Loop Back Testing - Toshiba DK14 Installation And Maintenance Manual

T1

Loop Back Testing

Loop Back Testing
The RDTU provides three loop back test configurations. These loop back tests should be
performed as required in conjunction with CSU loop back tests (see CSU loop back test
documentation).
RDTU Self Test
This test should be performed upon initial installation of a RDTU PCB. Program the RDTU per
"System Programming for T1"
instructions in
RDTU Self Check
MM8976B
MITEL Chip
Notes
P1 and P2 to On position (see
G
Remove NDTU cable from RDTU amphenol connector.
G
G
G
G
Figure 8-8 RDTU Self Test
Network/CSU T1 Span Test
This test will verify that the far end (CSU, Network, or CPE) T1 equipment and span cabling is
functioning properly. This test checks all T1 span cabling including the RDTU Amphenol cable
and connector. Guidelines for this test are provided in
8-14
on
Figure 8-8, before connecting the far end (CSU, Network, or CPE) T1 span line.
P1
P2
After about 12 seconds, all RDTU LEDs (except PRI/SEC SYNC) turn Off.
Appropriate primary or secondary sync. LED flashes if RDTU is Primary or Secondary
reference.
If RDTU is not a primary or secondary reference, then the Primary and Secondary sync
LEDs should turn Off.
Page 8-3; then perform the RDTU loop back test, per the
Remove NDTU Cable
CSU
Figure 8-2).
Figure
Network
Interface
Network
Unit
8-9.
Strata DK I&M
1671
5/00