# NetworkInterface.T1E1[x].Impedance

Specifies the type of cable connecting a CG 6565E board to the T1 or E1 network.

#### Syntax

NetworkInterface.T1E1[x].Impedance = cable_type

x = 0-(n-1) (0-based trunk number or range of trunk numbers where n equals the number of trunks on the board.)

#### Access

Read/Write

#### Type

String

#### Default

G703_120_OHM

#### Allowed values

DSX1 | G703_75_OHM | G703_120_OHM | HIGH_IMPEDANCE

Valid settings are:

- DSX1 for T1

- G703_75_OHM for E1 75 ohm (MD1 RJ-45 variants only)

- G703_120_OHM for E1 120 ohm

- HIGH_IMPEDANCE for T1 or E1

Note: To use E1 75 ohm impedance on the CG 6565E board variant with an MD1 Mini RJ-21 interface, you must use a balun to convert the impedance from 120 ohm to 75 ohm.

#### Example

NetworkInterface.T1E1[0..7].Impedance = G703_120_OHM

#### Details

Trunk impedance on the CG 6565E is controlled through a board configuration file. Because trunks are configured in pairs, the configuration setting must be identical for both trunks in a given pair.

The following table lists the trunk pairings for the CG 6565E daughterboards:

Daughterboard | T1/E1 interface | Trunk pairings | Supported settings
One- or two-trunks | MD1 RJ-45 (wired as an RJ-45) | 0 or 0 and 2 | DSX1 G703_75_OHM G703_120_OHM HIGH_IMPEDANCE
Four-trunks | MD1 RJ-45 | 0 and 2 1 and 3 | DSX1 G703_75_OHM G703_120_OHM HIGH_IMPEDANCE
Eight-trunks | MD1 Mini RJ-21 | 0 and 1 2 and 3 4 and 5 6 and 7 | DSX1 G703_75_OHM (use an external balun) G703_120_OHM HIGH_IMPEDANCE Note: For 75 ohm, you must use a balun to convert the impedance from 120 ohm to 75 ohm. For more information, refer to Cabling a CG 6565E board.

For more information, refer to Configuring the T1 or E1 interface.

#### See also

NetworkInterface.T1E1[x].CRCMFMode, NetworkInterface.T1E1[x].D_Channel, NetworkInterface.T1E1[x].FrameType, NetworkInterface.T1E1[x].Length, NetworkInterface.T1E1[x].LineCode, NetworkInterface.T1E1[x].SignalingType, NetworkInterface.T1E1[x].Type