or INVERT

Chapter 5. Configuration Menu

The CONFIG menus for options ports are described in sep- arate sections of the manual supplied with the option card.

Nx/DBU (0.1) Menu Items

The Nx/DBU port has two main menus:

NX56/64 CONFIG -- Nx operation and DBU CONFIG -- DBU operation.

Nx56/64 Config

Under NX56/64 CONFIG, the menu items are:

DS0 RATE

This sets the base DS0 rate of the interface. The actual data rate depends on the number of DS0s assigned to the Nx port.

Choices: 56K OR 64K

TX CLK CNTRL

Controls the clock used by the TDU 120e to accept transmit (TX) data from the DTE. The default is NORMAL. If the interface cable is long, causing a phase shift in the data, the clock can be selected as INVERT. This switches the phase of the clock which should compensate for a long cable.

Choices: NORMAL, INVERT

DATA

Used to control the inverting of the DTE data. This inversion can be useful when operating with an HDLC protocol. Often used as a means to ensure 1s density.

Choices: NORMAL

If INVERT is selected, zero (0) inhibit should also be selected to prevent an open DTE input from placing zeros on the network.

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ADTRAN TDU 120e user manual Nx/DBU 0.1 Menu Items, Nx56/64 Config