Revision 01
June 2, 1997
Section 363-719-102
PG-Flex FCS-719
PairGain Engineering - Plant Series
Page 19
C. INSTALLATION AND TEST
5. Unpacking
5.1
Upon receipt of the equipment:
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 against the packing list to ensure complete and accurate shipment. If the
shipment is short or irregular, contact PairGain as described in Section 12. If you must store the
equipment for a prolonged period, store the equipment in its original container.
6. Pre-Provisioning—HDSL Lines
6.1
The HDSL transmission scheme uses two pairs between the COT and RT. 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.
6.2
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.
6.3
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 distance between the COT and the RT. Table 15 identify these distances
(at a cable temperature of 68°F):
Table 15. 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
