Product specifications

VDSL. CTC Union
16
Appendix D: Link Watch Dog (LWD)
Q: I had a VDSL link. But, after disconnecting the line for about
eleven minute, there is no link any more. Is this normal?
Yes, this is normal behavior for the modem. A Link Watchdog (LWD) is
activated in the CPE whenever there is no link after a specified time
(Eleven Seconds)
Q:
Why do I need an LWD?
The LWD enables the VDSL Switch to reconnect to the CPE with known
and predefined VDSL link values. This is necessary whenever loading of
the normal VDSL link parameters fails, for example, because of a corrupted
EEPROM. In such cases, the link remains down until both sides have the
same VDSL link parameter values.
In the VDSL Modem, LWD parameters are set automatically, after eleven
minutes, whenever a VDSL link failure occurs. In the VDSL Switch, only
management sets LWD parameters.
CPE Side Start Link Watch Dog
If CPE side (VDSL Modem) power on standby exceed 11 minute without
connecting VDSL Switch, which will start up Link watch dog, you will find
Link fail, users must re-plug power on once to clear that and reconnecting
VDSL Switch.