Nortel Networks Circuit Card 311 - Manual (Page 983)

Architecture 983
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 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.
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. This conforms to CCITT
recommendation G.703 pulse shape.
The transmitter takes the binary (dual unipolar) data from the PCM
transceiver and produces bipolar pulses which conform to CCITT
recommendation G.703 pulse shape.
The transmitter takes the binary (dual unipolar) data from the PCM
transceiver and produces bipolar pulses. This conforms to CCITT
recommendation G.703 pulse shape.
Loopbacks
The remote loopback function causes the far-end device to transmit the
same data that it receives, using the jitter attenuated receive clock. The data
is additionally available at the far-end receive data outputs. Local loopback
causes the transmit data and clock to appear at the near-end clock and
receive data outputs. This data is also transmitted on the line unless an
Alarm Indication Signal (AIS) is transmitted instead.
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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.