Patton electronic 1088/K - Manual (Page 20)

20
is made (cable disconnect, poor cable quality, etc). In normal
Data Mode, if the box receives 4 seconds of unframed packets it
will restart the box and begin trying to re-establish a connection
with the far end. The distinction between framed packets and
unframed packets becomes important when we discuss the Pat-
tern Generator.
Pattern Gen/De t
This part of the Processor generates and detects the 511/511E
patterns. When transmitting 511 patterns, the information is
unframed (because it originates after the framer) and is intended to
be evaluated only by another Processor. If the units are in Data
Mode and the pattern generator is enabled on one end of the link,
the far end will begin receiving unframed packets and assume that
the line has gone down. During test modes, we force the pattern
generator to time out before it can cause the link to be killed.
Loop Control
This part of the Processor is used to control loop-backs. In a Local
Loop, the data is looped back towards the local DTE (G.703/
G.704). In a Remote Loop, the data is looped back to the line, but it
is also allowed to pass through to the framer and to the remote
DTE (G.703/G.704).
Restart Procedure and Time Outs
The restart procedure is in place to allow theunits to re-establish a
connection after the framer begins seeing unframed packets. The
Test Model Timing Chart below shows the amount of time the
framer must see consecutive unframed packets before the unit will
restart and try to establish a new line connection. The reason that
there are different Restart Times will become apparent after read-
ing the rest of the document. The 511/511E Time Out shown refers
to the amount of time the 511/511E pattern will be valid. At the end
of this time the pattern will automatically turn itself off and the nor-
mal data path will be re-established. The ER led will flash indicating
to the user that the test has timed out. The ER led will stop flashing
once the 511/511E switch is placed into the normal position.
Item Elapsed Time (seconds)
Start Up 50
Data Mode 4
511/511E Generator Enabled 60 (The generator will stop after 45 seconds.)
Remote End of an RDL 60
511/511E Time Out 45 (The pattern generator will automatically turn
off after 45 seconds. The ER LED will flash until
the user turns off the 511/511E switch.)