User guide

Link planning Chapter 2: Planning considerations
2-4
phn-2513_004v000 (Oct 2012)
Power supply considerations
Confirm that the planned site has a power supply that meets the following requirements:
• It is possible to remove power from the CMU and IRFU (if installed) without disrupting
other equipment, for example a circuit breaker.
• If the link is protected, it is possible to remove power from one PTP 800 without
disrupting the other PTP 800.
• Circuit breakers and switches are clearly labeled.
• Wiring from the power source to the PTP 800 is sized accordingly.
• All supply wiring conforms to national standards and best practice.
• A rack mounted power supply is grounded in accordance with national standards and
best practice.
For more information, refer to AC to DC converter specifications on page 4-4.
Provide a 4 Amp fuse or similar protection device between the –48 V dc supply source
and the PTP 800 CMU and IRFU (if installed).
Always ensure that the power supply is turned off before attempting any service on the
PTP 800 installation.
The CMU and IRFU (if installed) are positive ground and the DC power supply or battery
must also be positive ground or isolated.