Section 363-718-100
Revision 01
Page 10
C. INSTALLATION AND TEST
7. UNPACKING
7.01
Upon receipt of the equipment, proceed as
follows:
1.Unpack each container and visually inspect
it for signs of damage. If the equipment has
been damaged in transit, immediately report
the extent of damage to the transportation
company and to PairGain. Order
replacement equipment if necessary.
2.Check the contents versus the packing list
to ensure complete and accurate shipment.
If the shipment is short or irregular, contact
PairGain as described in Section 4. If you
must store the equipment for a prolonged
period, store the equipment in its original
container.
8. PRE-PROVISIONING—HDSL LINES
8.01
The HDSL transmission scheme uses two
pairs between the COT and RT. For
convenience, the wire pairs should have identical
electrical make-ups. Differences in total wire length,
wire gauge, bridge taps, and exposure to crosstalk
should be kept to a minimum. Pair isolation, tip-ring,
tip-ground, and ring-ground, must be
≥
100 kohms.
8.02
The wire pairs from the COT to the RT must
meet the following design guidelines:
•
Nonloaded cable only.
•
Multigauge is restricted to two gauge
changes, except for stubbing or fusing.
•
Total bridge taps may not exceed 2.5 kft.
No single bridge tap may exceed 2.0 kft.
8.03
The distance limitation for HDSL transmission
is based on a maximum signal attenuation of
35 dB. Since signal attenuation decreases as cable
size increases, the larger the gauge (i.e., 19 AWG vs.
26 AWG), the greater the length. Tables 11 and 12
identify these distances (at a cable temperature of
68°F):
Table 11. 12/24 Channel HDSL Transmission
Distance
Gauge
Loop Length
Resistance
19 AWG
0.9 mm
22.8 kft
7.0 km
367
Ω
22 AWG
0.6 mm
16.1 kft
4.9 km
521
Ω
24 AWG
0.5 mm
12.3 kft
3.7 km
638
Ω
26 AWG
0.4 mm
9.0 kft
2.7 km
750
Ω
Table 12. 16/32 Channel HDSL Transmission
Distance
Gauge
Loop Length
Resistance
19 AWG
0.9 mm
19.4 kft
5.9 km
312
Ω
22 AWG
0.6 mm
13.7 kft
4.2 km
444
Ω
24 AWG
0.5 mm
10.7 kft
3.3 km
554
Ω
26 AWG
0.4 mm
8.1 kft
2.5 km
672
Ω
