Testing
61292006L1-5C
9
TESTING
Testing for the TR OCU DP is accomplished using the same test procedures for 4-wire OCU DP
units.
describes cable loss for the Total Reach DDS Nyquist frequency of 13.3 kHz.
The TR OCU DP is equipped with logic level bantam test access jacks that permit testing in
both directions using a portable test set. Latching OCU DP loopback sequences are supported.
Choose NEAR to test toward the customer loop; choose FAR to test toward the T-carrier.
• In the FAR direction, an OCU DP loopback sequence will loop the unit across the T-carrier
system.
• In the NEAR direction, an OCU DP loopback sequence will loop the unit directly connected
to the portable test set.
Latching and alternating OCU and CSU loopback sequences are supported. Alternating
loopbacks do not operate when the a data rate of 64 kbps is selected.
NOTE
If a data rate of 64 kbps is selected, the unit will only respond to
latching loopback sequences. Alternating sequences are not valid
at this rate.
Table 5. Cable Type and Temperature Loss Data at 13.3 kHz
Plastic Cable
dB Loss/kft
Paper Cable
dB Loss/kft
19 Gauge PIC (0
°
F)
19 Gauge PIC (70
°
F)
19 Gauge PIC (120
°
F)
0.5302
0.6083
0.6610
19 Gauge PULP (0
°
F)
19 Gauge PULP (70
°
F)
19 Gauge PULP (120
°
F)
0.5616
0.6415
0.6955
22 Gauge PIC (0
°
F)
22 Gauge PIC (70
°
F)
22 Gauge PIC (120
°
F)
0.912
1.0258
1.1015
22 Gauge PULP (0
°
F)
22 Gauge PULP (70
°
F)
22 Gauge PULP (120
°
F)
0.9454
1.0606
1.1370
24 Gauge PIC (0
°
F)
24 Gauge PIC (70
°
F)
24 Gauge PIC (120
°
F)
1.2571
1.3982
1.4917
24 Gauge PULP (0
°
F)
24 Gauge PULP (70
°
F)
24 Gauge PULP (120
°
F)
1.2900
1.4324
1.5268
26 Gauge PIC (0
°
F)
26 Gauge PIC (70
°
F)
26 Gauge PIC (120
°
F)
1.6751
1.8469
1.9608
26 Gauge PULP (0
°
F)
26 Gauge PULP (70
°
F)
26 Gauge PULP (120
°
F)
1.6823
1.8568
1.9718
