EXHIBIT A

JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

This agreement is made pursuant to Rule 13d-1(k)(1) under the Exchange Act by and among the parties listed below, each referred to herein as a “Joint Filer”.  The Joint Filers agree that a statement of beneficial ownership as required by Section 13(d) of the Exchange Act and the Rules thereunder may be filed on each of their behalf on Schedule 13D or Schedule 13G, as appropriate, with respect to their ownership of the Common Stock, par value $0.001 per share, of Sycamore Networks, Inc., and that said joint fil­ing may there­af­ter be amend­ed by further joint fil­ings.  The Joint Filers state that they each satis­fy the require­ments for making a joint filing under Rule 13d-1.  This Agree­ment may be exe­cuted in any number of coun­ter­parts, all of which taken togeth­er shall con­stitute one and the same in­strument.

IN WITNESS WHEREOF, the undersigned hereby exe­cute this Joint Filing Agreement as of the 13th day of February, 2012.

/s/ Daniel E. Smith
Daniel E. Smith
/s/ Elizabeth G. Riley
Elizabeth G. Riley
PLATYKO PARTNERS, L.P.
By:	/s/ Daniel E. Smith
	Name:  Daniel E. Smith
	Title:    Managing Agent