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Testing the complete configuration
150 Installing and Connecting the MDF and Telephones
SPAN LEDs
The four SPAN LEDs indicate the status of the four T1/E1 facilities. A SPAN LED is in one of the
following states:
● Solid on yellow: Facility is operational and alarm free.
● 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).
● Solid on red: Facility is alarmed.
● Solid off: Facility is not administered or has been busied out.
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 configurations (duplicated
PNC).
Table 23: DS1 Converter yellow LED flashing states (continued)
LED on LED off Condition
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