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2.4 Installing the Hardware
Once you have determined which board will act as the clock master, and you have selected an I/O address for your AG Connect board as discussed in section
2.3
, you are ready to install the board in your system, connect the board to your telephone lines, and connect external power as described in this section.
2.4.1 Installing the Board In Your System
To install an AG Connect board in your system, follow this procedure:
If necessary, configure the board as described in section
2.3
.
Turn off the computer and disconnect it from the AC power source. Remove the cover and set it aside.
Arrange your boards in adjacent ISA bus slots, in the order you determined in section
2.3.1
.
Make sure each board's ISA bus connector is seated securely in a slot.
Connect an MVIP bus cable to the connectors on your boards, so that each board is positioned on the cable in the location determined in section
2.3.1
.
On the AG Connect board, make sure that pin 1 of the MVIP cable (marked with a colored strip) is on the side of the connector away from the metal end bracket. For best results, the length of the cable and the number of connectors on the cable should not greatly exceed the number of boards connected to it.
As you insert the MVIP bus connectors, make sure that the pins are lined up properly. If the connector is not lined up with the header, you may bend or break a header pin.
NEVER pull out the connectors by pulling the cable. Always use the white pull-out tabs to remove the MVIP bus connectors.
Fasten each board's end bracket to the back of the chassis.
Replace the cover, and re-connect the computer to its AC power source.
Now connect the AG Connect board to your telephone lines, and connect the external power supply (if necessary), as described in the following sections.
2.4.2 Connecting Telephone Lines
Important Safety Notes for Telephony Connections:
Installation of this board and associated telephone wiring is to be performed only by competent technical personnel.
Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the jack is specifically designed for wet locations.
Use caution when installing or modifying telephone lines.
On the AG Connect board's end bracket is a high density female D-subminiature connector to interface with telephone lines. Adapter cables such as NMS part no. 2228 are available which you can use to connect the board directly to a standard telephone company interface.
Cable P/N 2228 has a 62 pin male connector on one end (to connect to the board) and a male RJ21X on the other (to connect to the telephone company interface).
Appendix B
lists the signals and pin numbers from the AG Connect board to the telephone line interface.
2.4.3 Connecting a Power Supply (S Connect-x, S/T Connect Only)
S Connect-
x
and S/T Connect boards require a 24 Volt, 1 amp power supply to provide "talk battery" to power the operator work stations.
We recommend using an NMS PS-16 power supply (NMS part no. 2169). Connect the -24 V DC lead to pin 25 of the RJ21X connector. Connect the COMMON lead to pin 50. (A complete list of pinouts appears in
Appendix B
.)
The external power supply must be ground referenced to the computer system. To ensure this, make sure the ground wire on the AC plugs for both the power supply and the computer are properly "earth referenced"; that is, installed on a common power line.
2.4.4 Checking the Power LED (S Connect-x, S/T Connect Only)
Once you have plugged the adapter cable into the AG Connect board, connected the external power supply properly, and powered your system on, you can check that the power is properly connected by watching the LED located on the AG Connect board's end bracket (see Figure
4
). This LED indicates whether the DC voltage from the power supply is connected properly. When the DC voltage is properly connected, this LED remains on steadily. When DC voltage is not connected, the LED is off.
Figure 4. AG Connect board end bracket
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As you insert the MVIP bus connectors, make sure that the pins are lined up properly. If the connector is not lined up with the header, you may bend or break a header pin. NEVER pull out the connectors by pulling the cable. Always use the white pull-out tabs to remove the MVIP bus connectors.