Specifications

Excalibur Multirate DAP Installation and Operation
5-14
EIA Pin 21
This parameter specifies whether pin 21 of the DTE interface functions as a Remote
Digital Loop input or a Signal Quality indicator. The Remote Digital Loop setting allows
a DTE to initiate a remote digital loop by placing a High signal on pin 21. When set to
Signal Quality, the DAP places a High signal on this pin when the quality of the received
signal is acceptable (Good or Best on the front panel). If you want this pin to function
as a Remote Digital Loop input but do not want this test to be initiated from a DTE, set
this parameter to DL disabled. For proper operation, you must set jumper JS5 on
standalone models equipped with the 15P09AA-1 Aggregate card to match this parameter
setting. For central site models equipped with the Model D Aggregate card, set
switchbank S3, Switch 2 and for older standalone and central site models (Model A or C
Aggregate card), set SW5 to match this parameter setting. This parameter is not
available for DDS or CC64.
Beeper
This parameter defines the operation of the front panel beeper. Four options are
available:
• None - the beeper is disabled.
• Alarm - the beeper sounds whenever an alarm is activated.
• Keys - the beeper sounds whenever a button is pressed.
• Both - the beeper sounds whenever a button is pressed or an alarm is activated.
EIA Pin 18
This parameter enables/disables DTE control over the Local Digital Loopback Test.
When enabled, a DTE can initiate a Local Digital Loopback Test by placing a high signal
on pin 18 of the DTE interface.
Remote Digital Loop
This parameter specifies whether the DAP performs a V.54 Digital Loop or a standard
(Racal) Digital Loop when it receives a remote digital loop command from the far-end
unit. This parameter is only applicable for Aggregate level tests. Refer to Chapter 7 for
descriptions of test levels and both types of loops.