Signalling Frequency Skip (Sf Skip); Single Frequency Tones (F1, F2, F3, F4); General Information - AMERITECH AM5 Instruction Manual

AM5(e) Classic Instruction Manual
9.5

SIGNALLING FREQUENCY SKIP (SF SKIP)

The SF SKIP is used to avoid sending tones in the "signalling frequency" band that
could interfere with other equipment. SF SKIP is an ON/OFF toggle that is affects the
VAR Hz or SWEEP functions.
When SF SKIP is ON (LED lighted), the VAR Hz generator cannot be set to send
frequencies in the rejection band. If a frequency is set in the band while SF is OFF, the
frequency will be reset to the upper or lower limit of the rejection band when SF SKIP is
turned ON. The frequency will not be reset when SF SKIP is turned OFF.
When SF SKIP is ON, the SWEEP generator start or stop frequencies cannot be set (or
remain) within the rejection band. If the SWEEP range includes the SF SKIP rejection
band, those frequencies will not be output. The rejection band is different for the AM5
and AM5e Classic.
QUIET Frequencies (F1, F2, F3, or F4) can be set within the rejection band when SF
SKIP is ON. This allows the user to momentarily overide the SF SKIP band to send
control tones.
9.5.1 SF SKIP Rejection for AM5 Classic: The rejection band for the
AM5 Classic is 2450 Hz through 2750 Hz to conform to
IEEE standards.
9.5.2 SF SKIP Rejection for AM5e Classic: The rejection band
for the AM5e Classic is 2130 Hz through
2430Hz to conform to CCITT standards.
9.6

SINGLE FREQUENCY TONES (F1, F2, F3, F4)

9.6.1 General Information: The single-frequency tones are
selected by pressing the right SEND key until the LED
for the tone is flashing. Once the LED is flashing, the tone
may be output by pressing and holding the right SEND
key for three seconds until the LED is steady. The tone is
stopped by pressing and releasing the SEND key.
The single-tone over-rides any other SEND function. If a
SWEEP frequency is being generated, the SWEEP is reset to its
starting frequency after the tone is stopped.
9.6.2 The single-tone may also be over-ridden by pressing any of the left SEND keys.
For example, if an F4 tone is being output, shifting from QUIET to 1004Hz will
automatically stop the F4 tone and send the 1004 Hz tone.
The frequency labels on the front panel are the defaults that have been chosen
for various control or test purposes and are different for the AM5 and AM5e
Classic. Frequencies and level may be changed when QUIET is selected, refer to
9.1.
One use of a single-frequency tone is to command a remote device into loopback
mode. This is described in the next sub-section
November 19, 1997
(18-0047)
Page 9-8
SEND FUNCTIONS
SF
SKIP
F4
2713Hz
F3
2804Hz
F2
1004Hz
F1
404Hz
AM5 Classic
F4
3004Hz
F3
2004Hz
F2
1004Hz
F1
304Hz
AM5eClassic