Nortel-networks Circuit Card Manual do Utilizador Página 794

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Page 794 of 906 NTCK16 Generic Central Office Trunk cards
553-3001-211 Standard 3.00 August 2005
provide 4 dB dynamic attenuation pads on a per call basis
allow individual units or the entire board to be disabled by software
provide software selectable A-law or µ-law companding
indicate self-test status during an automatic or manual self-test
provide card-identification for auto configuration, and for determining
the serial number and firmware level of the card
convert transmission signals from analog-to-digital and from
digital-to-analog
provide termination and trans-hybrid balance impedance to match
600 Ω.
Operation
Each NTCK16AX and NTCK16BX generic Central Office trunk card
supports the following:
Loop start operation
Battery reversal detection
Busy tone detection and supervision
Loss Switching
Trunk-to-Trunk connections
Call Disconnect
In addition, the NTCK16AX circuit card supports internal 12/16 kHz PPM
detection.
Loop start operation
Loop start operation is configured in software and is implemented in the card
through software download messages.
Idle state
In the idle state, the ringing detector is connected across the tip and ring wires,
providing a high impedance loop toward the Central Office.
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