Patton electronic 1094A user manual Remote Digital, Loop with, 511/511E

Remote Digital	The Remote Digital Loop with 511/511E is
Loop with	shown above. After RDL is established the
511/511E	Remote units' Restart Timer is set to one
	minute. This has been done because when the
	511/511E generator 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 discon-
	nected so the Restart Timer has been length-
	ened to allow the pattern generator 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.

Framer	Pattern	Loop	Line	Loop	Pattern	Framer
	Gen/Det	Control		Control	Gen/Det
	Processor			Processor

Figure 12. Block Remote Loop with 511/511E

Data Mode with When the units enter DataMode it is possible to

511/511E Pattern turn on the 511/511E pattern generators on

Generatorsboth ends of the link. Once a 511/511E pattern is selected on one end of the link, the pattern generator 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-pattern generator within 4 seconds, the Remote unit will Restart and enter the StartUp mode. Note that once the 511/511E-pattern generator is started the Restart timer is changed to one minute (only on the unit which has the pattern enabled). If both units enable the 511/511E pattern within 4 sec- onds of each other, both units will be transmit- ting and receiving the 511/511E pattern. Both framers are now receiving unframed data and will restart after one minute. The 511/511E pat- tern generators will TimeOut after 45 seconds re-enabling the normal data path. The ER led will begin flashing until the user terminates the test.

Framer	Pattern	Loop	Line	Loop	Pattern	Framer
	Gen/Det	Control		Control	Gen/Det

Processor Processor

Figure 13. Block Diagram DataMode with 511/511E

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