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Page 4 61291021L5-5ASection 61291021L5-5A, Issue 1
4. TESTING
Loopback Testing
Loopback tests can be performed from the CO to verify
proper loop and TRDDS-R operation. The TRDDS-R
features auto-detection capability to determine the model of
Total Reach dataport installed in the central office. This
feature allows the TRDDS-R to support multiple loopback
applications. See Table 4 for an interoperability matrix of
loopback responses supported by the TRDDS-R. The
TRDDS-R always provides an NIE latching loopback at all
rates. See Table 5 and 6 for latching and alternating loopback
sequences. The TRDDS-R supports testing of the two-wire
loop from the remote end when the CO unit is performing a
bidirectional loopback.
Figure 5. Signal Loss Indication
SC
64
56
19.2
9.6
4.8
2.4
0-10
10-20
20-30
30-40
40-50
50-56
>56
LED SIGNAL LOSS
(dB)
Signal level
Signal level indicated during
synchronization
Table 3. Faceplate Indicators
rotacidnIsutatSnoitanalpxE
CNYS
NO
neerG
deR
puderewopsitinU
htiwdezinorhcnyS
PDUCORT
htiwdezinorhcnystoN
rofkcehc;PDUCORT
dna,sliocdaol,ytiunitnoc
enillamronbarehto
snoitidnoc
CRCRAENNO
ehtnoderuccosrorrE
maertsatadgnimocni
suoiverpehtgnirud
rofkcehc;dnoces
snoitidnocenillamronba
R-SDDRTehtotresolc
CRCRAFNO
ehtdrawotderuccosrorrE
tropatadhcaeRlatoT
suoiverpehtgnirud
rofkcehc;dnoces
snoitidnocenillamronba
OCehtotresolc
KBL
NO
gnihsalF
detavitcasikcabpooL
krowtensdrawot
takcabpoollanoitceridiB
ataD,tropatadhcaeRlatoT
urhT-ssaP
CSNOlennahCyradnoceS
delbane
46NOdelbaneetaratadspbk46
65NOdelbaneetaratadspbk65
2.91NOetaratadspbk2.91
delbane
6.9NOetaratadspbk6.9
delbane
8.4NOetaratadspbk8.4
delbane
4.2NOdelbaneetaratadspbk4.2
Table 4. TRDDS-R and Total Reach Dataport
Loopback Interoperability Matrix
SDDhcaeRlatoT
stropataD
kcabpooLR-SDDRT
esnopseR
,4L,3L,2L,1L6001921
,2L5015241,2L5010141
,1L5013341,2L5010341
4L5013341,3L5013341
EIN
)tseWSU(5L6001921
)tseWSU(2L5013341
EINdnaUCO