-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 1/4/2013 2:29 PM, Carlos Alvarez wrote:
On Fri, Jan 4, 2013 at 12:12 PM, Simon Woodhead <simon.woodhead at simwood.com>wrote:
Then there's the switches. Are they switches or are they hubs? If hubs, forget it. If switches, are they supporting full duplex or are you looking at 5Mb each way? Managed or unmanaged - I'd suspect unmanaged in which case you're not going to be able to do a dedicated voice VLAN or manage QoS. That all points to jitter of varying degrees given either congestion or simple serialisation delay.
I was careful to specify it would be a switched network. We'd be putting in new switches. The cabling is likely old, and was used with a standard PBX previously.
My question was really about experience, not theory, and some of you shared some very useful stuff. I know in theory it "should" work, and I know old cabling can have myriad problems. Reality often works out very different from theory. In all likelihood, if we took this route, it would have a contractual caveat that problems may be blamed on the cabling and they'd have to swap it out.
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I'll second a previous comment about hard-coding speed/duplex to 10Mbps. While it goes against the grain (or should) for most data folks to not use auto-negotiation, this is a case where you might run into trouble if you leave it on. I have experience reusing "old" CAT3 for switched ethernet (some installed for voice, some for data networking). The end devices will try (and is some cases may succeed) to negotiation 100Mbps; it caused nothing but trouble. Hard coded everything to 10M and things stabilized. A few of the more savvy users questioned us, but we explained the situation. Good luck. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iQEcBAEBAgAGBQJQ5zNNAAoJEBxhAh+LWUKiEPYH/1xBNwIPK45KzxR+qVb5/1ZG TbsSpBqDAwZJo8mJc/UB0kPXnl1f5SOko5erQLC3/wUlCqhbcL4WUdhbHuBIQJYO u1/AV/+/avu/gd5cKQ1EknoutLNXNBvCiYPuuz4awE8bAgkMMz3kWnpASPemQxxw omMn0dnedpmIidfBIRsyxClfZYVeCdBM3JhMrl8siFa9aYmmRHYeS+Cv6uws4Arh 2K17z8BjhDbQaYXXHyGLNZoNz0VYSEKxk5iZkC4d48msdxyPHk6YmYqw6ETJsc38 DDq3gGARVRDgWHTKD2ckT6qOIbCEgrc8czkNdt5lZAo3wFzlTau/c0x4P4OcPSo= =zj5A -----END PGP SIGNATURE-----