Tx/2W (Right Key); Rx (Left Key); Rx (Middle Key); Rx Right Key) - AMERITECH AM5 Instruction Manual

AM5(e) Classic Instruction Manual
3.3.22 TX/2W (left key): This key selects, in rotation, the impedance of the output of the
AM5(e) Classic SEND functions at the TX/2W jack (and rear-panel T and R
terminals) when the LINE selector (3.3.27) is set for any position but 4W REV(erse).
When in the LINE selector is in 4W REVerse position, the selected impedance is for
output at the TX REVERSE jack (and rear-panel T1 and R1 terminals).
• 600 ohm is the default.
3.3.23 TX/2W (right key): This key is an alternate-action key which connects a holding coil
equivalent (DC path of about 200Ω) to the TX/2W circuit while maintaining an AC
impedance of greater than 50 KΩ.. When OFF HOOK, the holding coil is across the
TX/2W tip and ring terminals. When ON HOOK, the holding coil is disconnected.
• ON HOOK (OFF HOOK not lighted) is the default.
3.3.24 RX (left key): This key selects, in rotation, the impedance of the input of the AM5(e)
Classic for MEASURE functions at the RX (and rear-panel T1 and R1 terminals)
when the LINE selector (3.3.27) is set to 4W.
When the LINE selector is in 4W REVerse position, the selected impedance is for
input at the RX REVERSE jack (and rear-panel T and R terminals).
When the LINE selector is in either 2W position, the measure section presents high-
impedance (> 50 KΩ) to the TX/2W jack.
• 600 ohm is the default.
The TERMinating function must be active for any impedance setting to apply (see
sub-section 3.3.26).
3.3.25 RX (middle key): This key is an alternate-action key which connects a holding coil
equivalent (DC path of about 200Ω) to the RX circuit while maintaining an AC
impedance of greater than 50 KΩ.. When OFF HOOK, the holding coil is across the
RX tip and ring terminals. When ON HOOK, the holding coil is disconnected.
• ON HOOK (OFF HOOK not lighted) is the default.
3.3.26 RX right key): This key selects, in rotation, a termination with the selected
impedance (TERMinate lighted) or a high-impedance (> 50 KΩ) bridging impedance
(BRDG lighted). This key has no effect on RX functions when the LINE selector is in
a 2W position.
• TERMinate is the default.
November 19, 1997
(18-0047)
Page 3-13
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