User's Manual

Table Of Contents
Page 3–8
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
B. Cabling Notes
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:
Transmit cable: 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.
Receive cable: 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).