User`s manual

NVF-800S 4-Band VDSL IP DSLAM USER’S MANUAL Ver_B.2
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4. Symptom:
VDSL link cannot be established.
Cause:
VDSL speed mode setting failure or phone cable length is over the specification limit of the
speed mode.
Solution:
 Please make sure that the phone wire must be connected between NVF-800S and VDSL CPE
Modem when both are power on. NVF-800S will do link speed function depending on speed
mode setting and phone wire length, therefore if NVF-800S can’t detect VDSL CPE Modem over
phone wire while both power on, this will cause the link to fail.
 Please check phone cable must be 24 gauge with twisted pair and without rust, and the length is
not over 1.9km.
Note:
Phone cable must meet CAT 3 standard or above and without clustering, otherwise will
cause more cross talk issue to reduce DSL power driver.
5. Symptom:
We tested with a regular S0 bus from an NTBA - data works, but ISDN telephone does not.
Solution:
You must connect according to the following chart if you want to connect CO and CPE with
NTBA.