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OneExpert DSL User's Guide
22052280, Rev. 015 April 2019
Chapter 16 Appendix
277
- Verify that the Standard is correct (ADSL2+, G.DMT, Auto, etc.).
- Isolate premise wiring.
- Check for premise alarm system.
- Verify the copper pair is provisioned for ADSL at the CO.
- Test at the CO/Exchange on the customer pair.
- Check the DSLAM modem vendor and software version.
• The modem achieves sync with the CO, but the rate is lower than
expected – Check the loop length and attenuation. Long loops and high
attenuation will degrade DSL performance .
Make sure you are connected on the correct pins. For single-line service pins 4
and 5 are used on an RJ-45 connector. For bonded service, pair 1 should be on
pins 4 and 5 and pair 2 should be on pins 3 and 6 of an RJ45 connector. Check for
premise alarm system on the same pair.
Verify that the noise margin on the line is within acceptable limits. Noise margins
should typically be >= 6dB to allow for acceptable performance.
Data testing
• The IP ping menu says pings are being sent, but the network statistics are
not incrementing – Verify the IP address and netmask.
Make sure you are not behind a firewall; they can block ping responses from
reaching the host.
The IP ping function only
attempts to send a ping every second. Depending on
certain conditions, a physical ping packet may not be sent.
If IPoE standards require that the device has to ARP the address first. If this fails
eventually you will see a ARP HOST UNREACHABLE message.
Check to see that the destination IP address and your configured IP parameters
are correct.
Make sure that the Ethernet interface cabling is correct. If the Ethernet cable is
not hooked up, or is hooked up incorrectly, a packet will not be sent. Thus the
Ethernet statistics will not increment.