Справочник Пользователя для EMS Technologies Canada Ltd. HSD-X

Before proceeding with the installation of the HSD transceiver, read all cabling notes 
provided on the HSD System Interconnection Diagram for the applicable HSD system 
operational mode.

(1) HSD Transceiver Cabling

When installing the HSD transceiver, follow the cabling requirements listed below:

•

Maximum recommended cable length should not exceed 50 feet. 

•

LAN cables must meet flammability, TIA/EIA568-A CAT 5 requirements, and 
conform to ARINC 628 specifications. 

•

Wire size recommendations:

•

For +28 V dc HOT (BP2), +28 V dc RTN GND (BP3), 115 V ac COLD (BP7), 
and Chassis GND (BP8), use 12 AWG

•

For 115 V ac HOT (BP1), use 20 AWG

•

Unless otherwise specified, for signaling use 22 AWG wire.

(2) HSD-X Transceiver Cabling

When installing the HSD-X transceiver in Multi-Channel Configurations, follow the 
cabling requirements listed below:

•

For 115 V ac HOT (BP2), use 20 AWG

•

For 115 V ac COLD (BP4), use 20 AWG 

•

Chassis GND (BP3), use 14 AWG

(3) HSD Transceiver Coaxial Cable Loss Considerations

When installing HSD transceivers, consider the following coaxial cable loss 
requirements:

•

: Maximum loss is 2.5 dB including DLNA (typically <0.8 dB) as 

per ARINC 741. In installations that use a high power relay, the high power relay 
loss must be included.

•

: For HSD transceivers operating in Stand-Alone, Cooperative, and 

Combined Mode installations, the minimum loss is 6 – 25 dB (including any in-line 
attenuator) as per ARINC 74. For HSD-128 and HSD-X transceivers installed in 
Multi-Channel Configurations, the minimum loss is 0 – 19 dB (including cables 
and splitters).