Specifications

2-22 Cisco MGX 8220 Reference, Release 4.1
BNM-155
SMF-155 Back Card
The SMF-155 backcard provides a physical single-mode fiber optic SONET OC-3 interface
conforming to ANSI T1.105 and GR-253-CORE standards. This interface uses SC connectors.
When used in a redundant configuration, redundant cabling is provided through Y-cables.
The back card also provides:
• One DB-15 female connector for T1/E1 clock input
• One BNC connector for E1 clock input
• One DB-15 female connector for alarm interface
BNM-155 LED Indicators
The BNM-155 LED indicators are described in Table2-3. All LEDs are located on the faceplate of
the front card.
Table2-3 BNM-155 LED Indicators
Type of LED Color Meaning
ACTIVE (ACT) LED Green On indicates the card set is in active mode.
STANDBY (STBY) LED Yellow On indicates the card set is in standby mode.
FAIL (FAIL) LED Red On indicates the BNM-155 card set has failed or the line module is
missing.
OC-3 INTERFACE LED Green Green indicates the port is active.
Yellow Yellow indicates a remote alarm on the port.
Red Red indicates a local alarm on the port.
Off indicates the port has not been activated (brought up).
MAJOR (MAJ) ALARM LED Red On indicates a major alarm in the node.
MINOR (MIN) ALARM LED Red On indicates a minor alarm in the node.
DC OK A (DC-A) LED Green On indicates “A” power is OK.
Off indicates “A” power module is missing or present but at
0 volts.
DC OK B (DC-B) LED Green On indicates “B” power is OK.
Off indicates “B” power module is missing or present but at
0 volts.
ACO (ACO) LED Yellow On indicates the ACO (audible cut-off) button has been depressed
during a major or minor alarm. This LED is extinguished when the
alarm is cleared.
HISTORY (HIST) LED Green ON indicates a major or minor alarm has occurred since the last
time the HIST button was pressed.