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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 transmis-
sion. As can be seen from Figure 11, the 511/511E pattern gen-
erator has no data path connections available. The 511/511E
pattern generator is still available on the remote unit. For more
information on the proper operation of this pattern generator
please refer to the "Remote Digital Loop with 511/511E" sec-
tion.
Figure 18.
Block Diagram Remote Loop
Remote Digital Loop
The Remote Loop uses the EOC channel (an out-of-band sig-
naling channel) to establish the remote link. Upon the RDL
switch being thrown or DTE initiation, a RDL_ON Request sig-
nal is sent to the remote unit. The Remote unit then responds
with an RDL Acknowledge command and the link is established.
Data originates at the local DTE and is looped at the Remote
PROCESSOR back to the Local DTE. Note that the data is also
passed through to the Remote DTE and is not squelched. When
a Remote unit enters RDL, it changes its' Restart timeout to one
minute (the reason will be explain in the RDL with 511/511E
section). If the line is disconnected, the local unit will Restart
(NS led activated) after 4 - 6 seconds, but the Remote unit will
wait for one minute before it Restarts. Note that the transmit
data at the Remote DTE is ignored. When the switch is thrown
or the DTE removes the RDL request, the local unit will transmit
an RDL_OFF Request to the Remote unit. The local unit will
keep its' TM led active until this request has been completely
sent out. If the switch is thrown again before the completion of
the termination phase the switch will be ignored until it is placed
back into the normal position.
Pattern
Gen/Det
Loop
Contr
ol
Loop
Contro
l
Pattern
Gen/Det
Processor
Processor
Framer
Framer
Line