AM79C202 Legerity, AM79C202 Datasheet - Page 11

• Manufacturer Part Number: AM79C202
• Description: (AM79C202 / AM79212) PCM CODEC
• Manufacturer: Legerity

The PCM data can be either 8-bit companded A-law or
µ-law code. Voice and control data are read or written
to the digital interface in channels that are pin strap com-
patible.
Besides the CODEC functions, the ASLAC device pro-
vides all the sensing, feedback, and clocking neces-
sary to completely control ASLIC device functions with
programmable parameters. System-level parameters
under programmable control include active and disable
loop-current limits, feed resistance, and apparent bat-
tery-feed voltage. The longitudinal operating point is
programmable to optimize the ASLIC device signal
swing capability.
ASLIC/ASLAC Products
The ASLAC device provides signals at 12 or 16 kHz for
metering functions. The frequency and level of these
signals are programmable.
The ASLAC device provides extensive loop supervision
capability, including off-hook, ring-trip, and ground-key
detection. Detection thresholds for these functions are
programmable. A programmable debounce timer is
available that eliminates false detection due to contact
bounce. For subscriber line diagnostics, AC and DC line
conditions can be monitored using special test modes.
Results are sent upstream over the control interface.
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