Cept Transceiver - Avaya Nortel Communication Server 1000 Reference

carrier cable shield. The switch settings are shown in
settings on page 529. The switch should be kept in "ON" position.
Table 233: Carrier shield grounding switch settings
Switch
S4-1
S4-2
Receiver functions
The receiver extracts data and clock from an AMI (Alternate Mark Inversion) coded signal and
outputs clock and synchronized data. The receiver is sensitive to signals over the entire range
of cable lengths and requires no equalization. The clock and data recovery meets or exceeds
the jitter specifications of the CCITT recommendation G.823, and the jitter attenuation
requirements of the CCITT recommendation G.742. This provides jitter 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 also 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.
Circuit Card Reference
Carrier Pair
Rx shield
Tx shield
Table 233: Carrier shield grounding switch
On
Open GND
Open GND
Architecture
Off
July 2011 529