Primary Rate Interface equipment: overview
Page 15 of 188
ISDN PRI Installation
Note:
The QPC775 Clock Controller is currently available in Canada
only. There can be no mixing of QPC775 and QPC471 in one system.
QPC757 DCHI/NT6D80 MSDL
The QPC757 DCHI or NT6D80 MSDL card is required in all machine types.
Power requirements
The QPC757 DCHI/NT6D80 MSDL power requirements
+5 volts at 3 amperes
+12 volts at 50 milliamperes
–12 volts at 50 milliamperes
Interface to PRI
The QPC757 DCHI connects to the QPC720 PRI via a RS-422 cable. The
following signals are transmitted across the interface:
RCV DATA
RCV CLOCK
XMIT CLOCK
XMIT READY
PRI READY
DCHI READY
PRI READY and DCHI READY are handshake signals.
QPC757/NT6D80 faceplate
The QPC757 DCHI, as shown in
, has one light emitting diode (LED)
to indicate an active or inactive state and two external connectors as follows:
1
Port J1 is a standard asynchronous port in LD 48
Note:
This connection does not support an Add-on Data Module (ADM)
terminal.
2
Port J2 is the D-channel Interface port.
