150-357-200-02, Issue 2
Troubleshooting
HXU-357 List 1
February 9, 1999
53
TLB1
(
) (
Terminal Loopback to the network at the DSX-1 line. Activated through the
multiplexer unit (
option from the Shelf Status screen followed by the
option
sequence , , ).
See
FLB1
(
)
Facility loopback to the customer at the DSX-1 line. Activated through the
multiplexer unit (
option from the Shelf Status screen followed by the
option
sequence , , ).
See
RFL
(
)
Remote facility loopback from the far-end DS3 line. Activated through the
multiplexer unit (
option from the Shelf Status screen followed by the
option sequence
,
, ).
RTL
(
) (
Remote terminal loopback from the far-end DSX-1 line. Activated through
the multiplexer unit (
option from the Shelf Status screen followed by the
option sequence
,
, ).
CREM
Customer remote loopback is activated by selecting the line unit on the Shelf
Status Screen and then the
selection (Loopback Mode) from the HLU
Maintenance Terminal Main Menu.
NLOC
Network local loopback is activated by selecting the line unit on the Shelf
Status screen and then the
selection (Loopback Mode) from the HLU
Maintenance Terminal Main Menu.
CDUn
(c)
Customer doubler n loopback is activated by selecting the line unit on the
Shelf Status screen and then the
selection (Loopback Mode) from the
HLU Maintenance Terminal Main Menu.
NDUn
Network doubler n loopback is activated by selecting the line unit on the Shelf
Status screen and then the
selection (Loopback Mode) from the HLU
Maintenance Terminal Main Menu.
CLOC
Customer local loopback is activated by selecting the line of the Shelf Status
screen and then the
selection (Loopback Mode) from the HLU
Maintenance Terminal Main Menu.
NREM
Network remote loopback is activated by selecting the line on the Shelf
Status Screen and then the
selection (Loopback Mode) from the HLU
Maintenance Terminal Main Menu.
(a) To perform this loopback command, the DS3 and DS1 ports must be Out-of-Service.
(b) Copies data in both directions. All other loopbacks send AIS to a disconnected segment.
(c) The number of the doubler.
Table 12.
System Loopback Definitions (Continued)
Test Point
Loopback Definition
M
1
5
2
M
1
5
1
M
1
4
3
M
1
5
3
D
D
D
D
D
D