Widearea VER-1P, Руководство по установке, Страница: 6 / 10

3.2. Resistance and distance demand
The recommended installation conditions are as follows.
（
1
）
26 AWG twist pair
Table 3 -The demand about resistance and distance:
Route
20
℃
loop resistance
(
Ω
)
Distance demand
Kft Km
L1
348 ~522 3.6 ~ 6.0 1.2 ~1.8
L2
87 ~ 435 1.0 ~5.0 0.3 ~ 1.5
L(L1+L2)
435 ~ 870 5.0 ~10.0 1.5 ~ 3.0
（
2
）
24 AWG twist pair
Table 4 -The demand about resistance and distance:
3.3. Switches setting
There are 2 switches, one is labeled “Up”, another is labeled “Down”. They are all two-bits
switch, explained as fellows.
When L2 is longer, both bits of “Up” switch should be set to “high” position, and when L2
shorter, both bits be set to “low” position. The demarcation point is about 1.0 Km for AWG 26
cable, or about 1.2 Km for AWG 24 cable.
When L1 is longer, both bits of “Down” switch should be set to “high” position, and when L1
shorter, both bits be set to “low” position. The demarcation point is about 1.7 Km for AWG 26
cable, or about 2.1 Km for AWG 24 cable.
With real cable, considering the ageing, you can check which position (high or low) should be
set, for the two switches (Up or Down), by reading the line bit-rate on VDSL Modem, or on
DSLAM. High line bit-rate is available, by setting the “Up” switch and “Down” switch to their
respective right positions, two bits of any one switch must be on same position.
Route
20
℃
Loop Resistance
(
Ω
)
Distance Demand
Kft Km
L1
258 ~ 395 5.0~7.6 1.5~2.3
L2
60 ~ 326 1.2~6.3 0.35~1.9
L(L1+L2)
326 ~ 653 6.3~12.6 1.9~3.8