Positron Power

a) It could be T1 circuit needing a different isolation card (751329 or 7501-06A).
b) A short-circuit on the loop.
c) Wrong sealing current setting (loop or simplex).
d) Crosstalk on the loop from the isolated pair coming from the CO side.

How can span power be regenerated on the station side?

A- The HDSL card cannot pass the DC current to the station side. The station equipment should be powered locally. If the equipment must be powered through the Teleline card, a 4-wire DX signaling setup must be installed. To do so, the following is required:

•Two 751340 2-wire HDSL cards
•One 7501-16 OPX card to feed the DC
•One 7501-40 holding coil to reinsert the DC

Or:

•One 751339R3
•Two 751340R3

For more information on how to install this setup, refer to the installation guide on the holding coil 7501-40.

** Resolution of a problem is made easier with a 751366 line test card. It is recommended to have one per site to make measurements easier. If you do not have one, troubleshooting is still possible, but more difficult for the technician.