I n s t a l l a t i o n & P r o g r a m m i n g M a n u a l
58
For each SLT extension, the wiring pair must have a maximum DC loop resistance of 900
Ω
. Each
system terminal maximum loop resistance is 200
Ω
under normal conditions (or 50
Ω
under battery
back-up).
All extensions except extension 14 are for internal use only and are not suitable for external use
without additional external lightning protection.
When a SLT or other equipment is connected to the exchange lines, it is not necessary to pause
between seizing the line and dialling out the digits.
Fax /Voice Card
This option card is used to store the various voices messages used in Auto Answer features and
Security alarm applications. The card also has a fax detector, which is used to automatically route fax
calls to the fax machine. The card plugs into the slot shown in Figure 4-6 on page 57. This card is
automatically detected when the telephone system powers up.
V24 / RS-232C Serial Data Interface
The optional V24/RS-232C option board is mounted on dedicated MBU terminals provided for this
purpose. (Refer to Figure 4-6 on page 57 for location details). The board is connected using the RJ11
cable and either a D9 or D25 serial port connector. Before installing the optional board it is necessary
to break out the thin plastic tongue in the moulding to allow the R J11 socket to fit in the side of the
case.
Before connecting SMDR port to the terminal device, check that the transmit (TX), receive (RX) and
ground pins of the terminal device are RS232 compatible to ensure serial data transmission
compatibility. The terminal device can be a Serial ASCII Printer or Computer.
Protocol: 4800Baud, 8 data bits, 1 stop bit, no parity, no flow control
Signal
25 pin D
9 pin D
RJ11 on V24
V24 card
Rx
3
2
4 (black)
3
Tx
2
3
3 (blue)
4
GND
7
5
5 (yellow)
2
DSR
6
6
2 (green)
1
V24 / FSK Card
This optional card is identical to the V24 card above plus it is able to generate CLI information for
analogue extensions from incoming ISDN calls.
CLI and Meter pulse detector card
There are three options for this slot.
Meter pulse detector card
6-line CLI card
Combined CLI and Meter pulse detector card
The meter pulse detector card detects meter pulses which are displayed on the Executive terminal as
either the number of meter pulses or as a call charge for logging to the CDR file.
The CLI and Meter pulse detector card detects meter pulses as described above and detects the
Calling Line Identification (CLI) information. The CLI data is also sent to Executive Terminals and
to the CDR file.
Important!
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