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The Lounge War Stories How not to install fibre links between data centres! Post 302686933 by gull04 on Wednesday 15th of August 2012 04:49:57 PM
Old 08-15-2012
How not to install fibre links between data centres!

Hi Folks,

A couple of years ago we had to replace the core switches between two of our data centres, a simple task for the most part - these new switches would be state of the art Cisco Catalyst units.

The link between the two sites was a dark fibre, with 8Gb bandwidth running full duplex over a redundant cable pair. It was quite a surprise when we started to tidy up the cables to find this - see the attached images.

The cables comprised two male to male cables, with the ends joined with Bluetack. I'm amazed that it worked for so long. - Actually I'm amazed it worked at all!

Regards

Dave
How not to install fibre links between data centres!-bluetack_fairyjpg
How not to install fibre links between data centres!-bluetack_fairy_againjpg

Last edited by gull04; 08-15-2012 at 09:33 PM..
 

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APCSMART(8)						      Network UPS Tools (NUT)						       APCSMART(8)

NAME
apcsmart - Driver for American Power Conversion Smart Protocol UPS equipment NOTE
This man page only documents the hardware-specific features of the apcsmart driver. For information about the core driver, see nutups- drv(8). SUPPORTED HARDWARE
apcsmart should recognize all APC models that use a serial protocol at 2400 bps. This is primarily the Smart-UPS and Matrix-UPS lines, but some Back-UPS Pro models are also supported. Some older hardware may only report a handful of variables. This is usually not a bug - they just don't support anything else. CABLING
This driver expects to see a 940-0024C cable or a clone by default. You can switch to the 940-0095B dual-mode cable support with the cable= definition described below. If your 940-0024C cable is broken or missing, use this diagram to build a clone: http://www.exploits.org/nut/library/cables/940-0024C.jpg EXTRA ARGUMENTS
This driver supports the following optional settings in the ups.conf(5): cable=940-0095B Configure the serial port for the APC 940-0095B dual-mode cable. sdtype=num Use shutdown type num, according to this table: 0: soft shutdown or powerdown, depending on battery status 1: soft shutdown followed by powerdown 2: instant power off 3: power off with grace period Modes 0 and 1 will power up the load when power returns. Modes 2 and 3 will keep the load turned off when the power returns. BUGS
Some older APC UPS models return bogus data in the status register during a front panel test. This is usually detected and discarded, but some other unexpected values have occasionally slipped through. AUTHOR
Russell Kroll SEE ALSO
The core driver: nutupsdrv(8) Internet resources: The NUT (Network UPS Tools) home page: http://www.exploits.org/nut/ NUT mailing list archives and information: http://lists.exploits.org/ Tue Oct 22 2002 APCSMART(8)
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