Tadiran Telecom Coral IPx 800 Series, Installation Procedure And Hardware Reference Manual

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Common Control Cards
8-19
HDC C
a
rd
Hig
h
Den
sity Con
tr
o
l
8
8.9
HDC Card
High Density Control
3
The HDC (High Density Control circuit) card for Coral IPx 800 systems serves as a
communication link between the MEX-IP2 and peripheral cards. It contains:
„
Digital tone generators (dial, busy, ringing, ringback, DTMF, MFC, and test)
„
High-Level Data Link Control (HDLC) bus drive circuitry
„
Pulse Code Modulation (PCM) bus drive circuitry
„
Clock circuitry to synchronize the Coral peripheral clock to an external clock
derived from a digital trunk interface such as the 2DT, UDT, T1, 30T, 30T/x, PRI-23,
PRI-30, 4TBR, or 8TBR card.
„
512 x 512 Time Slot Switch circuitry, as in the 4GC card.
Figure 8-4
on page
8-25
illustrates the HDC card layout.
Figure 8-1 Coral
IPx 800, HDC and
Peripheral Cards
1 General Information
Do not insert or remove the HDC card when power is on. Removing the HDC card from
the system while the power is on will cause the system to crash. Inserting the HDC card
while the power is on will prevent the peripheral cards from initializing properly.
MEX-IP2
HDC
PX
Common Control Cards
Peripheral Cards
IPx 800X
1st xpansion cage e
IPx 800X
xpansion cage 2nd e
IPx 800M
main cage