Aha, micro seconds in networking terms is normally written usecs or us (actually it's the greek letter mu as in ulaw) rather than ms which are milliseconds seconds - what had me puzzled was that it was stated that this could harm the voice path!
> The difference can also cause unnecessary delays and therefor echo in the > path. For example, procurve switches typically have 13ms switching time, > the high-end netgears about 21ms. As soon as you stack a couple of > switches you are talking 26ms vs 42ms extra delay in the path! There is then only 8 usecs between the two switches, how on earth would this make any difference to the voice path at all? Let alone induce any echo... Obviously the originally poster didn't understand the difference. And based on this, he's probably advising people not to use Netgear switches for voice, oh dear. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Watkins, Bradley Sent: Friday, 24 February 2006 10:08 PM To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: RE: [Asterisk-Users] What business IP phone to use It must be microseconds that is being quoted, as even the 2626 that you mention lists a less than 13.3 microsecond latency. - Brad -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Ankers Sent: Thursday, February 23, 2006 6:54 PM To: 'Asterisk Users Mailing List - Non-Commercial Discussion' Subject: RE: [Asterisk-Users] What business IP phone to use Are you sure those switch figures are right? 16ms delay in the switch path sounds a bit long. Cisco's mid-range switches like the 2950 have switching times measured in micro seconds. Then again a 2626 procurve is only around $700. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Conrad Wood Sent: Friday, 24 February 2006 7:50 AM To: [email protected] Subject: RE: [Asterisk-Users] What business IP phone to use > Simple formula: > > 1. Total Revenue > 2. % of revenue derived from phone usage > 3. =Cost of downtime by using SoHo or consumer gear. > > It's not a question of if a SoHo or low cost device will screw up, it > is a question of when. This is 23 years of experience talking. > > Where I work, the value of #3 above is $16 Cdn a *second*. We are > below 500 > employees, so we fall into the SMB segment. Sometimes I'm appalled by > statements that a $700 switch or a $400 phone isn't worth it. Huh?? > Maybe in Absolutely right! for something as critical as switches & cabling I always recommend to spend real money. Don't ever try to save money any equipment that is required to operate the business. (Had very good experience with HP procurves over the last 10 years or so). There is no point buying netgear or other low-cost switches for a business ever. The cost saving of being able to pin-point a cabling/NIC/bandwidth problem down to the port on the switch easily and quickly is wonderful. Combined with SNMP and all the other goodies good switches come with, our clients save a lot of money by paying me less for my time ( d'oh ;-) ). The difference can also cause unnecessary delays and therefor echo in the path. For example, procurve switches typically have 13ms switching time, the high-end netgears about 21ms. As soon as you stack a couple of switches you are talking 26ms vs 42ms extra delay in the path! I see no reason however to spend $400 on a single phone though, because if a single phone breaks, it's not going to bring your business to a standstill, is it? (I guess unless you only have one in the first place ;-) ) conrad _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it. _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
