EMS Technologies Canada Ltd. HSD-X ユーザーズマニュアル
Page 3–60
18 September 2007
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
(a) Multi-Channel Coaxial Cable Loss Considerations – Multi-Channel
When installing a Multi-Channel HSD configuration, the transmit loss between
the HSD-X slaves and the HSD-128 master must be considered. This loss, taking
into consideration the cables, the combiner, and the attenuator, should come as
close as possible to 29.5 dB (as shown in Table 3–32). For an illustrated example,
refer to Figure 3–17.
the HSD-X slaves and the HSD-128 master must be considered. This loss, taking
into consideration the cables, the combiner, and the attenuator, should come as
close as possible to 29.5 dB (as shown in Table 3–32). For an illustrated example,
refer to Figure 3–17.
Note:
The installer should try to achieve 29.5 dB loss; ± 3 dB for all HSD-X slaves.
(See Figure 3–17.) The loss is generally referred to as “HSD-X cable loss”,
even though it includes the combiner and attenuator.
(See Figure 3–17.) The loss is generally referred to as “HSD-X cable loss”,
even though it includes the combiner and attenuator.
Figure 3–17. HSD-X Coax Cable Loss
After installation, the actual calculated (or measured) loss between each HSD-X
and the HSD should be included in the HSD-128 ORT or EEPROM configuration.
and the HSD should be included in the HSD-128 ORT or EEPROM configuration.
Table 3–32. Coax Cable Losses – Multi-Channel
Item
Loss (dB)
Cable, HSD-X to combiner
3
Combiner
3.5
Cable, combiner to attenuator
2
Attenuator
20
Cable, attenuator to HSD-128
1
Total:
29.5