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| Thread ID: 127422 | 2012-10-21 23:15:00 | All Cat 5e patch cables can do Gigabit Ethernet right?...Maybe not. | Sherman (9181) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 1308012 | 2012-10-22 09:53:00 | Stranded is what's used for most patch leads. If you use solid, the wires break after bending a few times. Solid cable's only meant for permanent wiring.+1 :thumbs: | wainuitech (129) | ||
| 1308013 | 2012-10-22 20:13:00 | Cheap at half the price... | Gobe1 (6290) | ||
| 1308014 | 2012-10-22 20:54:00 | Just a Nitpick, the plug in the picture is not CAT 5e. It can't be because the standard specifies all 8 wires be connected. A Cat 5 or higher cable must have all 8 wires in it or it's not Cat 5 also. What it is is a cheap 100M cable supplied because that's all that's needed for the 100M ports typically available on the routers they are supplied with. Another nitpick, if you make your own cables they can't officialy be CAT6 because the standard doesn't allow for user installed plugs. They still work perfectly they just aren't officially CAT 6 rated. Also CAT 5 is perfectly capable of gigabit as is cat 5e and CAT 6, the differences between 5 and 5e are minor and generally make no difference in a home enviroment, CAT 6 has improved the cable design to reduce crostalk etc and is definately better but again it doesn't usually matter in a home enviroment. Even ordinary old CAT5 can theoretically achieve gigabit speeds for up to 100M in length, the improvements are mainly to do with reliabilty and the problems introduced with a lot of cables run close together for long distances. In the average house where cable runs are usually limited to 1 or two cables and don't normally exceed 20-30M all 3 standards generally perform identically. For short distances you can get away with all kinds of dodgy cabling, and at 100M even more so. The 4wire telephone cable used in most houses today is called homelan by the manufacturer and for 100M ethernet actually performs very close to CAT5 cabling so it can be used for a cheap network in a pinch. |
dugimodo (138) | ||
| 1308015 | 2012-10-22 20:55:00 | DealExtreme ??? | Gobe1 (6290) | ||
| 1308016 | 2012-10-23 00:38:00 | Just a Nitpick, the plug in the picture is not CAT 5e. It can't be because the standard specifies all 8 wires be connected. A Cat 5 or higher cable must have all 8 wires in it or it's not Cat 5 also. What it is is a cheap 100M cable supplied because that's all that's needed for the 100M ports typically available on the routers they are supplied with. Another nitpick, if you make your own cables they can't officialy be CAT6 because the standard doesn't allow for user installed plugs. They still work perfectly they just aren't officially CAT 6 rated. Also CAT 5 is perfectly capable of gigabit as is cat 5e and CAT 6, the differences between 5 and 5e are minor and generally make no difference in a home enviroment, CAT 6 has improved the cable design to reduce crostalk etc and is definately better but again it doesn't usually matter in a home enviroment. Even ordinary old CAT5 can theoretically achieve gigabit speeds for up to 100M in length, the improvements are mainly to do with reliabilty and the problems introduced with a lot of cables run close together for long distances. In the average house where cable runs are usually limited to 1 or two cables and don't normally exceed 20-30M all 3 standards generally perform identically. For short distances you can get away with all kinds of dodgy cabling, and at 100M even more so. The 4wire telephone cable used in most houses today is called homelan by the manufacturer and for 100M ethernet actually performs very close to CAT5 cabling so it can be used for a cheap network in a pinch. Tell that to the cable manufacturer... That particular cable had cat 5 printed along it. The other one had cat 5e printed. |
Sherman (9181) | ||
| 1308017 | 2012-10-23 06:01:00 | I always thought that Ethernet, be it 100 m/bit or Gigabit, was the same terminations and used the same pairs? So, if 1000BASE-T uses all the pairs for data transfer, does that mean that you can't do POE over 1000BASE-T? |
pine-o-cleen (2955) | ||
| 1308018 | 2012-10-23 06:05:00 | Seems you can do POE over 1000BASE-T! Standards-based power over Ethernet is implemented following the specifications in IEEE 802.3af-2003 (which was later incorporated as clause 33 into IEEE 802.3-2005) or the 2009 update, IEEE 802.3at. A phantom power technique is used to allow the powered pairs to also carry data. This permits its use not only with 10BASE-T and 100BASE-TX, which use only two of the four pairs in the cable, but also with 1000BASE-T (gigabit Ethernet), which uses all four pairs for data transmission. This is possible because all versions of Ethernet over twisted pair cable specify differential data transmission over each pair with transformer coupling; the DC supply and load connections can be made to the transformer center-taps at each end. Each pair thus operates in common mode as one side of the DC supply, so two pairs are required to complete the circuit. The polarity of the DC supply may be inverted by crossover cables; the powered device must operate with either pair: spare pairs 4–5 and 7–8 or data pairs 1–2 and 3–6. Polarity is required on data pairs, and ambiguously implemented for spare pairs, with the use of a diode bridge |
pine-o-cleen (2955) | ||
| 1308019 | 2012-10-23 08:44:00 | You can yes, we are looking at cisco ip phones that run off PoE and have an 1gb switch on them so you only need one cable for your phone and pc. | Alex B (15479) | ||
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