User guide

August 2001 105
Configuring the E1 Environment
Configuring the Carrier
Configure the carrier parameters for your line using the
function CONFIG_CARRIER, or configure only line coding and
CRC using the Configuration Wizard. Using
CONFIG_CARRIER, you configure all channels on a given
trunk to use the same values. To configure the ADI, invert, or
loopback parameters separately for individual channels, use
CONFIG_CHANNEL and RHT_CONFIG_CHANNEL.
However, since there is rarely a need to configure these
parameters separately, we recommend using
CONFIG_CARRIER.
For all parameters, contact your carrier for information about
the appropriate settings.
Configuring CRC
You can enable or disable your system to transmit CRC data
and the CRC error report. The CRC calculation and error report
provide a good way to verify the data transmitted on the line
and to analyze the data link in both directions.
Setting the CRC parameter incorrectly causes the board to
indicate framing errors, which causes line functions to fail.
Configuring the Line Coding Method
E1 boards support line coding with or without HDB3. Setting
the incorrect line coding method can cause bipolar violations or
noise on the line, so be sure your configuration matches the
specifications of your carrier.