Nortel Networks 1000 - Manual (Page 841)

Architecture 841
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 which conform to the 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 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.
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 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.