# NetworkInterface.T1E1[x].FrameType

Defines the T1 or E1 trunk framing format for current boards or current trunks.

#### Syntax

NetworkInterface.T1E1[x].FrameType = frame_format

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

CEPT

#### Allowed values

D4 | ESF | CEPT

#### Example

NetworkInterface.T1E1[0..3].FrameType = D4

#### Details

The following formats are available for T1 trunks:

Format | Description
--- | ---
D4 | Standard superframe formatting
ESF | Extended superframe formatting

The following format is available for E1 trunks:

Format | Description
--- | ---
CEPT | Framing format conforming to ITU recommendation G.703 for PCM 30 (30 channels with channel associated signaling).

For more information, refer to Framing.

#### See also

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