Specifications

Defining Operating Parameters
5-19
Range
This parameter does not appear on the screen for units equipped with the 15P09AA or
Model D Aggregate card. Extended range operation is automatic and allows operation in
loops from 0 to -51dB. For units equipped with older Aggregate cards (Model A or C),
the Range parameter specifies whether the DAP can operate in the extended range.
When operating in the normal range, the DAP receiver accommodates a nominal loop
loss of 0 to -34 dB which complies with the requirements of AT&T Publication 62310.
In DDS, DDSNI, and DDS-SC modes, the extended range feature allows operation in
loops from -35 to -40 dB for DTE rates from 19.2 to 38.4 Kbps and in loops from -35 to
-43 dB for the 56 Kbps DTE rate. In LADC and LDM modes, the extended range feature
allows operation in loops from -35 to -40 dB for DTE rates from 2.4 to 38.4 Kbps and in
loops from -35 to-43 dB for the 56 and 64 Kbps DTE rates. The performance in the
extended range is dependent on the telephone company equipment.
Latching Loopback
This parameter enables/disables the latching loopback test in DDS-SC or CC64 mode.
This is an optional network loopback test which is initiated by the reception of a complex
sequence of code bytes as defined by AT&T Publication 62310.
Transmit Calibrate
This parameter appears on the screen only for units equipped with the Model A or C
Aggregate Card. It allows you to calibrate the transmitter. Before calibrating the
transmitter, you must disconnect the cable from the dedicated line connector, labeled
DED. Press the button beneath Accpt. When calibration is complete, reinstall the
dedicated line cable. This procedure must be performed whenever the power supply is
changed.
Pattern
This parameter defines the test pattern. Two patterns are available: 2047 and 511. The
pattern you select is the one that will be used any time a Self-Error, End-to-End Error,
Loop 2 Error, Local-Error, or Network-Error test is activated.
Secondary Channel
This parameter specifies whether the Clear Secondary Channel feature or the Remote
Control Panel feature is enabled. The Clear Secondary Channel feature is not available
for DDS and CC64 modes. When Clear Secondary Channel is selected, you can use the
secondary channel bandwidth for your own application. All T7 diagnostic and Remote
Control Panel functions are disabled.