Specifications

Chapter 3 Testing & Diagnostics
3-10
Framing LED is Yellow Yellow Alarm Received from Network. This may indicate
a carrier Out of Frame condition or if the Access Bank is
on a point-to-point span, this may indicate a far end
equipment failure.
1. Check the Access Bank connection to the T1 line at the
unit and at the demarcation. The outbound T1 signal may
not be connected.
2. Check the Access Bank framing switch (#4) on the T1
control switch) to be sure it is set the same as the far end or
the network.
Framing LED is Off Framing Bit Error Rate Exceeds 10-5 (ESF or D4 framing
modes).
1. Check the T1 connection between the T1 cable and the
Access Bank and the T1 cable and the demarcation.
2. Run the Self Test. If the Test light comes-up Green,
contact your carrier to have the T1 line tested.
Channel LED is always Green and never turns Off For Ground Start operation, the Channel LED is off in the
idle state. A Green Channel LED means that the channel
has been seized by an incoming call and the Tip is
grounded. It will change to Yellow when the call is
answered. An out going call will cause the LED to turn
Red during call dialing and set-up. It will then change to
Yellow when the call is answered and in progress. The
Channel LED will return to Red or Green when either the
far-end or near end (respectively) goes on hook. If the
channel LED is always green when there is no incoming
call, the carrier has that channel configured for Loop Start
and the Tip is always grounded. Green is the normal idle
status for Loop Start signaling.
Channel LED is RED during Self Test 1. Check the individual channel Test/Busy Switch. RED
is an indication that this switch may be activated.
2. If the Test/Busy switch is off, and the channel LED is
still RED, check the Self Test LED. If the Self Test LED is
Green, rerun the Self Test.
Ringback tone not heard on a channel at
punchdown block during self-test .
1. Check the 25 pair cable for a loose connection.
2. Check 25 pair cable for broken/open pair.
3. Turn off self test and listen to the test tone. (T1 Option
switch #7.) If no test tone is heard, call your
distributor/dealer.
Access Bank shuts off for no apparent reason. Check to see that the unit is not in an environment that is
over 104 F (40 C). Thermal protectors inside the Access
Bank shut the unit down for protection of the electronic
circuitry if it gets too hot. Cool off the room. The Access
Bank will restart automatically once it reaches a
comfortable temperature.