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# Configuring 4WTO Port Parameters for CTP Bundles (CTP Menu)

For CTP bundles, you can configure a 4WTO daughter card installed on a serial interface module.

You do not need to configure port speed and clocking for the analog 4WTO interface. Selecting this interface causes the port speed and clocking to be automatically configured.

Before you begin:

- Disable the bundle before you modify the bundle options.

To configure port parameters for 4WTO daughter cards for CTP bundles using the CTP Menu:

1. From the Main Menu, select 1) Bundle Operations.
2. Select 1) CTP.
3. Select a bundle from the list. The bundle port must have a 4WTO daughter card installed.

   If you select an active bundle, you are prompted to disable the bundle before configuring it.

4. Select 3) Port Config.
5. Select 2) Interface.
6. Select 1) Type, and set the type to Optional Interface: Voice 4W/TO.
7. Follow the onscreen instructions.

   To prevent voice channels from generating occasional noise bursts caused by unsynchronized nodes, we recommend that you either enable adaptive clocking on one end of the voice port (not both) or lock both ends of the voice port to clock references.

8. Configure the options as described in Table 1.

Field | Function | Your Action
--- | --- | ---
Dual Channel | Each CTP port with the daughter card installed can support either one or two channels. Enables or disables the use of both channels. | Select one: Disabled—Only one channel can be enabled. Enabled—Channels 1 and 2 are enabled˙
Enabled Channel | If Dual Channel is disabled, specify which voice channel you want to enable on the 4WTO daughter card. | Enter either 0 or 1.
Input Level | Specifies the input level for the 4WTO daughter card. Note the following information about the values: 0—Gain is 2:3 (signal is attenuated 33%, or 1.8 dB). 25—Unity gain, which means there is no attenuation or gain. 255—Gain is 4:1 (signal is amplified 400% or 6 dB). Intermediate values are derived with linear interpolation. The actual gain depends on the impedance of the attached device. | Enter a number from 0 through 255.
Output Level | Specifies the output level for the 4WTO daughter card. Note the following information about the values: 0—Gain is 2:3 (signal is attenuated 33%, or 1.8 dB). 25—Unity gain, which means there is no attenuation or gain. 255—Gain is 4:1 (signal is amplified 400% or 6 dB). Intermediate values are derived with linear interpolation. The actual gain depends on the impedance of the attached device. | Enter a number from 0 through 255.
Talk Squelch | Enables or disables the active squelch function on the circuit. If enabled, specifies whether the squelch is active or inactive. The squelch function gates local audio output when DSR-A (channel 1) or RTS-A (channel 0) inputs are active/inactive. | Select one: DISABLED—Disables the active squelch function on the circuit ENABLED/ACTIVE—Squelch input is grounded, and analog output is disabled. ENABLED/INACTIVE—No signal is applied to the squelch input. Input is open, and analog output is possible.
Clock Config | Specifies the type of clocking for the port. To prevent voice channels from generating occasional noise bursts caused by unsynchronized nodes, we recommend that you configure one end of the voice port (not both) for adaptive clocking or lock both ends to clock references. | Select one: 4WTO/IRIG - Master End—This end of the circuit generates a clock signal and sends it to the remote end. 4WTO/IRIG - Adaptive End—This end of the circuit receives the clock signal from the remote end. The clock slave uses its period to determine when to sample data and how to transmit data across the link. Custom—The custom clocking configuration is used.

#### Published: 2011-01-09

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