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Most cards and appliques have light-emitting diode (LED) indicators that show, for example, the state of a port on an interface card or the mode (DTE or DCE) of a serial applique. These LEDs also can be used to troubleshoot and isolate a problem with the chassis and its components.
Typically, you will know a problem exists before you examine the LEDs, but should a problem require more investigation, the LEDs can help identify the problem.
The following card LEDs are included in this appendix:
The following applique LEDs are included in this appendix:
The following sections discuss reading and interpreting the LED indicators on interface and controller cards.
Along the front edge of the CSC-1R (and CSC-2R) card are ten status LEDs: nine red and one green. The order of the LEDs is left to right when looking at the front edge of the card. (See Figure B-1.) Although only the CSC-1R is shown, both the CSC-1R and CSC-2R cards have the same LED configuration.
The red LED on the far left end of the bank of LEDs is the Power-On LED (No. 1). The next LED is the green Processor LED (No. 2). The remaining eight LEDs (3 through 10) are all red. At system boot, these eight LEDs will change state to indicate that the CSC-2R card is being initialized. The seven initialization states of LEDs 3 through 10 are shown in Table B-1.
In the first initialization state, all eight status LEDs (3 through 10) are on. During the next four states, LEDs 7 through 10 will be on, while LEDs 6 through 3 consecutively will turn on then off. States 6 and 7 will indicate a successful initialization.
The first seven LED states display consecutively at system boot. If a problem occurs during this initialization, the state that the LEDs were in when the problem occurred will flash on and off.
When the port inserts onto the ring, LEDs 3 through 10 will flash a series of patterns too fast to see. Following this, LEDs 3 through 10 will strobe back and forth to indicate correct operation. The speed of this strobing is in inverse proportion to the volume of data traffic; the heavier the traffic, the slower the strobing and so forth. Either way, the strobing of these LEDs is the key indicator for the proper operation of the CSC-1R and CSC-2R Token Ring cards.
| LEDs1 | ||||||||
|---|---|---|---|---|---|---|---|---|
| State | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1 | O | O | O | O | O | O | O | O |
| 2 | · | · | · | O | O | O | O | O |
| 3 | · | · | O | · | O | O | O | O |
| 4 | · | O | · | · | O | O | O | O |
| 5 | O | · | · | · | O | O | O | O |
| 6 | · | O | O | · | · | O | O | · |
| 7 | O | · | · | · | · | O | · | O |
To the right of the configuration register, on the front edge of the processor card, are three LEDs. On the CSC/3, the left and center LEDs are red (see Figure B-2), while on the CSC/4, they are yellow (see Figure B-3). The third LED (far right) on each card is green. The LED on the left is a software-programmable status light; it lights (momentarily) during initialization, flashes to indicate an error, and remains off under normal operation. The middle LED is the processor halt light; it lights when the processor halts for any reason. This LED can flash at power-up, but should not remain lit; a problem is indicated when it does. The green LED on the right is a software-programmable run light that lights when the system is running properly.
The four interface ports on the CSC-C2CTR card (numbered left to right 0 through 3) each have a corresponding green LED. (See Figure B-4.) These LEDs indicate the status of each port, and each will light when a port is actively connected to its corresponding ring. The LED is off when the port is inactive (or the ring is inactive), administratively down, or not connected to the ring.
The following sections discuss the LED indicators on the CSC-CCTL and CSC-CCTL2 ciscoBus controller cards.
Figure B-5 illustrates the LEDs that light when a card is present in a corresponding ciscoBus slot. (The orientation of Figure B-5 is looking at the front edge of the card installed in the card cage.) The numbers above each LED indicate the ciscoBus slot number. Depending upon the slot in which the ciscoBus card is installed (slot 0 through 3), the corresponding LED will light to indicate a card in that slot. Some ciscoBus cards have appliques that require power from the card to which they attach. If these appliques are not connected correctly, the corresponding LED on the CSC-CCTL will not light. All other LEDs momentarily light at power on, but are not currently used.
The LEDs on the CCTL2 card indicate when an interface is present in a ciscoBus slot. The front edge of the CCTL2 card contains a bank of five LEDs as shown in Figure B-6. (The orientation of
Figure B-6 is looking at the front edge of the card installed in the card cage.) There is one red LED for each interface slot in the ciscoBus, and a green LED to indicate a successful boot procedure. One red LED will light for each correctly connected ciscoBus card using the correct version of microcode. It will not light if the card is incorrectly connected or if the microcode on that ciscoBus card is the wrong version. Figure B-6 shows the LEDs on the CCTL2 card. The numbers above each LED (0 through 3 from right to left) indicate the ciscoBus slot number assigned to that LED.
Upon power-up, all five LEDs light indicating the CCTL2 card is active. After the system is booted and the ciscoBus controller card microcode has completed its discovery phase, only those red LEDs that indicate the presence of a card in a ciscoBus slot will light. The green LED lights to indicate that the boot operation was successful and that the CCTL2 card firmware version is correct.
The LEDs on the environmental monitor card (CSC-ENVM) are located just to the left of the edge connector on the right front edge of the card. (See Figure B-7.) Table B-2 lists the CSC-ENVM LED functions. LEDs are listed as they appear on the front of the card, from left to right.
| LEDs by Color | LED Descriptions |
|---|---|
| First Red LED (far-left LED) | Normally OFF--This Conditional/Reset LED lights to indicate that the Reset Line has been activated; however, this does not indicate the reset reason, just that the reset condition has been activated. |
| Second Red LED | Normally OFF--This New Data LED lights to indicate that the system processor is trying to communicate with the CSC-ENVM card. |
| Third Red LED | Normally OFF--This Interrupt Status LED lights to indicate that an interrupt request has been issued to the system processor and that there may be a problem somewhere within the system. |
| Green LED (far-right LED) | Normally ON--This Power Available LED lights to indicate that the card is operational and that power (+5V) to the card is applied. |
The CSC-MCI and CSC-SCI cards contain a bank of 16 LEDs. (Four are currently used.) Table B-3 lists the LEDs that are used and the serial and Ethernet port each LED represents. LED 0 is at the left end of each block of four LEDs (as you view the front edge of the card in the system card cage--shown in Figure B-8 and Figure B-9). At startup, all LEDs flash and then only those LEDs that indicate active interfaces will stay lit. A problem is indicated if all LEDs remain lit after the system boots, or if the LED of a specific interface does not stay lit after the system boots.
| LED | MCI Port | SCI Port |
|---|---|---|
| 0 | Ethernet 0 | Serial 0 |
| 4 | Serial 0 | Serial 1 |
| 8 | Ethernet 1 | Serial 2 |
| 12 | Serial 1 | Serial 3 |
When the indicated LED is lit, Carrier Detect (CD) is present on that serial interface, and the interface is enabled. In Ethernet systems, this means that the interface is attached to the Multibus correctly, but is not an indication of complete functionality.
The CSC-MC+ has two LEDs on the front edge of the card. (See Figure B-10 and note the chassis front orientation of the illustration.) When viewed with the card installed in the card cage, the green LED is on the left. The green LED is the power indicator and should be lit when power is on. The yellow LED is lit during Flash copy operations, and it will be off at all other times. When the write-protect jumper is removed, Flash memory cannot be overwritten or erased.
The CSC-MEC cards contain two, four, or six LEDs: one to the right of each Ethernet port on the cards (as you view the front edge of the cards in the system card cage). Figure B-11 shows the CSC-MEC6 card LEDs and the corresponding Ethernet port address (E0 through E5) that each LED represents. The CSC-MEC2 and CSC-MEC4 have two or four LEDs, respectively, with functions identical to those on the CSC-MEC6. With Ethernet systems, a lit LED indicates that the interface port is attached to the Multibus correctly, but it does not necessarily mean that the port is functional. The CSC-C2MEC LED functions are identical to the CSC-MEC.
The CSC-R16M Token Ring card has 14 LED indicators located on the front edge of the card. (See Figure B-12.) During normal operation, after the card has initialized and the port is connected to the ring, LEDs F through M will strobe back and forth to indicate proper operation. The descriptions of the CSC-R16M LED functions are listed in Table B-4.
| LED | Function |
|---|---|
| A | Processor halted (normally off) |
| B | -12V fused |
| C | +12V fused |
| D | +5V fused |
| E | +5V (power) |
| F-M | Activity lights1 |
| N | Run light (green) |
Checking applique LEDs requires access to the chassis rear panel, which may require removing the system from a rack or closet. In the following serial applique LED tables, the symbols <-- and --> indicate signal direction with respect to DCE and DTE devices. For example, "DCE <-- DTE" means signal direction is from DTE to DCE.
The following LED indicators are included in this section:
The Ethernet 10BaseT applique has the following green LED indicators. (See Figure B-13.)
At power up, the LINK LED lights up and remains lit if it is connected to a 10BaseT link that is powered up. This LED indicates that a good link has been established. If it does not light, check the opposite end of the link to ensure that it is powered up and that the cable is securely installed. If the LED still does not light, switch the transmit and receive pair at one end of the link and restart the system. When a good link is established, the RCV LED will flash or remain lit to indicate packet traffic on the link. The XMT LED will light when the unit transmits data over the link
If the opposite end of the link is connected to a hub, the hub will perform a crossover function, which means that the transmitter from the unit goes to the receiver of the hub, and the transmitter from the hub goes to the receiver of the unit. This configuration is correct; however, if the unit connects to an external media attachment unit (MAU), then the crossover function must be performed in the attaching wires. Otherwise, the two transmit wires are connected to each other, as are the two receive wires.
A bank of nine LEDs, shown in Figure B-14, is located on each FDDI applique to indicate the current line state of each of the two physical connections to the applique (PHY-A and PHY-B, as described in Table B-5). When the ring is operational (when the line protocol is up), the LEDs will oscillate between ILS, ALS, and MLS. (These line states are defined in Table B-5.) The ILS will predominate, so LED 2 will glow most brightly. LED 0 will be slightly dimmer. And LED 1 will be almost dark. The X3T9.5 FDDI specification explains the meaning of these line states in detail.
| PHY-x LEDs1 | |||
|---|---|---|---|
| 0 | 1 | 2 | State |
| O | O | O | Line State Unknown (LSU) |
| O | O | · | Halt Line State (HLS) |
| O | · | O | Master Line State (MLS) |
| O | · | · | Active Line State (ALS) |
| · | O | O | Noise Line State (NLS) |
| · | O | · | Quiet Line State (QLS) |
| · | · | O | Idle Line State (ILS) |
| · | · | · | Elasticity Buffer Overflow/Underflow (OVUF) |
The high-speed serial applique (APP-LHS) is used with the High-Speed Communications Interface (HSCI) card. The APP-LHS LED indicators are shown in Figure B-15, and their functions and states are listed in Table B-6.
| Signals | At Power On1 | Normal2 | Signal Function | Direction DCE DTE |
|---|---|---|---|---|
| +5V | O | O | VCC | - |
| -5V | O | O | VEE | - |
| RT | O | O | Receive Timing | --> |
| ST | O | O | Send Timing | <-- |
| CA | O | O | DCE Available | <-- |
| TA | O | O | DTE Available | --> |
| LA | · | · | Loopback Circuit A | --> |
| LB | · | · | Loopback Circuit B | --> |
| LC | · | · | Loopback Circuit C | <-- |
| LI | O | · | Loopback Internal3 | - |
| OK | · | O | SW OK4 | - |
| ER | · | · | Ribbon cable Error | - |
The Receive Timing (RT) and Send Timing (ST) LEDs indicate that a clock signal is present inside the APP-LHS transmitter and receiver. The clock source is external during normal operation and internal during loopback.
DCE Available (CA) indicates that the DCE data service unit (DSU) is prepared to send and receive data to and from the DTE. DTE Available (TA) indicates the DTE is prepared to send and receive data to and from the DCE (DSU). Data transmission can begin only after both CA and TA have been asserted.
Loopback circuit A (LA), Loopback Circuit B (LB), and Loopback Circuit C (LC) are software-controlled functions. When lit, LA, LB, LC, and Loopback Internal (LI) indicate that the system is in an internal or external loopback diagnostic mode. These loopbacks enable the system diagnostics to verify the links between the DTE and DCE. LA and LB are sent from the DTE to request loopbacks in the DSU. LC is sent by the DCE (DSU) to request loopbacks from the DTE; by default, LC is inhibited by software.
If the DSU supports LC, you must enable it with the hssi external-loop-request configuration command before it can be used. If LC is not used, it should remain disabled to avoid noise on the LC line. To disable LC, use the no hssi external-loop-request configuration command. Refer to the appropriate optional software publication for more information on using these configuration commands.
The green OK indicator lights after the software has performed its startup verification. The red ribbon cable error (ER) indicator lights when the internal ribbon cable, which is located between the HSCI system card and the APP-LHS applique, is installed incorrectly.
Table B-7 lists the 15 LEDs that indicate the status of the HD V.35 NRZI synchronous serial applique. LEDs are listed as viewed from left to right on the front of the applique. The LEDs on the applique are located beneath the connector as shown in Figure B-16.
| LED Number | Color | Mnemonic DTE (DCE) | Function | Direction DTE DCE |
|---|---|---|---|---|
| 1 | Red | RxD (TxD) | Receive Data (Transmit Data) | <-- --> |
| 2 | Red | SCR (SCTE) | Serial Clock Receive (Serial Clock Transmit External) | <-- --> |
| 3 | Red | TxD (RxD) | - | --> <-- |
| 4 | Red | SCTE (SCR) | - | --> <-- |
| 5 | Red | DTR | Data Terminal Ready | -- --> |
| 6 | Red | RTS | Clear To Send | -- --> |
| 7 | Red | RTS | Request To Send | -- <-- |
| 8 | Red | DCD | Data Carrier Detect | -- <-- |
| 9 | Red | LT | Software Loopback | On if configured "looped" |
| 10 | Green | +5V | +5V present | On if OK |
| 11 | Green | +12V | +12V present | On if OK |
| 12 | Green | -12V | -12V present | On if OK |
| 13 | Green | OK | Applique test OK | On if OK |
| 14 | Green | NRZI/NRZ | NRZI selection | On for NRZI |
| 15 | Red | DCE | Mode selection | On for DCE |
Table B-8 lists the 14 LEDs that indicate the status of the HD V.35 synchronous serial applique. LEDs are listed as viewed from left to right on the front of the applique. (See Figure B-17). Use the green LEDs toward the end of the row for orientation. The LEDs on the HD V.35 applique are located beneath the connector.
| LED Number | Color | Mnemonic DTE (DCE) | Function | Direction DCE DTE |
|---|---|---|---|---|
| 1 | Red | TxD (RxD) | Transmit Data (Receive Clock) | <-- (-- >) |
| 2 | Red | SCTE (SCR) | Serial Clock Transmit External (Serial Clock Receive) | <-- (-->) |
| 3 | Red | RxD (TxD) | - | --> (<--) |
| 4 | Red | SCR (SCTE) | - | --> (<--) |
| 5 | Red | DTR | Data Terminal Ready | --> |
| 6 | Red | CTS | Clear To Send | --> |
| 7 | Red | RTS | Request To Send | <-- |
| 8 | Red | DCD | Data Carrier Detect | <-- |
| 9 | Red | LT | Software Loopback | <-- |
| 10 | Green | +5V | +5V present | On if OK |
| 11 | Green | +12V | +12V present | On if OK |
| 12 | Green | -12V | -12V present | On if OK |
| 13 | Green | OK | Applique test OK | On if OK |
| 14 | Red | DCE | Mode selection | On for DCE |
On the RS-232, RS-232 Synchronous Data Link Control (SDLC), and RS-449 appliques, the LEDs are located beneath the connectors. These synchronous serial appliques have the lamp pattern shown in Table B-9, except the RS-232 SDLC applique which has two additional LEDs. Use the green LEDs toward the end of the row for orientation. LEDs in Table B-9 are listed as viewed left to right on the applique.
Number | Color | RS-232 SDLC DTE (DCE) | RS-232 DTE | RS-232 DCE | RS-449 DTE | RS-449 DCE |
|---|---|---|---|---|---|---|
| 1 | Red | TxD (RxD) | RxD | RxD | RxD | RxD |
| 2 | Red | RxC | RxC | RxC | RxC | SCT/SCR |
| 3 | Red | RxD | TxD | RxD | TxD | RxD |
| 4 | Red | TxC | TxC | TxC | TxC | RxC |
| 5 | Red | DCD | DTR | DCD | DTR | DCD |
| 6 | Red | CTS | RTS | CTS | RTS | CTS |
| 7 | Red | RTS (CTS) | CTS | CTS | CTS | CTS |
| 8 | Red | DTR (DCD) | DCD | DCD | DCD | RLSD |
| 9 | Red | LT | LT | LT | LTST | LT |
| 10 | Green | +5V OK | +5V OK | +5V OK | +5V OK | +5V OK |
| 11 | Green | +12V OK | +12V OK | +12V OK | +12V OK | +12V OK |
| 12 | Green | -12V OK | -12V OK | -12V OK | -12V OK | -12V OK |
| 13 | Green | Applique OK | Applique OK | Applique OK | Applique OK | Applique OK |
| 14 | Red | NRZI/NRZ (on for NRZI) | - | - | - | - |
| 151 | Red | DCE/DTE (on for DTE) | - | - | - | - |
| Mnemonic | Function | Direction |
|---|---|---|
| CTS | Clear To Send | DCE to DTE |
| DCD | Data Carrier Detect | DCE to DTE |
| DTR | Data Terminal Ready | DTE to DCE |
| LT (LTST) | Loopback Test | DTE to DCE |
| RTS | Request To Send | DTE to DCE |
| RxC | Receive Clock | DCE to DTE |
| RxD | Receive Data | DCE to DTE |
| SCT/SCR | Source Clock Transmit/Source Clock Receive | DCE to DTE |
| TxC | Transmit Clock | DCE to DTE |
| TxD | Transmit Data | DTE to DCE |
On the X.21 serial applique, the 14 LEDs, which are positioned as shown in Figure B-18, indicate the status of the interface. Use the green LEDs toward the end of the row for orientation. The LEDs are located beneath the connector. The LEDs are listed in Table B-11 as viewed from left to right when facing the front of the applique.
| LED Number | Color | Mnemonic DTE | Mnemonic DCE | Function | Direction DCE DTE |
|---|---|---|---|---|---|
| 1 | Red | RxD | TxD | Receive Data | --> |
| 2 | Red | RxC | - | Receive Clock | --> |
| 3 | Red | TxD | RxD | Transmit Data | <-- |
| 4 | Red | DCE CLK | DCE CLK | Internal Clock | --> |
| 5 | Red | BDSR | BDSR | Data Set Ready B | --> |
| 6 | Red | RTS/CONTROL | CTS/INDICATE | Request To Send | <-- |
| 7 | Red | CTS/INDICATE | RTS/CONTROL | Clear To Send | --> |
| 8 | Red | BDCD/BCTS | BDCD/BCTS | Data Carrier Detect /Clear To Send | --> |
| 9 | Red | - | LOOP1 | Loopback | <-- |
| 10 | Green | +5V | +5V | +5V present | On if OK |
| 11 | Green | +12V | +12V | +12V present | On if OK |
| 12 | Green | -12V | -12V | -12V present | On if OK |
| 13 | Green | OK | OK | Applique test OK | On if OK |
| 14 | Red | DCE | DCE | DCE Mode | On for DCE |
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