ba
ckpla
ne Main
Service Boar
d i
n
side t
h
e IPx 50
0M Cag
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9
Using Time Slots
A call between two ports requires one transmit and one receive time slot on a single
peripheral highway. Therefore, the HDC circuitry is capable of establishing a call
between 64 ports on each of the eight peripheral highways to any other 64 ports, with
a maximum of 384 simultaneously busy ports, using the six of the eight peripheral
highways.
The HDC 512 x 512 time switch interfaces with the Coral IPx 500 cabinet with eight
receive and eight transmit PCM highways. Each PCM highway carries 64 Time Slots.
The total number of Time Slots for the Coral IPx 500 is 512 for Receive and 512
Transmit PCM highways. The Coral backplane, is designed to have two Receive and
two Transmit PCM highways for every four (card) slots.
Figure 9-4
illustrates the distribution of PCM highways in Coral IPx 500 systems. Each
pair of PCM highways support a different groups of four peripheral cards. Each
Coral IPx 500 system (main cage and two expansion cages together) supports up to 384
ports in simultaneous use.
Clock and Sync Generator
The Clock signal is strobed at 4.096 MHz to identify the bit period of the HDLC and
PCM buses. The Sync signal is strobed at 8.0 KHz, appearing once every 125mS to
identify the start of timeslot 0 on each of the two PCM buses.