Line Coding - Tahoe 684 User Manual

After pressing Enter the throughput may be set using up/down
buttons. It may be chosen from 256-19456 kbps range with 256 kbps
step. The actual throughput of each line is 1/4 of the throughput
displayed. Different rates for each line may be set using the serial
console or the telnet connection (see chapter 4).
After choosing the right speed and pressing Enter modem will
reset the connection and renegotiate it with new settings.
NOTE: The same throughput must be set on both modems.
3.2
3.2.
After pressing Enter the modem type may be selected - either
Master (HTU-C) or Slave (HTU-R). After selecting the type and pressing
Enter again the connection will be reset and renegotiated with new
settings.
NOTE: Always one modem has to be set as a Master and the
other one as a Slave.
3.3
3.3.
After pressing Enter the G.shdsl line coding (signal modulation)
may be chosen. The number (32 in the example above) means the
number of values encoded in one symbol (32 - 5 bits per symbol). The
higher this number is, the lower is the signal frequency, which gives
better immunity for signal attenuation and higher reach.
The second part - PAM or TCPAM - means either the Pulse
Amplitude Modulation or Trellis Coded Pulse Amplitude Modulation.
The latter is more efficient.
It is recommended to use the 32-TCPAM modulation, which
provides the best results. The remaining line codings are available to
provide compatibility with others' manufacturers equipment. Moreover
32-TCPAM allows throughputs from 256 kbps to 4864 kbps per line,
while 16-TCPAM - from 64 kbps to 2304 kbps.
Modem type
Modem type:
Master / HTU-C

Line coding

Line coding:
32-TCPAM
5