Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL VF-8A RFL Electronics Inc.
August 6, 2010 10 (973) 334-3100
11. DIP switches SW4, SW5 and SW6 are used to select the 3-digit Station ID. Values from 000 to
899 are legal. Group number 9 is reserved.
Set SW4 to the desired group number (100’s position) between 0 and 8.
Set SW5 to the desired (10’s position) between 0 and 9.
Set SW6 to the desired (units position) between 0 and 9.
For example, to select a Station ID of 347, set SW4 to 3, SW5 to 4, and SW6 to 7. This Station
ID belongs to group number 3.
12. Set DIP switch SW7-6 enable or disable signaling delay.
Place SW7-6 in the UP position to enable signaling delay.
Place SW7-6 in the DOWN position to disable signaling delay.
13. Set DIP switches SW7-7 and SW7-8 to select the desired Busy Circuit option in accordance
with Table 5.
14. Select the Tx and Rx audio levels using DIP switches SW8-2 through SW8-8, and SW9-2
through SW9-8, in accordance with Table 6. These switches are used to alter the translation
between analog signal levels and digital data.
The factory default level setting is 0 dBm IN and -6 dBm OUT (refer to Table 6). The input
level setting was selected because high-level tones are generally produced by standard DTMF
phones. The output level setting was selected so that a comfortable voice level is received at
the local phone earpiece. It is recommended that these default settings be used.
The following information is useful if the level must be adjusted:
The switches are binary coded with a minimum step size of 0.5 dB. An offset of 32 dB is
included to allow the signals to be attenuated or amplified. Table 6 shows the switch settings
for both the Tx and Rx level adjustments. The table only includes full dB steps for clarity.
Adjustments can be made in 0.5 dB increments by changing switch position 8 on the
appropriate switch. A Tx or Rx level can be set 0.5 dB lower by placing switch SWX-8 to the
UP position. For example, to set -25.5 dB, set SWX-2 through SWX-8 as follows:
U, U, U, D, D, U, U. Note that the level used to determine the switch setting should allow for
the maximum anticipated signal, or clipping may occur.
The RFL VF-8A is now installed. If your multiplexer is set up for remote access and control, you can
now change the operating parameters of the module by using simple commands. For more information
on remote access and control, consult your multiplexer instruction manual.
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