User guide

ASCOM USER GUIDE

High Speed Base Band Modems

Your modem should now be connected as illustrated in the following diagram:

4.3 CONFIGURING THE MODEMS

4.3.1 Desktop modem to desktop modem with no external timing

A modem to modem link (as in diagram 2.2.1) requires a straight through connection, i.e. pair

one of the first modem connects to pair one of the second modem. If using two pair modems

in their two pair mode, the second pair of each modem should also be directly connected.

The units will not operate if the pairs are crossed over.

One end of the link will need to be configured as a MASTER and the other end will be

configured as SLAVE. The difference being that the master unit can download the major

settings to the slave, and not vice versa.

The downloaded settings are: number of pairs, line rate, and control line transfer. All other

settings are not downloaded, and have to be set locally.

Copper Pairs

Interface Cable

(not supplied)

Mains Connection

(supplied with correct plug)

16 ASCOM USER GUIDE

High Speed Base Band Modems

4.2 CONNECTING THE HIGH SPEED MODEM

Connect the mains lead into the IEC type socket on the rear of the unit and plug the other

end into an earthed mains supply.

WARNING! This unit must be used only with power supplies providing a safety earth.

The unit should power up, the following messages will be displayed:

Displays type and version of software

This will depend on the status of the unit

Plug one end of the RJ45 to RJ45 line cord lead into the RJ45 line connector socket on the

rear of the unit. The other end connects to your copper line pairs. For the RJ45 connector pair

one is on pins 7 and 8 and pair two (on two pair modems only) is on pins 4 and 5. In the UK

connection is made via RJ45 to BT style converter, connections on pins 1 and 6 for pair one

and 2 and 5 for pair two.

RJ45 TO BT STYLE CONVERTER RJ45 PLUG

A suitable lead is required to connect the modem user interface connector on the rear of the

unit to your DTE equipment. For details of interface connector pin-outs see section 8.

Pin 1