Maintenance; Table 3. Loop Insertion Loss Data - ADTRAN T200 Installation And Maintenance Manual

Recommended maximum local loop loss information
for PIC cable at 70° F and 135 Ω resistive termination
is provided in Table 3.

Table 3. Loop Insertion Loss Data

Frequency
(Hz)
3,000...................
10,000..................
50,000..................
100,000..................
150,000..................
200,000..................
250,000..................
325,000..................
An approximation for the maximum amount of
wideband noise on a DSL local loop as measured by a
50 kbps filter is ≤31 dBrn.
An approximation for the maximum level of impulse
noise as measured using a 50 kb filter on an DSL loop
is ≤50 dBrn.
NOTE
These approximations are to be used as guidelines
only and may vary slightly on different loops.
Adhering to the guidelines should produce
performance in excess of 10
4
Maximum Loss
(dB)
12.0
15.0
25.5
30.0
32.75
35.25
37.25
42.00
-7 BER.
61246041L3-5, Issue 1

5. MAINTENANCE

The ADTRAN Low Voltage HRE requires no routine
maintenance. In case of equipment malfunction,
perform an in-band loopback from the central office
(CO), as defined in Appendix A. If a malfunction is
confirmed, replace the HRE.
The HRE has looping capability through the channel
allowing digital loopback in fault isolation. The
looping is accomplished remotely from the CO switch
as defined in the table in Appendix A.
Performance monitoring, diagnostics, and loopbacks
are also available from the craft interface at the
HTU-C and HTU-R.
When testing indicates a faulty circuit pack, refer to
the housing installation/maintenance practice for the
entry and pressurization control, then replace the
faulty circuit pack.
An in-band loopback test can be performed from the
CO (see Appendix A).
ADTRAN does not recommend field repair of the
circuit pack. Repair services may be obtained by
returning the defective unit to the ADTRAN Repair
Department.
61246041L3-5A