User manual

Chapter 5. Configuration Menu

5-16 TDU 120e User Manual 61202156L1-1

DBU config -- DBU operation

Under Nx56/64 config, the menu items are:

DSO Rate

This sets the base 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 I

NVERT

. 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 or Invert

CTS

Used to control characteristics of CTS.

Choices: Normal, (see Table 5-1) or Force On

DCD

Data Carrier Detect. Indicates to the DTE when a valid signal

is being received at the Network Interface.

Choices: Normal (see Table 5-1) or Force On

DSR

Data Set Ready. This signal indicates to the DTE when the

DCE is turned on and ready for operations.

Choices: Normal (see Table 5-1) or Force On

NVERT

is selected, zero (0) inhibit should also be selected to pre-

vent an open DTE input from placing zeros on the network.