ADTRAN T3SU 300 User Manual page 51

Table 3-2. Additional V.35 Interface Port Configuration Selections (Continued)
Selection
CD
T C
RANSMIT LOCK
Transmit Clock
Selects the source of the clock used to transfer data from the DTE to
the T3SU 300. Use the following chart to determine your selection:
Select...
N
I
E
Selecting Normal or Invert clocking options depends on your DTE,
cable length, and cable characteristics. To verify error-free
operation, perform a DTE loopback test and a BERT test from the
DTE. See the chapter, Diagnostics, on page 85 for information on
performing these tests.
Configuration Selections for DSX-1 Interfaces
The configuration selections listed in Table 3-3 on page 52 are
available for Quad DSX-1 interfaces. Separate selections can be
made for each of the four DSX-1 ports of the card. This menu is
shown in Figure 3-5 on page 52.
61202217L1-1B
Description
Selects the control mode for the carrier detect (CD) lead.
F O
: The CD lead remains active at all times.
ORCED N
O W OOS/OOF
FF HEN
T3SU 300 receives an OOS/OOF condition from the network.
See the following section for a description of this item.
If...
you want the transmit clock to be derived from the
ORMAL
T3SU 300.
your DTE device cannot provide a transmit clock
NVERT
signal and data errors are present between your DTE
and the T3SU 300.
you are transmitting at high rates. This selection
XTERNAL
eliminates data errors caused by excessive delays in
the DTE transmit clock receiver, transmit data driver,
and cable length.
T3SU 300 User Manual
: The CD control lead remains on unless the
Chapter 3. Configuration
51