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Chapter 3. Operation
61200060L1-1 TSU User Manual 3-27
• V.54 Inband PLB - indicates inband transmission of V.54
loopup pattern in channels occupied by DTE data only.
This choice should be used for public fractional network
• ANSI FDL LLB - initiates the transmission of an FDL
Line loopup code toward the far end.
• AT&T Inband LLB - activates the line loopback using
inband code
• ANSI FDL PLB - initiates the transmission of an FDL
payload loopup code toward the far end
• AT&T PLB -indicatesthetransmissionofthePLB
maintenance on the FDL
5. Use the up and down scroll keys to select.
6. Press
ENTER
to record selection. The cursor returns to the
2infrontofR
EMOTE
L
OOPBACK
.
7. Use the up and down scroll keys to select 1)L
OCAL
L
OOPBACK
or 3)P
ATTERN
.
3)PATTERN - Sets the pattern for the test and initiates the
transmission of the pattern. The test is terminated by
selecting
NONE
. There are four patterns available.
• 3.24 All DS0s - generates a 3 in 24 pattern
• 511ActiveDS0s- generates a 511 test pattern and inserts
the pattern into currently active channels
• 1:8 ALL DS0s - generates a 1 in 8 pattern in all DS0s
• All Ones - generates an all ones pattern in every channel
• None - terminates pattern generation
8. Use the up and down scroll keys to select; for example,
511 ACTIVE DS0s.
9. Press
ENTER
to record selection. The TSU starts to
generate a 511 test pattern and inserts the pattern into all
DS0s.
Only
V.54
LOOPBACKS
can be used with fractional T1 since the
full T1 stream including the FDL is not transported to the far end
(unlessitisaprivatenetwork).