User manual

Release 2.2 Digium, Inc. Page 37

Chapter 3: Configuration

Configuring T1/E1 Lines

1. Begin by opening the /etc/zaptel.conf. This is where the base

configuration for your hardware is stored. If you did a

make samples

during the install, you can read through the commented example and

edit it to your needs. Otherwise, continue following these instructions.

2. Next, configure your T1/E spans in the span definitions. They are in

the following format:

span=<span num>,<timing source>,<line build out

(LBO)>,<framing>,<coding>[,yellow]

Since this card only has one span, the <span num> will be 1 if it is the

only Digium digital interface card in your system.

All T1/E1 spans generate a clock signal on their transmit side. The

<timing source> parameter determines whether the clock signal from

the far end of the T1/E1 is used as the master source of clock timing. If

it is, our own clock will synchronise to it. T1/E1's connected directly

or indirectly to a PSTN provider (telco) should generally be the first

choice to sync to. The PSTN will never be a slave to you. You must be

a slave to it.