How do I identify different fibers from their appearances

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Optical fibers are classified into multimode and single-mode optical fibers:
- Multimode optical fibers can be used with multimode optical modules to implement low-cost, short-distance transmission. Multimode optical fibers are classified into OM1, OM2, OM3, and OM4 types. OM1 and OM2 optical fibers are usually orange, whereas OM3 and OM4 optical fibers are usually light green. For specifications of various optical fibers, see the text printed on optical fibers.
- Single-mode optical fibers, usually G.652 fibers, can be used with single-mode optical modules to implement long-distance transmission. Single-mode optical fibers are yellow.

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Check the Stack ID of a switch through indicators
For the S2700, S3700, S5700SI, S5710-X-LI, S5720SI, S5720S-SI, S5700EI, S5700HI, S6720EI, and S6700EI, after the more switching button on the front panel of a switch is pressed and turns red, the port indicators on the front panel indicate the stack ID of the switch. For other models, after the mode switching button on the front panel of a switch is pressed, the port indicators on the front panel indicate the stack ID of the switch. For non-master switches: Switch with the stack ID ranging from 1 to 8: The sequence number of the port indicator that is steady on indicates the stack ID of the switch. For example, if the first port indicator is steady on, the stack ID is 1. If the second port indicator is steady on, the stack ID is 2. Switch with stack ID 0: The number of port indicators that are steady on indicates the number of member devices supported by the product. For example, if the first nine port indicators are steady on, the product supports nine member switches in a stack, and the stack ID of the local switch is 0. For the master switch: The stack ID indicator is blinking. The method to check the stack ID on the master switch is the same as that used on non-master switches.

How do I identify the WLAN indicator
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How do I identify the 3G data card indicator
For a WCDMA data card: -If the indicator blinks green twice at short intervals, the data card has not registered with the network. -If the indicator blinks blue once every 2s (0.5 Hz), the data card has registered with the network. -If the indicator is steady blue, dialup succeeds but the data card is not transmitting data services. -If the indicator is steady light blue, dialup succeeds and the data card is transmitting data services. For a CDMA2000 data card: -If the indicator blinks blue once every 2s (0.5 Hz), the data card has not registered with the network. -If the indicator blinks blue twice at short intervals, the data card has registered with the network. -If the indicator blinks blue once every 0.25s (4 Hz), dialup succeeds and the data card is transmitting data services.

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