Q: Is 10/100Mbps auto-negotiation the same as Plug-n-Play?
No. The RJ-45 ports on the series 2700 Switches are configured as "Auto". That is, when connecting to attached devices, the switch will operate in one of two ways to determine the link speed and the communication mode (half duplex or full duplex):
- if the connected device is also configured to Auto, the switch will automatically negotiate both link speed and communication mode
- if the connected device has a fixed configuration, for example 100 Mbps, at half or full duplex, the switch will automatically sense the link speed, but will default to a communication of half duplex
Because the series 2700 Switches behave in this way in compliance with the IEEE 802.3u standard, if a device connected to an RJ-45 port on the switch has a fixed configuration at full duplex, the device will not connect correctly to the switch. The result will be high error rates and very inefficient communications between the switch and the device.
Make sure that all devices connected to the RJ-45 ports on the series 2700 Switches are configured to auto negotiate, or are configured to connect at half duplex (all hubs are configured this way, for example).
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Q: How does the HP Auto-MDIX feature work? What HP ProCurve series 2700 Switches support this feature?
HP Auto-MDIX is a feature on all 10/100/1000Base-T ports of the HP ProCurve series 2700 Switches. The switch automatically detects the signaling on the cable from the connected device and operates as either an MDI or MDIX port. As a result, a "straight-through" twisted-pair cable can be used; you no longer have to use "crossover" cables, although "crossover" cables can also be used for any of the connections. The following HP ProCurve series 2700 Switches support the HP Auto-MDIX feature:
- HP ProCurve Switch 2708 (J4898A)
- HP ProCurve Switch 2724 (J4897A)
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Q: What type of cables and lengths can I use with HP ProCurve series 2700 Switches?
The following types and lengths of cables can be used:
- For ports operating at 10 Mbps, the maximum length is 100 meters using category 3, 4, or 5, 100 ohm differential unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable.
- For ports operating at 100 Mbps, the maximum length is 100 meters using category 5, 100 ohm differential UTP or STP cable.
- For ports operating at 1000 Mbps, the maximum length is 100 meters using category 5E or better, 100 ohm differential UTP or STP cable.
Note: Since the 10Base-T operation is through 10/100/1000Base-T ports, if you ever want to upgrade the ports to 100Base-TX, it would be best to cable the ports initially with category 5 cable. For 1000Base-T, category 5E, or better, cable should be used.
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Q: Do the HP ProCurve series 2700 Switches support IEEE 802.3, 802.3u and 802.3ab?
The following HP ProCurve series 2700 Switches support the IEEE 802.3 type 10Base-T, 802.3u type 100Base-TX, and 802.3ab 1000Base-T standards:
- HP ProCurve Switch 2708 (J4898A)
- HP ProCurve Switch 2724 (J4897A)
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Q: Do the HP ProCurve series 2700 Switches support IEEE 802.3x flow control?
The following HP ProCurve series 2700 Switches support IEEE 802.3x flow control:
- HP ProCurve Switch 2708 (J4898A)
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Q: Why does a device with a fixed configuration of 100 Mbps at full duplex report high error rates when connected to the HP ProCurve series 2700 Switches?
The RJ-45 ports on the series 2700 Switches are configured as "Auto". Because the series 2700 Switches are compliant with the IEEE 802.3u standard, if a device connected to the switch has a fixed configuration, for example 100 Mbps, at full duplex, the switch will automatically sense the link speed, but will default to a communication of half duplex which could result in high error rates between the switch and the device. If the connected device is also configured to Auto, the switch will automatically negotiate both link speed and communication mode.
Make sure that all devices connected to the series 2700 Switches are configured to auto negotiate, or are configured to connect at half duplex.
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Q: How can I diagnose an HP ProCurve series 2700 Switch if I believe that it is not operating correctly?
Power cycling the switch or pressing the Reset button will cause the switch to perform its power-on self-test. The self-test passes if the Fault LED on the front of the switch goes off after approximately 6 seconds. If this LED stays on longer than 10 seconds, an error condition has been detected on the switch.
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Q: Where can I learn more about diagnosing the HP ProCurve series 2700 Switches using their LEDs?
You can learn more about diagnosing the HP ProCurve series 2700 Switches using their LEDs in the installation guide that shipped with your product.
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