5
61433105L1-5F
Section 61433105L1, Issue 6
Loopback Pushbutton (Remote Unit)
The DDS-DP initiates a loopback in response to a
remote unit with a loopback pushbutton feature,
Figure 6
. This allows a field technician or craft
personnel to conduct loop testing from the remote end
independent of the test center or CO.
5. DEPLOYMENT GUIDELINES
The DDS-DP and DDS-R use technology designed to
eliminate the need for repeaters and concerns over
impairments caused by typical noise and bridged tap.
Listed below are the loop design guidelines for Total
Reach DDS. See
Table 4
and
Table 5
for more
information.
• All loops must be nonloaded.
• Actual Measured Loss (AML) should not exceed
50 dB at 13.3 kHz (135
Ω
termination), the
Nyquist frequency of Total Reach DDS.
Table 4. Cable Type and Temperature Loss Data @ 13.3 kHz
NOTE
The 50 dB AML limit includes 6 dB of signal
margin to account for potential near-end cross
talk (NEXT) from other digital services that
may be provisioned in the same binder group.
•
Loop length should not exceed 50 kft.
•
Bridged tap length should not exceed 12 kft.
•
Background noise level should not exceed
34 dBrn.
•
Impulse noise should not exceed
-40 dBm, (+50 dBrn).
NOTE
Measure noise with 50 kbit weighting
characteristic approximating a filter with a
passband of 40 Hz to 30 kHz. Background noise
level or impulse noise level is referenced from
56/64 kbps data rate in TR62310.
Table 5. DDS Insertion Loss Measurements
Figure 6. DDS-DP Response to DDS-R ACE
Loopback Button
Test
Unit
(example)
DDS-R ACE
Series 5
DDS-DP
Loopback Button
Loopback
Toward Customer
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1
