Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
VF-16B LOOPBACK MODES
The VF-16B has four loopback modes. Each of these is described below. Refer to Figure 7 for a
pictorial description of loopback modes. See page 25 for more information on NMS. See page 26 for
more information on SCL commands.
Digital Loopback
Digital loopback turns around data received from the bus, and transmits it right back onto the bus. The
near end phone will still receive the signal from the bus. This is done in the digital section of the SLIC.
This loopback can be activated at the near end by switch, NMS, or SCL commands.
Analog Loopback
Analog loopback exercises the VF-16B up to the SLIC’s analog section. The phone connected directly
to this channel will be looped onto itself. The near end phone will still transmit to the far end receiving
equipment. This loopback can be activated at the near end by switch, NMS, or SCL commands.
Full Analog Loopback
Full analog loopback exercises the VF-16B up to the SLIC’s digital section. The phone connected
directly to this channel will be looped onto itself. The near end phone will still transmit to the far end
receiving equipment. This loopback can be activated at the near end by switch, NMS, or SCL
commands.
Dual Analog Loopback
Dual analog loopback connects the phone on channel one to the phone on channel two. This is done at
the FPGA logic IC. If ARD is selected on for both channels, the phone will ring if the other is picked
up. If only one channel has this loopback enabled it will eavesdrop on the other channel, while the
other channel functions normally. The near end phones will still transmit to the far end receiving
equipment. This loopback can be activated at the near end by switch, NMS, or SCL commands.
15. Enable or disable Automatic Ringdown (ARD) on Channel 2 by using DIP switch SW9-4.
Place SW9-4 in the OFF position for normal operation, or in the ON position for
ARD operation. Unless otherwise specified at time of order, SW9-4 is set in the
OFF position at the factory.
16. Select the Loopback Mode by using DIP switches SW10-1 and SW10-2.
The four types of Loopback that can be selected are Analog, Full Analog, Digital
and Dual Analog. Refer to Table 6 to determine how the switches are set for each
of these modes. Unless otherwise specified at time of order, SW10-1 and SW10-2
are set in the UP position at the factory to select Analog Mode. The Loopback
mode selected must be enabled or disabled by completing steps 17 and 18.
17. Enable or disable Channel 1 Loopback by using DIP switch SW2-8.
Place SW2-8 in the UP position to disable Channel 1 Loopback, or in the DOWN
position to enable Channel 1 Loopback. Unless otherwise specified at time of
order, SW2-8 is set in the UP position at the factory.
>> Text continues on page 20 <<
RFL VF-16B RFL Electronics Inc.
January 17, 2007 17 (973) 334-3100
To Next Page
Loading...