User`s manual

P-660 Series Support Notes

it will not catch up with telephone lines for many years. Additionally, many of the

older cable networks are not capable of offering a return channel; consequently, such

networks will need significant upgrading before they can offer high bandwidth

services.

2. What is the expected throughput?

In our test, we can get about 1.6Mbps data rate on 15Kft using the 26AWG loop. The

shorter the loop, the better the throughput. Besides, please do not stay in menu 24.1 it

will slow down the throughput.

3. What is the micro filter used for?

Generally, the voice band uses the lower frequency ranging from 0 to 4KHz, while

ADSL data transmission uses the higher frequency. The micro filter acts as a low-pass

filter for your telephone set to ensure that ADSL transmissions do not interfere with

your voice transmissions. For the details about how to connect the micro filter please

refer to the user's manual.

4. How do I know the ADSL line is up?

You can see the DSL LED on the P-660's front panel is on when the ADSL physical

layer is up.

5. How does the P-660 work on a noisy ADSL?

Depending on the line quality, the P-660 uses "Fall Back" and "Fall Forward" to

automatically adjust the date rate.

6. Does the VC-based multiplexing perform better than the LLC-based

multiplexing?

Though the LLC-based multiplexing can carry multiple protocols over a single VC, it

requires extra header information to identify the protocol being carried on the virtual

circuit (VC). The VC-based multiplexing needs a separate VC for carrying each

protocol but it does not need the extra headers. Therefore, the VC-based multiplexing

is more efficient.

7. How do I know the details of my ADSL line statistics?

You can use the following CI commands to check the ADSL line statistics.

CI> wan adsl perfdata

CI> wan adsl status

CI> sys log disp