By Chris Brenton
For execs operating in complicated community environments, this article discusses tips to layout, enforce, and troubleshoot multiprotocol environments. It covers NetWare/IntranetWare, NT Server, Unix and Lotus Notes and covers all points of multiprotocol networking.
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Additional info for Multiprotocol Network Design and Troubleshooting
Sample text
NoteTwo quick notes here: First, while full duplex communications are possible with other cable types, they involve running two sets of cables rather than the one set that twisted-pair cable requires. Second, full duplex is topology dependent—some topologies (for example, 100VGANYLAN) do not support full duplex communications. 11. These connectors are crimp-ons; each requires a different size crimping tool. RJ-11 is the smaller six-pin jack that is commonly used for telephone connections. RJ-45 is the larger of the two, has eight pins, and is the one most commonly used for data connections.
Noise Resistance Twisted-pair cable is more susceptible to electromagnetic and radio frequency interference than thinnet or fiber. I’ve seen some strange network problems resolved by simply moving ceiling cables away from fluorescent lighting. If you’re pulling twisted-pair cable, make sure the runs are as far away as possible from all noise sources. A few feet is usually sufficient, depending on the strength of the noise source. 3 shows the specifications for twisted-pair cable. 3 Twisted-Pair Cable Specifications Item Specification Transmission source electrical Topologies Supported 10 Mb, 100 Mb and 1 Gb Ethernet, FDDI, ATM Maximum cable length 325 feet (100 M) Minimum cable length none Maximum number of stations 2 per cable, 1024 per logical segment Maximum number of segments Dependent on topology: 10 Mb Ethernet is 5 repeated segments with only three populated.
The two most popular specifications are CAT 3 and CAT 5. While the two cables may look physically identical, CAT 3 has a lower specification that can cause errors if pushed to a faster transmission rate. NoteAlways certify your cables with a tester that will check them at the transmission speed you will be using. I’ve seen quite a few wire runs that test fine at 10 Mbps but fall apart when the transmission rate is pushed to 100 Mbps. You should examine every link in the chain while trying to maintain a certain category of wiring.