ZyXEL Communications IES-1248-51 - DSL Data Transmission; There Is no Voice on an ADSL Connection; Table 108 DSL Data Transmission Troubleshooting; Table 109 ADSL Voice Troubleshooting

IES-1248-51/51A/53 User’s Guide
Chapter 58 Troubleshooting 433
58.6 DSL Data Transmission
The DSL link is up, but data cannot be transmitted.
58.7 There Is No Voice on an ADSL Connection
The IES-1248 has internal POTS (Plain Old Telephone Service) splitters and CO side Telco-
50 connectors that allow the telephone wiring used for ADSL connections to also
simultaneously carry normal voice conversations.
4 Ping the IES-1248 from a computer behind the peer Ethernet device.
5 If you cannot ping, check the Ethernet cable and connections between the Ethernet port
and the Ethernet switch or router.
6 Check the switch mode. In daisychain mode, if you have a loop topology and enable
RSTP, it is possible for RSTP to disable Ethernet port 1 (the uplink port).
Note: It is not recommended to use daisychain mode in a loop topology.
Table 107 Troubleshooting Data Transmission (continued)
STEPS CORRECTIVE ACTION
Table 108 DSL Data Transmission Troubleshooting
STEPS CORRECTIVE ACTION
1 Check the switch mode and port isolation settings.
Check to see that the VPI/VCI and multiplexing mode (LLC/VC) settings in the
subscriber’s ADSL modem or router match those of the ADSL port.
If the subscriber is having problems with a video or other high-bandwidth services, make
sure the IES-1248’s ADSL port’s data rates are set high enough.
2 Check the VLAN configuration.
3 Ping the IES-1248 from the computer behind the ADSL modem or router.
4 If you cannot ping, connect a DSL modem to an ADSL port (that is known to work).
If the ADSL modem or router works with a different ADSL port, there may be a problem
with the original port. Contact the distributor.
5 If using a different port does not work, try a different ADSL modem or router with the
original port.
Table 109 ADSL Voice Troubleshooting
STEP CORRECTIVE ACTION
1 Make sure the subscriber has a POTS splitter properly installed.
2 Check the ADSL line pin assignments shown in Appendix C on page 449.
3 Check the telephone wire connections between the subscriber and the MDF(s).
4 Check the telephone wire and connections between the MDF(s) and USER port(s).