Telos Zephyr Xstream User Manual page 288

Normal status is indicated by the LED being lit. Rapid flashing indicates loss of the ISDN line at
the lowest (physical, OSI Layer 1) level, or use of the incorrect jack on the ISDN interface card
(use the lower, RJ‐11 style jack if you are using the built‐in NT1; i.e. are connecting directly to
the raw copper 2B1Q circuit). Slow flashing of this LED may indicate problems with the Zephyr
Xstream.
ON
This means that the NT1 is fully operational, and OSI layer 1 is fully initialized with the BRI circuit
and the rest of the Zephyr/Zephyr Xstream *
FLICKERING
A fast flash rate means the NT1 has not initialized to the U interface (i.e. the ISDN BRI circuit). It
is normal for this to occur for about 30 seconds or less after the unit is rebooted, the ISDN
circuit connected, or the ISDN reinitialized. If this state persists, the problem is most likely the
ISDN circuit (about 80%) although it could be the Xstream's terminal adaptor card (about 20%).
*
i
ISDN TIP!
IF YOU ARE USING THE "RJ-45" ISDN "S INTERFACE" (4-wire) NOTE:
The ISDN S interface is generally used outside of the USA & Canada. If you are not using the
ISDN U (2-wire) interface you can disregard this LED. In that case, this LED will be
flickering.
FLASHING
A slow flash means the NT1 has completed initializing the U interface (the line side) and is
initializing the S interface to the rest of the Zephyr Xstream. If this state persists for more than
40 seconds, it is most likely a hardware problem with the Zephyr Xstream. You should "reseat"
the ISDN card. Check for foreign voltage on the ISDN (you should see about 48 volts DC
[possibly pulsing] on the line) If the problem persists, contact Telos Customer Support.
OFF
This is an illegal state and should not occur. In rare cases this could be the ISDN circuit. If
disconnecting the ISDN line causes the LED to begin flickering, suspect this. Otherwise, if the
Zephyr Xstream seems to be booting up, it indicates a bad Terminal Adaptor Card (90%). You
should "reseat" the ISDN card. If the problem persists, contact Telos Customer Support. **
ALTERNATING
If the state alternates between more than one state, and continues to cycle between those
states, something is wrong. First, check to see if you have the ISDN plugged into the right jack.
The ISDN (U interface) must be plugged into the "U" jack, which is the lower jack. This is an RJ11
Section 13: Deep Tech Information and Troubleshooting
USER'S MANUAL
276