The fiber cable specification that we are looking for are the following:

1. Labeled with length of the cable using a durable material (vinyl) on both ends of the jumper wrapped around the cable (not flag style) approximately
6 inches from the strain relief.
2. Flexible jacket with 2mm thickness or less(i.e. Ber-tek or optical cable corporation make flexible jackets).
3. Durable connectors with different colors for ease of matching transmit to receive  (i.e. one strand uses a black end and one strand uses a red one) or 
have a label on each end with different colors per strand.
4. UPC (ultra polished connector).
5. Pre-tested jumpers for insertion and return loss measurements for all connectors (labeled on the package, paper or on a tag in the bag).
6. The duplex connector clip needs to hold the connectors securely for insertion, the connectors should not rotate, fall out, ride up...

NOTE: 

Preferred vendor that has been the best for us:
Fiberwave Corporation
Sal Agnello
Phone: 1-800-280-9011
Fax: 1-718-802-0116
Cell: 1-917-337-4259 
sagnello@fiberwave.com

Vendors that have been good:

Allen Tel Products Inc.
Anixter sells their products

Fiberwave Corporation
Sal Agnello
Phone: 1-800-280-9011
Fax: 1-718-802-0116
Cell: 1-917-337-4259 
sagnello@fiberwave.com

Timbercon
Diana Bullen
Inside Sales
dianab@timbercon.comwww.timbercon.com



Vendors that we have had bad jumpers from:



Phoenix Optix

Megladon Manufacturing Group

Montclair Fiber Optics Inc.