nanog mailing list archives
Re: Famous operational issues
From: Paul Ebersman <list-nanog2 () dragon net>
Date: Thu, 18 Feb 2021 16:24:14 -0700
warren> 2: A somewhat similar thing would happen with the Ascend TNT warren> Max, which had side-to-side airflow. These were dial termination warren> boxes, and so people would install racks and racks of them. The warren> first one would draw in cool air on the left, heat it up and warren> ship it out the right. The next one over would draw in warm air warren> on the left, heat it up further, and ship it out the warren> right... Somewhere there is a fairly famous photo of a rack of warren> TNT Maxes, with the final one literally on fire, and still warren> passing packets. The Ascend MAX (TNT was the T3 version, max took 2 T1s) was originally an ISDN device. We got the first v.34 rockwell modem version for testing. An individual card had 4 daughter boards. They were burned in for 24 hours at Ascend, then shipped to us. We were doing stress testing in Fairfax VA. Turns out that the boards started to overheat at about 30 hours and caught fire a few hours after that... Completely melted the daughterboards. They did fix that issue and upped the burnin test period to 48 hours. And yeah, they vented side to side. They were designed for enclosed racks where are flow was forced up. We were colocating at telco POPs so we had to use center mount open relay racks. The air flow was as you describe. Good time. Had by all... Both we (UUNET, for MSN and Earthlink) and AOL were using these for dialup access. 80k ports before we switched to the TNTs, 3+ million ports on TNTs by the time I stopped paying attention.
Current thread:
- Re: Famous operational issues, (continued)
- Re: Famous operational issues George Herbert (Feb 18)
- Re: Famous operational issues Henry Yen (Feb 20)
- Re: Famous operational issues Alain Hebert (Feb 22)
- Re: Famous operational issues Bruce H McIntosh (Feb 22)
- RE: Famous operational issues Tony Wicks (Feb 22)
- Re: Famous operational issues bzs (Feb 22)
- Re: Famous operational issues sronan (Feb 22)
- Re: Famous operational issues Warren Kumari (Feb 23)
- Re: Famous operational issues Tony Finch (Feb 22)
- Re: Famous operational issues Christopher Morrow (Feb 22)
- Re: Famous operational issues Paul Ebersman (Feb 18)
- Re: Famous operational issues Randy Bush (Feb 18)
- Re: Famous operational issues Andy Ringsmuth (Feb 18)
- Re: Famous operational issues Jethro R Binks (Feb 22)
- Re: Famous operational issues Mark Tinka (Feb 18)
- Re: Famous operational issues Suresh Ramasubramanian (Feb 18)
- Re: Famous operational issues Sabri Berisha (Feb 19)
- Re: Famous operational issues Suresh Ramasubramanian (Feb 19)
- Re: Famous operational issues Mark Tinka (Feb 19)
- Re: Famous operational issues Jen Linkova (Feb 19)
- Re: Famous operational issues Andrey Kostin (Feb 19)