BT NTU6, Operating Manual, Page: 9 / 16

5 If you have a problem
If you think there’s a problem with your KiloStream private circuit or with
your NTU, please try the checks below: you may be able to solve the
problem.
If a fault proves to be in your terminal equipment or on-site wiring, rather
than in the private circuit, BT reserves the right to charge for time spent on
a visit to your premises: it’s in your interest to carry out these checks first.
Operating guide
9
if you see the cause is you should
no lights illuminated no power to the NTU switch the power on and check
and a blank LCD all connections
and a fault on the circuit check all connections to the NTU
FAULT light illuminated and then report the fault to the
relevant Service Centre
and the TX NRDY button or local ask the distant end user to check
FAULT and RXD lights loop has been operated at
illuminated the distant NTU
and the distant data terminal ask the distant end user to check
RX NRDY light illuminated equipment (DTE) is not
connected
a remote loop has been ask the distant end user to check
and TM light illuminated activated at the distant end
and the TX NRDY button has deselect the TX NRDY button
TX NRDY and RXD lights been operated on the local
illuminated NTU
and the local DTE is not raising check with your DTE supplier
RXD light illuminated a ‘request to send’ signal
S: RECEIVE DATA
S: RECEIVE DATA
S: LOOP ACTIVE
S: NTU NOT READY
S: NTU NOT READY
S: NTU NOT READY