Jay Wilton
2004-Oct-20 01:08 UTC
[Asterisk-Users] cheap gig switch? smc, netgear, or 3com?
Hello, The Smc 8508T goes for about $95, jumbo frame support, lifetime warranty but no QOS. The Netgear GS608 is $ 100, no jumbo frames, 1 year warranty, QOS, gig latency 10U max. The 3com switch reviews that I read were not happy. Does anyone hate or love their home switch? I doubt the jumbo frame support would help voip traffic, but it seems like it wouldn't hurt. I was planning on doing the QOS on linux. Gig support is wanted for file transfers and the future. Thanks to all you nice asterisk people and a few of the mean ones. Jay __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail
dean collins
2004-Oct-20 05:39 UTC
[Asterisk-Users] cheap gig switch? smc, netgear, or 3com?
I have one of these, works great but failed about 6 months into it's life, was replaced on the spot (in Australia (I'm originally from there) but you had to drive it to them with the original receipt for the handover). Does anyone know if this is a worldwide warranty? Has anyone in NY tried to claim? Where was it etc? Cheers, Dean -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Jay Wilton Sent: Wednesday, October 20, 2004 4:08 AM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] cheap gig switch? smc, netgear, or 3com? Hello, The Smc 8508T goes for about $95, jumbo frame support, lifetime warranty but no QOS. The Netgear GS608 is $ 100, no jumbo frames, 1 year warranty, QOS, gig latency 10U max. The 3com switch reviews that I read were not happy. Does anyone hate or love their home switch? I doubt the jumbo frame support would help voip traffic, but it seems like it wouldn't hurt. I was planning on doing the QOS on linux. Gig support is wanted for file transfers and the future. Thanks to all you nice asterisk people and a few of the mean ones. Jay __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
dean collins
2004-Oct-20 17:32 UTC
[Asterisk-Users] cheap gig switch? smc, netgear, or 3com?
Lol, this email was sitting in my inbox as I was reading this. It's not about bandwidth! Learn why application performance can't be solved with bandwidth or compression. October 21 @ 4 p.m. Eastern/1 p.m. Pacific Duration: 30 minutes Register to Attend ------------------------------------------------------------------------ -------- Dear Colleague, Contrary to popular belief, buying more bandwidth or adding compression technology will not help your application performance very much if wide area networks (WANs) are involved. Learn how Fanning/Howey Associates, the nation's top-ranked firm in educational facilities planning and design, performed a hands-on test to justify implementing appliances that accelerate applications over the WAN, while optimizing your existing bandwidth. Discover how this leads to drastic improvements in productivity, load balancing of projects between remote offices, and successful site consolidation. This eSeminar will help you understand why your applications perform poorly on WANs and how you can improve it! -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Scott Laird Sent: Wednesday, October 20, 2004 8:06 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] cheap gig switch? smc, netgear, or 3com? On Oct 20, 2004, at 4:17 PM, Jay Wilton wrote:> > What is the most important feature for VoIP quality: > latency, qos, vlan? I'm leaning towards least latency with > qos and/or vlans at the linux router. Might be my best > shot for an inexpensive gig switch ($100). > > I have only seen the qos (802.1p) in the Netgear gs608, but > reviews of Netgear are terrifying (too light, breaks, hot, > no support, warranty is a problem after 90 days).Frankly, the easiest way to get good voice quality in a small network is to overprovision everything. Never run any link that will have to carry voice traffic over 20-30% utilization, and you'll probably never see a problem. My gut instinct says that the biggest problem is going to be inter-switch links; if everything runs into a single switch, particularly a GigE switch, I just can't see problems developing, unless you're pushing so much traffic that your cheap switch runs completely out of juice. If overprovisioning is too expensive (or if a choppy call every few days is unacceptable), *then* QoS starts to come into play. As long as VoIP packets get priority, it shouldn't really matter how full the links are. However, this is more work. You need to make sure that all VoIP packets are tagged as high priority, either in a port-by-port basis in the switch or by using 802.1p support in devices. Just because your switch says "QoS" on the box doesn't mean that it'll magically know which packets are most important. Back to your question: the most important feature for VoIP quality in a LAN is almost certainly packet loss, followed by latency. VoIP is much more sensitive to lost packets then any other network service that I'm used to running. In a LAN, you *should* only get packet loss when a link is nearing capacity--the switch should have a small buffer, but if you send too many packets at once, something has to get dropped. With more expensive switches, you'll see latency start increasing before packets actually get dropped. With really cheap switches, there may not be enough of a buffer to really matter--I've never tried measuring it. By increasing the speed of the links, you decrease the probability of getting a short burst that overwhelms that switch's buffers. it's just statistics. If you have a decent switch, then you should be able to monitor for dropped packets. With Cisco switches running IOS (29xx, etc), look at the 'Output queue' line in 'show interface'. If it reports 0 drops, then you're probably fine. Other switch types should be similar. Scott _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
steve szmidt
2004-Oct-23 13:44 UTC
[Asterisk-Users] cheap gig switch? smc, netgear, or 3com?
On Wednesday 20 October 2004 04:08 am, Jay Wilton wrote:> Hello, > > The Smc 8508T goes for about $95, jumbo frame support, > lifetime warranty but no QOS. The Netgear GS608 is $ 100, > no jumbo frames, 1 year warranty, QOS, gig latency 10U max. > The 3com switch reviews that I read were not happy. Does > anyone hate or love their home switch? > > I doubt the jumbo frame support would help voip traffic, > but it seems like it wouldn't hurt. I was planning on > doing the QOS on linux. Gig support is wanted for file > transfers and the future. Thanks to all you nice asterisk > people and a few of the mean ones. > > JayHaha, "a few of the mean ones"! I love it! : ) I prefer managed switches but they are all so pricey. The thing to go for with any switch for VoIP use is the ability to deal with QoS. Most of the routers are configured to support it and it does work. -- Steve Szmidt "They that would give up essential liberty for temporary safety deserve neither liberty nor safety." Benjamin Franklin