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RightFax 8.5 Fax Board Guide 33

Appendix A

Working with DID Lines

ID (direct inward dialing) lines support inbound phone service only. Loop-start lines must be

used for outbound service. A DID interface assigns more than one telephone number to a pair of

wires (a telephone trunk). This enables RightFax to provide automatic routing of faxes to the

proper destination in a multi-user system.

For example, if a company is assigned one DID trunk and 100 telephone numbers ranging from 239-

9400 to 239-9499, when any one of the numbers in this range is dialed and the DID trunk is

available, the telephone company connects to the trunk and transmits the last few digits (usually

three or four) of the dialed number to the board. By detecting these digits, the fax boards can detect

which one of the 100 numbers was dialed by the caller.

If the 100 telephone numbers correspond to 100 different users on a RightFax system, each user

could have a private fax telephone number. All with only one telephone trunk and one fax channel

required.

If the trunk is busy receiving a fax for one of the users, callers to any of the other 99 numbers

encounter a busy signal. Because of this, you may require more than one DID trunk to which the

range of DID telephone numbers is assigned. The number of trunks required depends on the traffic

demands on the system.

Since DID trunks only support inbound calls, a fax messaging system using DID requires one or

more additional loop-start telephone channels for sending faxes.

Warning Never insert a loop-start line into a DID port. Doing so will damage the fax board and void all

warranties. If you have any doubts, test the phone line with a volt meter prior to connecting it to a DID fax

port to ensure that no current exists on the line.

For DID telephone service, RightFax recommends the following options be configured:

8 Set Trunk Type to “Loop Start.”

8 Set Service Type to “Wink Start.”

8 Set Signalling to “DTMF (Touch-Tone).”

8 Set Digit Length to “4.”

All DID fax boards must supply the DID trunk with continuous –48V DC power. Because no source

of –48V DC exists in the computer, this power must be supplied from an outside source. A Tellabs

8012 (or equivalent) regulated power pack can supply the necessary power.

Connecting a Tellabs 8012 power supply to a DID fax board

1. Turn off the computer.

2. Locate the contact block on the back of the power supply (opposite the plug end) and loosen the

contact labelled 48V RET.

3. Locate the supplied power cord, consisting of two wires (one green and one red) with a plastic

jack at one end and two metal prongs at the other end.

4. Connect the metal prong on the end of the green wire to the 48V RET contact and tighten the

contact screw.

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Dialogic Brooktrout TR1034 BRI Bedienungsanleitung Seite 33