Specifications

7-34
Softkey Menu Descriptions
Sync & Audio Menu
Sync & Audio Menu
Path
or
Description
The key gives access to a menu of softkeys that control how the error
detector searches for synchronization (that is, tries to align the incoming pattern with the
internal pattern that the user has selected). The patterns are deemed to be synchronized
when the measured error rate is less than the set sync threshold: a user-defined value. Also
included are softkeys to control an audible warning that sounds when bit errors or sync
loss occur.
The softkeys are as follows:
Toggles between the error detector automatically initiating
re-synchronization whenever synchronization is lost
(AUTOMATIC), and requiring the user to initiate
re-synchronization by hand (MANUAL).
Forces the error detector to initiate a re-synchronization.
Allows the selection of a synchronization threshold 1E−01
through 1E−08 in decade steps.
When a sync-start is initiated, the message Trying to gain sync
is displayed on the prompt line. If, after trying all possible
reference pattern alignments, sync is still not gained then the
message Sync attempt failed, retrying is displayed. Note
selecting a sync threshold of too high a level can cause
mis-synchronization.
Toggles on or off an audible warning that bit errors have
occurred. The audible output varies with error rate. The effect of
changing error rate is:
• Isolated errors - output produces a 100 ms tone.
• Other error rates - 5% change in error rate produces an
audible change.
The audible output can be set to one of 15 volume levels by
selecting this key then using the RPG knob on the Agilent
70004A display.
When this key is underlined (ON) an audible warning will sound
if sync loss occurs
sync & audio MENU
sync & audio
sync & audio
sync & audio
SYNC AUTOMAN
START SYNC
1e-1 to 1e-8
AUDIO ON OFF
AUDIO VOLUME
AUDIO SYNC LS