Chapter 3. Configuration

Off When OOS/OOF or Test

The SR lead remains on except when the unit receives an OOS/ OOF condition from the network or when the unit is executing a test.

CD

Selects the control mode for the carrier detect (CD) lead. This field only appears if a V.35 interface card is installed in the selected port.

Forced On

The CD lead remains active at all times.

Off When OOS/OOF

The CD control lead remains on unless the T3SU 300 receives an

OOS/OOF condition from the network.

Transmit Clock

Selects the source of the clock used to transfer data from the DTE to the T3SU 300. This selection is only available if a V.35 interface card is installed in the selected port. Use the following chart to determine your selection:

Select...

If...

 

 

Normal

you want the transmit clock to be derived

 

from the T3SU 300.

 

 

Invert

your DTE device cannot provide a trans-

 

mit clock signal and data errors are

 

present between your DTE and the T3SU

 

300.

 

 

External

you are transmitting at high rates. This se-

 

lection eliminates data errors caused by

 

excessive delays in the DTE transmit clock

 

receiver, transmit data driver, and cable

 

length.

 

 

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T3SU 300 User Manual

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ADTRAN T3SU 300 user manual Off When OOS/OOF or Test, Transmit Clock, Select