Patton electronics NetLink 1094ARC User Manual page 15

Pattern Loop
Framer
Line
Gen/Det Contr ol
Processor
Figure 13. Block Diagram Local Loop Mode 1
Pattern Loop
Framer
Line
Gen/Det Contr
ol
Processor
Figure 14. Block Diagram Local Loop Mode 2
Local Loop When the unit is placed into a Mode 1 Local
with 511/511E Loop and the 511/511E pattern generator is acti-
vated, the local pattern generator begins send-
ing out a 511/511E pattern to the Loop Control
block. The Loop Control block will loop this data
back to the 511/511E pattern detector block,
which will evaluate the data for errors. Because
the 511/511E pattern generator is contained
within the Processor the data is unframed so the
framer will begin seeing unframed packets. The
framer receives this unframed data and can not
distinguish this information from a line discon-
nection (this would cause the units' Restart pro-
cedure to start). What we have done to allow
this mode to work is to add time outs for the pat-
tern generators. When the 511/511E is initiated
the line restart procedure is changed to one
minute. The 511/511E pattern will timeout after
45 seconds. So if the 511/511E is turned on dur-
ing a local loop, the restart procedure is set to
one minute, but the 511/511E pattern will time-
out after 45 seconds, allowing the framer to
begin seeing framed packets (and not restart the
box). After the 511/511E pattern times out, the
ER led will begin flashing.
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Loop Pattern
Framer
Gen/Det
Contro l
Processor
Loop Pattern
Framer
Contro Gen/Det
l
Processor
Local Loop It will remain this way until the pattern generator
with 511/511E switch is turned off. Note that the data at the
(continued) local DTE and the remote DTE are not valid.
Because the data is unframed there is no way
for the framer to send this data out to the DTE.
This is an important distinction because other
Patton units will send out the 511 pattern.
When the unit is placed into a Mode 2 Local
Loop, the 511/511E pattern generator on the
local unit is unavailable for transmission. As can
be seen from Figure 14, the 511/511E pattern
generator has no data path connections avail-
able. The 511/511E pattern generator is still
available on the remote unit. For more informa-
tion on the proper operation of this pattern gen-
erator please refer to the "Remote Digital Loop
with 511/511E" section.
Loop
Framer Pattern
Line
Contr
ol
Gen/Det
Processor
Figure 15. Block Diagram Local Loop Mode 1 with 511/511E
Pattern Loop
Framer
Line
Gen/Det Contr ol
Processor
Figure 16. Block Diagram Local Loop Mode 2 with 511/511E
Loop Pattern
Framer
Contro Gen/Det
l
Processor
Loop
Pattern Framer
Contro l
Gen/Det
Processor
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