Tahoe 684 User Manual - Keyboard and Lcd
4
3.
Modem configuration using built-in
keyboard and LCD
The easiest way to configure a modem is to use the four-button
keyboard and the LCD. After switching the power on, an information
about the modem type, the line throughput and state will be displayed:
Four-letter code on the right describes the DSL line state:
¡
B (BOOT) - booting, loading firmware to the G.shdsl transceiver
¡
I (IDLE)
- transceiver is idle
¡
A (ACTV) - waiting for signal from remote modem
¡
0...9 (BP 0...BP9) - subsequent stages of negotiation
¡
F (FRAM) - framer synchronization
¡
S (SYNC) - line is synchronized, modem is transmitting data
¡
D (DEAC) - signal lost, connection will be terminated
¡
W (WAIT) - waiting before another synchronization attempt
On the right of the display there is a keyboard with “up”, “down”,
“Escape” and “Enter” keys. By pressing up/down buttons you may
browse the configuration menu:
¡
speed setting
¡
modem type setting (Master/Slave)
¡
line modulation selection
¡
storing settings in the EEPROM memory
¡
setting the IP address and network mask on the eth0 interface
¡
selection of the language
¡
connection reset
¡
modem reset
¡
bridge mode toggling
Each pressing of the “Escape” button causes the return to the
primary display with modem type and state. Pressing of the “Enter”
button selects given menu option.
3.1.
Throughput setting
5
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.
Modem type
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.
Line coding
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.
3
Tahoe 684
35`C
19456 kb/s
BBBB
Line rate:
9728 kb/s
Line coding:
32-TCPAM
Modem type:
Master / HTU-C