DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
LED Interpretation
7-10DS1 CONV (TN574/TN1654) Circuit Pack LEDs
7
The yellow LED is used to indicate the state of the Fiber Inte rface, the Fiber
Channel, and the DS1 channel in the following m anner and order of priority.
DS1 Facility LEDs
Below the three standard LEDs on the DS1C circuit pac k are four green LEDs
used to indicate whether a rec eive signal is present for eac h of the four DS1
facilities. Figure 7-3 shows which facility (A, B, C, or D) c orresponds to each LED.
If a green LED is off, there is a Loss of Signal condition on th e DS1 facility
associated with that LED. The presence of a sig nal does not guarantee that the
signal is using the correc t framing format or line cod ing; an Alarm Indic ation
Signal indicating that the op posite end of the DS1C comp lex is out of service
may be present.
Table 7-4. DS1C Yellow Led Flashing States
LED on LED off Condition
0.1 sec 0.1 sec Fiber Out-of-Frame or Fiber Loss of Signal
0.5 sec 0.5 sec In Frame, fiber channel down. The fiber c hannel
communicating b etween the DS1C and the other fiber
endpoint (EI or SNI) is down.
1 sec 1 sec In Frame, DS1 channel down. The channel between the
two DS1Cs in the DS1C complex is down.
2 sec 0.2 sec No response from SPE. The SPE is not acknowledging
messages from the DS1C or the communications link to
the SPR is down .
solid on DS1C active. This is the normal state for an active
DS1C.
solid off DS1C standby. This is the normal state for a stand by
DS1C in Critical Reliability Systems (duplica ted PNC).