# Configuring the T1 or E1 interface

The CG 6060C board has been shipped to you configured as a T1/E1 120 ohm board. There are no hardware changes required for the T1/E1 120 ohm configuration. Set the board configuration by performing the following steps:

1. Set the NetworkInterface.T1E1[x].Type keyword.

2. Set the NetworkInterface.T1E1[x].Impedance keyword.

3. Set the remaining keywords.

4. Verify the cables.

## Set the NetworkInterface.T1E1[x].Type keyword

Set the NetworkInterface.T1E1[x].Type keyword in the board keyword file to T1, E1, or NONE. You must specify the trunks that are being used as either T1 or E1. Do not specify more than one trunk type per board. Specify unused trunks as NONE. For example:

NetworkInterface.T1E1[0..12].Type = E1
NetworkInterface.T1E1[13..15].Type = NONE

## Set the NetworkInterface.T1E1[x].Impedance keyword

Set the NetworkInterface.T1E1[x].Impedance keyword to one of the following values based on the board variant and the T1/E1 configuration:

Board variant | T1 value | E1 120 ohm value | E1 75 ohm value | High impedance (T1 or E1) value
4 trunk (RJ-48C) | DSX1 | G703_120_OHM | G703_75_OHM. See Note 1. | HIGH_IMPEDANCE
8 trunk (RJ-48C) | DSX1 | G703_120_OHM | G703_75_OHM. See Note 1. | HIGH_IMPEDANCE
8 trunk (MD1 RJ-21) | DSX1 | G703_120_OHM | G703_120_OHM. See Note 2. | NA
16 trunk (MD1 RJ-21) | DSX1 | G703_120_OHM | G703_120_OHM. See Note 2. | NA

Notes:
1. Requires using an RJ-48C to BNC splitter cable. For more information, see Connecting to an E1 75 ohm network (RJ-48C interfaces).
2. The board must operate in 120-ohm mode. Use a signal entry panel (SEP) or equivalent to convert the output drive and source impedance to the 75-ohm standard.

## Set the remaining keywords

Set the NetworkInterface.T1E1[x].FrameType, NetworkInterface.T1E1[x].LineCode, and NetworkInterface.T1E1[x].SignalingType keywords to values appropriate for your configuration. For more information, refer to NetworkInterface.T1E1[x].FrameType, NetworkInterface.T1E1[x].LineCode, and NetworkInterface.T1E1[x].SignalingType.

## Verify the cables

Ensure that you use the correct cables. For more information, refer to:

- Connecting to a T1 network.

- Connecting to an E1 network.

## Sample T1 trunk configuration

The following example shows a sample T1 configuration for 16 trunks:

NetworkInterface.T1E1[0..15].Type = T1
NetworkInterface.T1E1[0..15].Impedance = DSX1
NetworkInterface.T1E1[0..15].LineCode = B8ZS [other values possible]
NetworkInterface.T1E1[0..15].FrameType = ESF [other values possible]
NetworkInterface.T1E1[0..15].SignalingType = CAS [other values possible]
DSP.C5x[0..95].XLaw = MU_LAW
DSPStream.VoiceIdleCode[0..15] = 0x7F
DSPStream.SignalIdleCode[0..15] = 0x00

## Sample E1 trunk configuration

The following example shows a sample E1 configuration for 16 trunks:

NetworkInterface.T1E1[0..15].Type = E1
NetworkInterface.T1E1[0..15].Impedance = G703_120_OHM
NetworkInterface.T1E1[0..15].LineCode = HDB3 [other values possible]
NetworkInterface.T1E1[0..15].FrameType = CEPT
NetworkInterface.T1E1[0..15].SignalingType = CAS [other values possible]
DSP.C5x[0..95].XLaw = A_LAW
DSPStream.VoiceIdleCode[0..15] = 0xD5
DSPStream.SignalIdleCode[0..15] = 0x09

Note: The syntax [0..15] specifies that the configuration supports any valid number of trunks within the range of 0 through 15 trunks.