cc/td/doc/product/atm/l2020/2020r231
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LEDs

LEDs

There are a number of LEDs on the bulkheads of many cards in a LightStream 2020 multiservice ATM switch (LS2020 switch). The information provided by the LED is also provided by the StreamView monitor application on the NMS. LEDs serve the following purposes:

The switch card, NP, and line card LEDs are visible from the front of the LS2020 chassis. The LEDs on the access cards are visible from the rear of the chassis.


Note The SAC and the LSAC do not have LEDs.

Fault LEDs

If the fault (FLT) LED on a line card, NP card, or switch card is on:

If the POST failed, refer to the chapter "Hardware Troubleshooting" for instructions on running diagnostics on the card. (You may want to bring up the rest of the system first.)
If the temperature exceeds the warning or shutdown temperature, check the blowers (see the section "General Troubleshooting" in the "Hardware Troubleshooting" chapter) and make sure the air flow into, through, and away from chassis is unrestricted. Note that leaving a chassis open can cause temperature problems. To ensure proper air flow, make sure all components, cards, and bulkhead filler panels are firmly screwed in place.
If any voltage is out of the normal range, call your customer service representative for instructions on managing the voltage.
If the Application field says Disabled, use the CLI command set card <slot#> active to enable the card.
If the bulk power supply has failed, refer to "General Troubleshooting" in the chapter entitled "Hardware Troubleshooting," and "Replacing a Power Tray" in the chapter entitled "Replacing FRUs."

LED Descriptions

This section (consisting of Table A-1 through Table A-11) describes the LEDs on all LS2020 cards.


Table  A-1: LEDs on the Switch Card
Name Color Description
FLT (fault) Yellow Turned on by power-on reset, turned off when POST passes. Shines steadily to signal a problem. See the section "LEDs" for more information.
RDY
(ready)
Green Controlled by the TCS hub. Blinks while POST runs. When tests complete and are passed, light stays on continuously. LED is turned off by power-on reset. The READY light indicates that TCS is ready to use either hub as the primary hub, or to take over from the primary in case of failure. This LED remains lit if one port is having a problem, as long as the overall functionality of the board is intact.
FLT/RDY Both LEDs illuminate when flash is loading.
TCS Green Illuminates when TCS hub has power.
VCC (power) Green Illuminates when the board has power.
TCS SEL Green Indicates that the TCS hub on this card is primary. (Note that the primary hub and the active switch fabric may not be on the same switchcard.) Console output is directed to the console port of the switch card on which this LED is lit.
BITS OK Green Illuminates to indicate the BITS clock is providing a valid clock signal.

Table  A-2: LEDs on the NP
Name Color Description
FLT (fault) Yellow Turned on by power-on reset, turned off when POST passes. Shines steadily to signal a problem. See the section "LEDs" for more information.
RDY (ready) Green Controlled by the TCS slave. Blinks while POST runs. When tests complete and are passed, the light stays on continuously. Turned off by power-on reset.
FLT/RDY Both LEDs illuminate when flash is loading.
VCC (power) Green Illuminates when main 5V supply on the card is turned on.
TCS Green Illuminates when the 5V TCS power supply on the card is active. Is lit whenever the bulk power supply is turned on.
A Green Illuminates when the active TCS hub is on the switch card in slot A.
B Green Illuminates when the active TCS hub is on the switch card in slot B.
TX Green Illuminates when the TSU is sending a non-null cell.
RX Green Illuminates when the FSU is receiving a non-null cell.

Table  A-3: LEDs on the Low-Speed Line Card
Name Color Description
FLT (fault) Yellow Turned on by power-on reset, turned off when POST passes. Shines steadily to signal a problem. See the section "LEDs" for more information.
RDY (ready) Green Blinks while POST runs and illuminates continuously when POST completes and passes. Turned off by power-on reset.
FLT/RDY Both LEDs illuminate when flash is loading.
FLT/RDY Both LEDs illuminate when flash is loading.
VCC (power) Green Illuminates when the card's main 5V supply is within normal levels.
TCS Green Illuminates when the 5V TCS supply is within normal levels.
A Green Illuminates when the active TCS hub is on the switch card in slot A.
B Green Illuminates when the active TCS hub is on the switch card in slot B.
TX Green Illuminates when the TSU is sending a non-null cell.
RX Green Illuminates when the FSU is receiving a non-null cell.
0 - 7 Green Illuminates when the port indicated is active.

Table  A-4: LEDs on the Medium-Speed Line Card
Name Color Description
FLT (fault) Yellow Turned on by power-on reset, turned off when POST passes. Shines steadily to signal a problem. See the section "LEDs" for more information.
RDY (ready) Green Blinks while POST runs and illuminates continuously when POST completes and passes. Turned off by power-on reset.
FLT/RDY Both LEDs illuminate when flash is loading.
FLT/RDY Both LEDs illuminate when flash is loading.
VCC (power) Green Illuminates when the card's main 5V supply is within normal levels.
TCS Green Illuminates when the 5V TCS supply is within normal levels.
A Green Illuminates when the active TCS hub is on the switch card in slot A.
B Green Illuminates when the active TCS hub is on the switch card in slot B.
TX Green Illuminates when the TSU is sending a non-null cell.
RX Green Illuminates when the FSU is receiving a non-null cell.
0, 1 Green Illuminates when the port indicated is active.

Table  A-5: LEDs on the Packet Line Card
Name Color Description
FLT (fault) Yellow Turned on by power-on reset, turned off when POST passes. Shines steadily to signal a problem. See the section "LEDs" for more information.
RDY (ready) Green Blinks while POST runs and illuminates continuously when POST completes and passes. Turned off by power-on reset.
FLT/RDY Both LEDs illuminate when flash is loading.
VCC (power) Green Illuminates when the card's main 5V supply is within normal levels.
TCS Green Illuminates when the 5V TCS supply is within normal levels.
A Green Illuminates when the active TCS hub is on the switch card in slot A.
B Green Illuminates when the active TCS hub is on the switch card in slot B.
TX Green Illuminates when the TSU is sending a non-null cell.
RX Green Illuminates when the FSU is receiving a non-null cell.
LN FLT
(line fault)
Yellow Illuminates when at least one port either has no cable connected to it or is configured to be active (port status/ifAdminStatus = up) and has errors. When LN FLT is lit, try the following:

  • Attach cables to all ports that are in use.

  • Use the CLI command show port <card#>.<port#> status to determine whether there are errors on the line.

LNS OK
(lines OK)

Green Illuminates when at least one port that is configured to be up is functioning properly. This LED turns off if all ports' administrative and operational statuses are down, or if all active ports have errors or missing cables.

Table  A-6: LEDs on the Cell Line Card
Name Color Description
FLT (fault) Yellow Turned on by power-on reset, turned off when POST passes. Shines steadily to signal a problem. See the section "LEDs" for more information.
RDY (ready) Green Blinks while POST runs and illuminates continuously when POST completes and passes. Turned off by power-on reset.
FLT/RDY Both LEDs illuminate when flash is loading.
VCC (power) Green Illuminates when the card's main 5V supply is within normal levels.
TCS Green Illuminates when the 5V TCS supply is within normal levels.
A Green Illuminates when the active TCS hub is on the switch card in slot A.
B Green Illuminates when the active TCS hub is on the switch card in slot B.
TX Green Illuminates when the TSU is sending a non-null cell.
RX Green Illuminates when the FSU is receiving a non-null cell.
LN FLT
(line fault)
Yellow Illuminates when at least one port either has no cable connected to it or is configured to be active (port status/ifAdminStatus = up) and has errors. When LN FLT is lit, try the following:

  • Attach cables to all ports that are in use.

  • Use the CLI command show port <card#>.<port#> status to determine whether there are errors on the line.

LNS OK
(lines OK)

Green Illuminates when at least one port that is configured to be up is functioning properly. This LED turns off if all ports' administrative and operational statuses are down, or if all active ports have errors or missing cables.

Table  A-7: LEDs on the T3 and E3 Access Cards (MSAC, T3AC and E3AC)
Name

MSAC
T3AC and E3AC
Color

Description
RXC
(receive clock)
R Green Illuminates when a DS3 transmitter is present at the other end of the connection. Goes out to indicate that clock is not being received.
OOF
(out of frame)
O Yellow Illuminates when the DS3 transmitter at the other end of the connection is not sending framing pulses.
FERF
(far end receive failure)
F Yellow Illuminates when the DS3 transmitter at the other end of the connection is not receiving framing pulses from this port.
AIS
(alarm indication signal)
A Yellow Illuminates when this port receives an indication that an error has occurred in an upstream device.

Table  A-8: LEDs on the Ethernet Access Cards (EAC and FEAC)
Name Color Description
0 - 7
(port LEDs)
Green Illuminates when the port indicated is receiving or transmitting packets.
FLT1 (fault) Yellow This LED echoes the state of the LN FLT (line fault) LED on the PLC in the same slot. (PLC LEDs are described in Table A-5 .)
VCC1 (power) Green Illuminates when the card's main 5V supply is within normal levels.

1These LEDs are not present on the FEAC.


Table  A-9: LEDs on the FDDI Access Card
Name Color Description
FLT (fault) Yellow This LED echoes the state of the LN FLT (line fault) LED on the PLC in the same slot. (PLC LEDs are described in Table A-5 .)
VCC (power) Green Illuminates when the card's main 5V supply is within normal levels.
0A, 0B, 1A, 1B
(port LEDs)
Green Illuminates when the port indicated is ready to transmit or receive data.

Table  A-10: LEDs on the T1/E1 CEMAC
Name Color Description
LOS
(loss of signal)
Yellow Illuminates if this port is not receiving an input signal.
AIS
(alarm indication signal)
Yellow Illuminates when this port receives an indication that an error has occurred in an upstream device.

Table  A-11: LEDs on the OC-3C Access Cards (SM and MM)
Name Color Description
SD
(signal detect)
Green Illuminates when an incoming signal is detected on the port indicated. If this LED goes out, it may indicate either a loose cable or a fault in the remote device.
OOF
(out of frame)
Yellow Illuminates when the device at the other end of the connection is not sending framing pulses.
FERF
(far end receive failure)
Yellow Illuminates when the device at the other end of the connection is not receiving framing pulses from this port.
AIS
(alarm indication signal)
Yellow Illuminates when this port receives an indication that an error has occurred in an upstream device.
Safe
(Single mode cards only)
Green Illuminates when the transmit laser on the port is shut off, so there is no danger in looking at the connectors.

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