nanog mailing list archives
Re: 100G QSFP28 DAC cables - experience
From: joel jaeggli <joelja () bogus com>
Date: Mon, 18 Sep 2017 14:03:43 -0700
On 9/6/17 00:17, Jiri Prochazka wrote:
Hi folks, I'm wondering if anyone have (either positive or negative) experience with 100G QSFP28 DAC cables?
I found the ones we tested to be substantially more finicky particularly at 5 meter then 10gig dacs, adding 4 x 25 sfp28 breakout on the other end probably isn't a help. We went with AOCs for the equivalent (3, 5 meter) lengths.
Is there anyone who is using 100G DAC in large scale and would recommend it (which means there are no issues compared to SR4 links)? I'm thinking about cables with lenght up to 1m, not more. We have had quite bad experience with 10G DAC in the past - but I do not want to be slave of the past.
10g dacs were less reliable then I would have preferred for 3 5 7 meter distances but they were tolerable especially if you leave the bundles alone, 25g was sufficiently less so at least in testing that we didn't try it in the field, being at the limits at 5m was a sufficient problemthat it ruled out some adjacent rack arrangements. so we're all optical for 25/100
Thank you for your thoughts! Jiri
Attachment:
signature.asc
Description: OpenPGP digital signature
Current thread:
- 100G QSFP28 DAC cables - experience Jiri Prochazka (Sep 14)
- Re: 100G QSFP28 DAC cables - experience Hugo Slabbert (Sep 14)
- Re: 100G QSFP28 DAC cables - experience Tyler Conrad (Sep 14)
- Re: 100G QSFP28 DAC cables - experience Brant Ian Stevens (Sep 14)
- RE: 100G QSFP28 DAC cables - experience Jameson, Daniel (Sep 14)
- RE: 100G QSFP28 DAC cables - experience Naslund, Steve (Sep 14)
- Re: 100G QSFP28 DAC cables - experience Tyler Conrad (Sep 14)
- Re: 100G QSFP28 DAC cables - experience Hugo Slabbert (Sep 14)