ADTRAN TSU 120, User Manual

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Chapter 3. Operation
61200.129L1-1 TSU 120 User Manual
73
Scroll to display the data port to be configured and
press Enter to select. The unit displays the first of six
menu items for the Nx56/64.
0.1 Nx56/64 Port Configuration (Port Config) Menu Items
The menu items are:
RATE 56/64
This sets the base rate of the interface. The actual data
rate depends on the number of DS0s assigned to the
Nx port. The DTE data rate vs. the number of DS0s is
provided in the appendix, DTE Data Rate Chart.
Choices: 56K or 64K
TX CLK
Controls the clock used by the TSU 120 to accept the
transmit (TX) data from the DTE. Normally this is set
to Internal. If the interface cable is long, causing a
phase shift in the data, the clock can be selected as
INT/INV (Internal/Inverted). This switches the phase
of the clock which should compensate for a long cable.
If the DTE provides a clock with TX data, the clock
selection is set to External. The TSU 120 will depend
on an externally supplied clock to accept the TX data.
Choices: Internal, Int-Inv, or External
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 insure ones (1s)
density.
Choices: Normal or Invert
If Invert is selected, zero (0) inhibit should also be selected
to prevent an open DTE input from placing zeros on the
network.
CTS
Used to control characteristics of CTS.
Choices: Normal, (see Table 3-A) or Force On