Posted by Scott Laird
Fri, 11 Feb 2005 21:52:02 GMT
As regular readers know, I recently turned up a new DSL circuit at home, replacing an older, slower line that Verizon had refused to upgrade for months. As part of the upgrade process, I needed to buy a new DSL modem. Instead of using an external DSL modem (DSL-Ethernet bridge would probably be more accurate, but “modem” seems to have stuck), I decided to buy a Sangoma S518 PCI ADSL modem. I had two main reasons for preferring this internal modem to a generic external model:
- Better control over upstream buffering, for better VoIP QoS.
- Better visibility into the modem’s state, so I can syslog minor outages and notice things like speed changes.
I chose the Sangoma model instead of a cheap, generic card because the manufacturer strongly supports its use with Linux, and a number of people on the Asterisk-Users mailing list have recommended it. I paid $115 plus shipping from BSD Mall.
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Posted in Computer Networking | Tags adsl, dsl, linux, neetworking, review, s518, sangoma | 6 comments
Posted by Scott Laird
Wed, 09 Feb 2005 23:21:15 GMT
My DSL modem showed up yesterday, so I dropped it into my gateway box and fired it up. It immediately reported that it was unable to train; there was nothing to talk to on the other end of the phone line yet. Since my official install day is still a couple days out, that didn’t surprise me. Then this morning, I saw this in the logs:
Feb 9 08:19:22 guam kernel: wanpipe1: ADSL Link connected (Down 1792 kbps, Up 448 kbps)
Feb 9 08:19:30 guam kernel: wanpipe1: Link connected!
Feb 9 08:41:03 guam kernel: klogd 1.4.1#11, log source = /proc/kmsg started.
The gap between the second and third lines is the problem–the box went down, hard, right after the DSL line came up. On the other hand, it looks like I’m provisioned above 1.5/384 on the ATM side. Assuming a 20% cell tax, this gives me a usable connection of around 1430 kbps down and 360 kbps up, which isn’t too bad. Now I just have to keep the thing from crashing. I’m rolling my ADSL drivers back from the beta version that I’d started with to the most recent release; hopefully that’ll be good enough to fix my problem.
Posted in Computer Networking | Tags atm, dsl, linux, sangoma | no comments
