. hp :: 3000 :: lan3000 :: 30242-90003 LAN3000 V Diagnostic and Troubleshooting Guide Aug1987 . ries 37 and MICRO3000 Systems Each of the 15 LEDs is labeled with different labels. The single alphabetic labelsprovide a quick reference to the LEDs. In addition, one- and two-lettermnemonics are provided to remind users of the LED function. The labels andfunctions of the LEDs are shown in Figure 3-3. Activity LEDs3-2 The LEDs can be classified into the following groups: • Cable Interface Activity LEDs. The seven LEDs on the left, labeled Athrough G, monitor activity on the cable, hence the network
. hp :: 3000 :: lan3000 :: 30242-90003 LAN3000 V Diagnostic and Troubleshooting Guide Aug1987 . ries 37 and MICRO3000 Systems Each of the 15 LEDs is labeled with different labels. The single alphabetic labelsprovide a quick reference to the LEDs. In addition, one- and two-lettermnemonics are provided to remind users of the LED function. The labels andfunctions of the LEDs are shown in Figure 3-3. Activity LEDs3-2 The LEDs can be classified into the following groups: • Cable Interface Activity LEDs. The seven LEDs on the left, labeled Athrough G, monitor activity on the cable, hence the network. • MPU Activity LEDs. During normal operation, the eight LEDs on theright (H through N plus *) monitor LANIC card MPU , these LEDs are also used by card self test (refer to Chapter 5).When used by self test, LED mnemonics do not apply. ABCOEFG HIJKLMN* TX RX MN OL RO Q IT ST MAU POWER(NOT USED ONSTARLAN CARD) COLLISION . EDGE DATA OUT <C. LEVEL CARRIER SENSE N0 A c T1 V1 TY L1 GHT A C T 1 V 1 T Y H £AVY ACT 1 v 1 TY STUCK 0N EDGE OFF BLINK ON OFF LEVEL OFF OFF ON ON. SELF TEST IDLE SELF TEST QUIESCENT ROM CODE DOWN LOADING MONITOR MODE PROCESSING A RECEIVEPROCESSING A TRANSMIT SELF TEST BIT | Figure 3-3. LED Labels and Functions Table 3-1 provides a descriptive summary of the LEDs during normal operation. Activity LEDs3-3 LED Table 3-1. LED Description During Normal Operation Mnemonic VP CL-E CL-L DO-E DO-L CR-E CR-L TX RX DL RO IT ST Description For Coaxial Cable LAN: ON when power is available to the StarLAN: Not used, always OFF. ON when the collision line goes active. ON for steady collision detect signal from the Manchesterencoder/decoder. ON when the Data Out signal from the Manchester encoder/decoder goes from false to true. ON if there is a steady Data Out signal from the Manchesterencoder/decoder. ON when the carrier sense signal from the Manchester encoder/decoder goes from false to true. ON if there is a steady carrier sense s
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