Cept Transceiver; Slip Control; D-Channel Support Interface - Nortel Enterprise 1000 Reference Manual

attenuation increasing from 0 dB to 60 dB over the frequency range from
about 6 Hz to 6 KHz.
Transmitter functions
The transmitter takes the binary (dual unipolar) data from the PCM
transceiver and produces bipolar pulses which conform to the CCITT
recommendation G.703 pulse shape.
Loopbacks
The remote loopback function causes the device to transmit the same data that
it receives, using the jitter attenuated receive clock. The data is additionally
available at the receive data outputs. Local loopback causes the transmit data
and clock to appear at the receive clock and data outputs. This data is also
transmitted on the line unless transmit AIS is selected.

CEPT transceiver

The transmitter and receiver functions are used for synchronization, channel,
and signal extraction. The functions meet applicable specifications of the
CCITT recommendation G.703 and G.732.
The transceiver provides transmit framing based on the 2.048 MHz clock
derived from the DS-30X system clock and 1 KHz framing pulse.

Slip control

Slip control provides organized recovery of PCM when the clock recovered
from the external facility is at a different frequency than the local clock.

D-channel support interface

The D-channel support interface is a 64 Kbps, full-duplex serial bit stream
configured as a DCE device. The data signals include:
• Receive data output
• transmit data input
• receive clock output
• transmit clock output
The receive and transmit clocks have slightly different bit rates from each
other, as determined by the transmit and receive carrier clocks.
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