Instruction manual

160
Circuit Packs and Power Supplies
Equipment Numbers and Description
May 2003
TN744E Call Classifier and Tone
Detector (8 ports)
The TN744 call classifier and tone detector circuit pack has eight ports of tone detection on the
TDM bus. The TN744 circuit pack does not support call progress tone generation or clocking.
The tone detectors are used in vector prompting, outgoing call management (OCM), and call
prompting applications in the United States and Canada and call classifier options for various
countries.The TN744 detects special intercept tones used in network intercept tone detection in
OCM. The TN744 circuit pack also detects tones when a CO answers a call.
The TN744 circuit pack provides tone generation and detection for R2-MFC DID signaling that
is used in non-United States installations. The TN744 circuit pack also allows gain or loss to be
applied to pulse code modulation (PCM) signals that are received from the bus and supports
A-Law and µ-Law companding. The TN744 circuit pack detects 2025-Hz, 2100-Hz, or
2225-Hz modem answerback tones and provides normal broadband and wide broadband dial
tone detection.
The TN744 circuit pack supports digital signal processing of PCM signals on each port to
detect, recognize, and classify tones and other signals. Generation of signaling tones is also
supported for applications such as R2-MFC, Spain MF, and Russia MF. Gain or loss and
conferencing can be applied to PCM signals received from the TDM bus. Additional support
includes DTMF detectors to collect address digits during dialing, and A-Law and µ-Law
companding.
In normal operation, a port on the TN744 circuit pack can serve as an incoming register for
Russia MFR (multi-frequency shuttle register signaling). Use the TN744 with the TN429C
analog line central office trunk for CAMA/E911.
TN746B Analog Line (16 ports)
The TN746B analog line circuit pack has 16 ports. Each port supports one telephone. Auxiliary
equipment such as FAX machines, answering machines, modems, and amplifier handsets is
supported.
The TN746B circuit pack supports on-premises building wiring with either touch tone dialing
or rotary dialing and with or without the LED and neon message waiting indicators. The
TN746B circuit pack supports off-premises wiring (out-of-building only with certified
protection equipment) with either DTMF dialing or rotary dialing. LED or neon message
waiting indicators are not supported off-premises. The TN746B circuit pack provides -48 V DC
current in the off-hook state. Ringing voltage is -90 V DC.
The TN746B, along with a TN755B neon power unit per carrier or per single-carrier cabinet,
supports on-premises telephones that are equipped with neon message waiting indicators. The
TN746B circuit pack supports three ringer loads, only one telephone can have an LED or neon
message waiting indicator.