|
Author
|
Topic: SBC Global DSL SUCKS!
|
|
|
|
|
|
|
Joel N. Weber II
Expert Film Handler

Posts: 115
From: Somerville, MA, USA
Registered: Dec 2005
|
posted 05-14-2007 07:42 PM
Cable modems aren't necessarily perfect either; I've occasionally experienced rainy days when my cable modem has stopped working acceptably, and every couple months my ssh tunnels drop for no obvious good reason. However, it's somewhat difficult to really blame them when it's consumer grade service, and I haven't gotten around to complaining to them about the problem.
I've had lots of experience with VOIP call quality problems at work; on the other hand, having my work phone number also ring at home sometimes turns out to be very convenient. I've had occasional dropouts taking work calls at home, but the most noticeable ones came from VPN routers changing the encryption keys, which they had been configured to do once an hour or so. I've switched routers since I carefully did that experiment, and then haven't used VOIP across the big bad Internet as much since then, so I'm not sure to what extent changing routers may have fixed that problem.
When you're running VOIP calls between offices over Internet T1 circuits, some sort of priority queuing turns out to be extremely important. A T1 circuit is 1.5 million bits per second. Most links tend to be configured for packets with a maximum size of 1500 bytes; this works out to 8 miliseconds to transmit a single full-sized packet. The phones we use seem to be set up to deal with 40 miliseconds of jitter. You don't want your voice traffic waiting in line behind too many 8 milisecond long line packets.
I sometimes find myself calling someone who works for a CLEC that isn't really terribly friendly with Verizon, and it's funny how if he and I are both at home, we end up talking over Verizon POTS lines on both ends, even though both of us have employers who provide VOIP phones we could be using at home instead. There's something about the audio quality...
| IP: Logged
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|