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Figure 19.
Block Remote Loop with 511/511E
Remote Digital Loop with 511/511E
The Remote Digital Loop with 511/511E is shown above. After
RDL is established the Remote units' Restart Timer is set to one
minute. This has been done because when the 511/511E gen-
erator is started on the local unit, the Remote framer begins
seeing unframed packets. The Remote unit can not distinguish
the 511/511E pattern from the line being disconnected so the
Restart Timer has been lengthened to allow the pattern genera-
tor to function. Once the 511/511E test is started, the Local unit
changes its' Restart Timer to one minute. The pattern originates
within the Processor and is sent to the Remote unit. It is then
looped back to the Local unit where it is evaluated for errors.
After 45 seconds, the Pattern Generator will timeout and stops
sending the pattern. The ER led will begin blinking until the user
turns off the 511/511E switch.
Figure 20.
Block Diagram DataMode with 511/511E
Data Mode with 511/511E Pattern Generators
When the units enter DataMode it is possible to turn on the 511/
511E pattern generators on both ends of the link. Once a 511/
511E pattern is selected on one end of the link, the pattern gen-
erator will begin transmitting unframed 511/511E through the
line to the Remote end. A possible problem with this test can
occur due to the Restart procedure. Once the Local 511/511E is
turned on, the Remote unit begins receiving an unframed 511
pattern. If the Remote unit does not turn on the 511/511E-pat-
tern generator within 4 seconds, the Remote unit will Restart
and enter the StartUp mode. Note that once the 511/511E-pat-
tern generator is started the Restart timer is changed to one
minute (only on the unit which has the pattern enabled). If both
Pattern
Gen/Det
Loop
Contr
ol
Loop
Contro
l
Pattern
Gen/Det
Processor
Processor
Framer
Framer
Line
Pattern
Gen/Det
Loop
Contr
ol
Loop
Contro
l
Pattern
Gen/Det
Processor
Processor
Framer
Framer
Line