DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
LED Interpretation
7-9DS1 CONV (TN574/TN1654) Circuit Pack LEDs
7
DS1 CONV (TN574/TN1654) Circuit Pack LEDs
The TN574 and the TN1654 LEDs provide an indication of the state of the DS1
Converter and facilities, and are covered in the following sec tions of this
document.

TN574 Circuit Pack LEDs

Seven LEDs provide an indication of the state of the DS1 Converter (DS1 CONV)
TN574 circuit pack and the DS1 facilities. The top group has the stand ard red,
green and yellow LEDs. The red and green LEDs have the trad itional meaning,
where red indicates an alarm condition, and g reen indicates testing in progress.
The four green LEDs on the bottom indicate the stat us of the DS1 facilities (see
following section).
Table 7-3. Switch Node Interface Yellow Led Flashing States
LED on LED off Condition
0.1 sec 0.1 sec Fiber Out-of-Frame. This state indicates a failure of test
#238, which may be caus ed by absenc e of the opposite
end EI or Switch Node Interface, a b roken or missing
fiber, or a missing lig htwave transceiver on either
endpoint.
0.5 sec 0.5 sec In Frame — No Neighbor. This state corresp onds to a
failure of test # 237, usually due to a failure of this SNI,
or the EI or SNI at the opposite of the fiber. This
condition may also be due to a faulty Switch Node
Clock.
solid on SNI Active. This is the normal state for an active SNI.
solid off SNI Standby. This is the normal state for a standb y SNI
in systems with a duplicati on option.