Digium TE820 User Manual download pdf (Page 47)

Chapter 3: Configuration

Coding:

T1 coding can be AMI or B8ZS. E1 coding can be AMI or HDB3. E1

can also have the extra flag CRC4 at the end for CRC4 checking.

Yellow:

The optional yellow flag can be added at the end for transmitting a

yellow alarm when no channels are open.

The following is a typical setup for a telco in the US:

span => 1,1,0,esf,b8zs

In Europe:

span => 1,1,0,ccs,hdb3

Specify the channel definitions. The format is:

A list of valid devices are specified in the sample system.conf file.

The following is a typical setup for a T1 PRI in the US:

bchan = 1-23

dchan = 24

DAHDI uses modular echo cancellers that are configured per channel.

The echo cancellers are compiled and installed as part of the dahdi-

linux package. You can specify the echo canceller to be used for each

channel. The default behavior is for there to be no echo canceller on

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Digium TE820 User Manual Page 47