SHDSL Power Feeding Hub

RAD’s PFH-4 SHDSL power feeding hub is a remote power-feeding hub designed especially to support long-range SHDSL applications. The PFH-4 SHDSL power feeding hub delivers power and data for up to four SHDSL wire-pairs (four x 2-wire lines or two x 4-wire lines), eliminating the need for local power sources for modems or repeaters on the line. The unit is especially practical in long range applications, such as those installed along rail lines or pipelines.

 

Typical applications include DSL links alongside highways, railways, pipelines, power lines, and waterways, as well as DSL transport to remote concentrators in rural or remote areas, and communication lines to military, construction or temporary field camps and sites.

• Extends range of SHDSL modems, increasing the number of reachable customers

• Reduces cost of laying power lines

Although SHDSL modems provide superior reach in comparison with other DSL technologies, the maximum range of standard SHDSL modems is still not sufficient for some longer range applications, such as those along railways or pipelines. In such cases, SHDSL repeaters are employed to duplicate and retransmit the signal.

To simplify deployment and save the cost of laying power lines, repeaters can operate on a remote power-feeding source. In other words, they can be powered over the same lines that carry the data traffic. RAD’s PFH-4 is a remote power feeding hub designed especially to support long range SHDSL applications. It delivers power and data for up to four SHDSL wire-pairs (four x 2-wire lines or two x 4-wire lines), eliminating the need for local power sources for modems or repeaters on the line.

 

The hub runs on 48 VDC power and can supply an output of 120 VDC or 180 VDC to each line. Each SHDSL wire-pair is input to the PFH-4, which then adds power to the original data signal. This power output feeds the repeaters on the line, which retransmit the data signal. Separate terminal block connectors are provided for easy connection of the input and output of each wire-pair.

All lines are protected from overload, short-circuiting and leakage to earth. At overload, a current-limiter drops the line, activates an LED alarm and initiates an auto-restart recovery.

 

Dry contacts relay major and minor alarm warnings via a DB-9 connector.

 

Front-panel LEDs indicate the power feeding status for each line and provide warnings for current and temperature overload conditions. An external DIP switch allows selective power feeding for each individual line.