Configure and View Status

Table 8. ADSL Transceiver Options (continued)

Type

For Option

Function

No.

 

 

 

 

 

3*

Max Down

Select a maximum data rate for the downstream channel

 

Data Rate

(from service provider to subscriber). Use the spacebar to

 

 

scroll through the available rates.

 

 

 

4

Startup SNR

Press the spacebar to select a startup SNR margin from

 

Margin

–3 to 9 dB or NA (don't care about startup SNR margin).

 

 

The default is 6 dB.

 

 

 

5

Margin

Type a dB value from 0 to 15. The Margin Threshold, in dB,

 

Threshold

is the excess SNR relative to the SNR at 10-7BER operation.

 

 

When the margin falls below the threshold, this causes an

 

 

SNR margin alarm and the MAR LED on the front panel to

 

 

blink. The default value is 4.

 

 

 

6

ES Threshold

Type in a value from 0 to 255 for the ES (errored second)

 

 

Threshold. If the current 15-minute interval ES exceeds the

 

 

set value, then this causes an ES alarm. The default is 100.

 

 

 

7

Alarm

Configure each alarm as either major or minor alarm or

 

Configuration

disable the alarm. Enabling alarms affects the ADSL STAT

 

 

LED, but not the alarm history. The available options for

 

 

each alarm are (E) for enabled minor alarm, (D) for disabled

 

 

alarms, and (M) for enabled major alarm.

 

 

Type 7 then press N until you highlight the alarm you

 

 

want to configure. Press the spacebar to toggle among the

 

 

choices listed above and press ENTER to select.

 

 

When you disable an alarm, it affects the system

 

 

ALARM/STATUS LED or alarm relays, but it does

 

 

not affect the reporting of alarm information in the

 

 

menu displays.

 

 

 

8

Transmit

Select downstream power option of either STANDARD

 

Spectrum

(default) or HI-PERFORMANCE. Unit uses the selected

 

 

option to set the upper limit of the downstream power

 

 

spectral density (PSD) during data transmission. PSD for

 

 

STANDARD is set to -40 dBm/Hz. PSD for

 

 

HI-PERFORMANCE is set to -34 dBm/Hz for frequencies

 

 

higher than 220 kHz.

 

 

 

*Certain data rate combinations are invalid. If such a combination is selected in fixed data mode, the modem will change the rates to a valid combination. When such a combination is selected in full startup mode, the modem accepts it, but the actual data rate to be achieved will not match the setting regardless of the line quality.

28

Megabit Modem CRA-C User Manual