BroadBand reference Guide - Blonder Tongue Laboratories Inc.

SMI Installation
Passing Power to the Home
Some 750 MHz SMI units and subscriber modules are capable of
passing 37-90 VAC power to each subscriber port. This capability
provides power to a telephony or data network interface unit
(NIU)/customer interface unit (CIU).
• If a CIU is not in the home: Make sure during installation that
power is not present at the subscriber port. Use the proper 750
MHz housing/power supply/subscriber module combination so as
not to pass power.
• If a CIU is in the home: Power passes from the subscriber port to
the CIU, so install the optional power passing jumper P/N 568839
in the direction indicated on the subscriber module P/N 564265.
Passing Power to Unused Feeder Ports
If 750 MHz housing is
equipped with a...
non-power passing
power supply
power passing
power supply
CAUTION
you install a sub module.
• Tamper 1 Flash
• Refresh Timer 2 Flashes
• VCO Failure 4 Flashes
89
You can use...
any subscriber module.
P/N 564265 (without optional power
passing jumper installed), or P/N
566024 (no power passing capability).
If no CIU is present at the subscriber drop, do not
install a power passing subscriber module in a
750 MHz housing equipped with a power passing
power supply or severe damage to the subscribers
TV or VCR may result.
SMI Troubleshooting
Diagnostics
The SMI unit has factory default parameters that immediately
activate all ports upon initial installation. There are no jamming
frequencies assigned at the factory. This allows the full spectrum of
channels to pass, “in the clear,” to the subscriber drop port once