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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Test the System
Page 4-15LED Indicators
4
DS1 Converter Circuit Pack LEDs
Eleven LEDs provide an indication of the state of the TN1654 DS1 Converter
circuit pack and the T1/E1 facilities. The top group has the standard red, green
and yellow LEDs. The red LED indicates an alarm condition and the green LED
indicates testing in progress. The 4 SPAN LEDs indicate the status of the T1/E1
facilities. The four STATUS LEDs are currently unused and remain off.
The yellow LED is used to indicate the state of the fiber interface, the fiber
channel, the control channel, and the communications link to the SPE in the
following manner and order of priority. See Table 4-2
.
SPAN LEDs
The 4 SPAN LEDs indicate the status of the 4 T1/E1 facilities. A SPAN LED is in
one of the following states:
1. Solid on yellow: Facility is operational and alarm free.
2. Blinking yellow for 2 seconds, off 0.1 seconds: Facility is operational and
alarm free AND is carrying the control channel (facility A or B only).
3. Solid on red: Facility is alarmed.
4. Solid off: Facility is not administered or has been busied out.
Table 4-2. DS1 Converter Yellow LED Flashing States
LED on LED off Condition
0.1
second
0.1
second
Fiber out-of-frame or fiber loss of signal
0.5
second
0.5
second
In frame, fiber channel down. The fiber channel communicating
between the DS1 Converter and the other fiber endpoint (EI or
SNI) is down.
1
second
1
second
In frame, control channel down. The control channel between the
2 DS1 Converters in the DS1 Converter complex is down.
2
seconds
0.2
second
No response from SPE. The SPE is not acknowledging
messages from the DS1 Converter or the communications link to
the SPE is down.
solid on DS1 Converter active. This is the normal state for an active DS1
Converter.
solid off DS1 Converter standby. This is the normal state for a standby
DS1 Converter in critical reliability systems (duplicated PNC).