SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. ___)*

Calix, Inc.

(Name of Issuer)

Common Stock, par value $0.025 per share

(Title of Class of Securities)

13100M 50 9

(CUSIP Number)

December 31, 2010

(Date of Event Which Requires Filing of This Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨

Rule 13d-1(b)

¨

Rule 13d-1(c)

x

Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

1.

	CUSIP No. 13100M 50 9				13G	Page 2 of 8 Pages
1.		Names of Reporting Persons Foundation Capital V, L.P.
2.		Check the Appropriate Box if a Member of a Group (see instructions)
		(a)   ¨
		(b)   x (1)
3.		SEC USE ONLY
4.		Citizenship or Place of Organization Delaware, United States of America
Number of Shares Beneficially Owned by Each Reporting Person With:			5.	Sole Voting Power 0 shares
			6.	Shared Voting Power 2,943,440 shares of Common Stock (2)
			7.	Sole Dispositive Power 0 shares
			8.	Shared Dispositive Power 2,943,440 shares of Common Stock (2)
9.		Aggregate Amount Beneficially Owned by Each Reporting Person 2,943,440 shares of Common Stock (2)
10.		Check if the Aggregate Amount in Row (9) Excludes Certain Shares (see instructions)					¨
11.		Percent of Class Represented by Amount in Row 9 7.9% (3)
12.		Type of Reporting Person (see instructions) PN

(1)

This statement on Schedule 13G is filed by Foundation Capital V, L.P. (“FC5”), Foundation Capital V Principals Fund, L.L.C. (“FC5P”) and Foundation Capital Management Co. V, L.L.C. (“FCM5,” together with FC5 and FC5P, collectively, the “Reporting Persons”).  The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

(2)

Includes (i) 2,880,916 shares held by FC5; and (ii) 62,524 shares held by FC5P.  FCM5 serves as the sole general partner of FC5 and serves as the manager of FC5P.  As such, FCM5 possesses voting and dispositive power over the shares held by FC5 and FC5P, and may be deemed to have indirect beneficial ownership of the shares held by FC5 and FC5P.  FCM5 owns no securities of the Issuer directly.  The information with respect to the ownership of the Common Stock by the Reporting Persons filing this statement on Schedule 13G is provided as of December 31, 2010.

(3)

This percentage is calculated based upon 37,372,663 shares of the Common Stock outstanding (as of October 14, 2010), as set forth in the Issuer’s most recent Form 10-Q filed with the Securities and Exchange Commission on October 22, 2010.

2.

	CUSIP No. 13100M 50 9				13G	Page 3 of 8 Pages
1.		Names of Reporting Persons Foundation Capital V Principals Fund, L.L.C.
2.		Check the Appropriate Box if a Member of a Group (see instructions)
		(a)   ¨
		(b)   x (1)
3.		SEC USE ONLY
4.		Citizenship or Place of Organization Delaware, United States of America
Number of Shares Beneficially Owned by Each Reporting Person With:			5.	Sole Voting Power 0 shares
			6.	Shared Voting Power 2,943,440 shares of Common Stock (2)
			7.	Sole Dispositive Power 0 shares
			8.	Shared Dispositive Power 2,943,440 shares of Common Stock (2)
9.		Aggregate Amount Beneficially Owned by Each Reporting Person 2,943,440 shares of Common Stock (2)
10.		Check if the Aggregate Amount in Row (9) Excludes Certain Shares (see instructions)					¨
11.		Percent of Class Represented by Amount in Row 9 7.9% (3)
12.		Type of Reporting Person (see instructions) OO

(1)

This statement on Schedule 13G is filed by the Reporting Persons.  The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

(2)

Includes (i) 2,880,916 shares held by FC5; and (ii) 62,524 shares held by FC5P.  FCM5 serves as the sole general partner of FC5 and serves as the manager of FC5P.  As such, FCM5 possesses voting and dispositive power over the shares held by FC5 and FC5P, and may be deemed to have indirect beneficial ownership of the shares held by FC5 and FC5P.  FCM5 owns no securities of the Issuer directly.  The information with respect to the ownership of the Common Stock by the Reporting Persons filing this statement on Schedule 13G is provided as of December 31, 2010.

(3)

This percentage is calculated based upon 37,372,663 shares of the Common Stock outstanding (as of October 14, 2010), as set forth in the Issuer’s most recent Form 10-Q filed with the Securities and Exchange Commission on October 22, 2010.

3.

	CUSIP No. 13100M 50 9				13G	Page 4 of 8 Pages
1.		Names of Reporting Persons Foundation Capital Management Co. V, L.L.C.
2.		Check the Appropriate Box if a Member of a Group (see instructions)
		(a)   ¨
		(b)   x (1)
3.		SEC USE ONLY
4.		Citizenship or Place of Organization Delaware, United States of America
Number of Shares Beneficially Owned by Each Reporting Person With:			5.	Sole Voting Power 0 shares
			6.	Shared Voting Power 2,943,440 shares of Common Stock (2)
			7.	Sole Dispositive Power 0 shares
			8.	Shared Dispositive Power 2,943,440 shares of Common Stock (2)
9.		Aggregate Amount Beneficially Owned by Each Reporting Person 2,943,440 shares of Common Stock (2)
10.		Check if the Aggregate Amount in Row (9) Excludes Certain Shares (see instructions)					¨
11.		Percent of Class Represented by Amount in Row 9 7.9% (3)
12.		Type of Reporting Person (see instructions) PN

(1)

This statement on Schedule 13G is filed by the Reporting Persons.  The Reporting Persons expressly disclaim status as a “group” for purposes of this Schedule 13G.

(2)

Includes (i) 2,880,916 shares held by FC5; and (ii) 62,524 shares held by FC5P.  FCM5 serves as the sole general partner of FC5 and serves as the manager of FC5P.  As such, FCM5 possesses voting and dispositive power over the shares held by FC5 and FC5P, and may be deemed to have indirect beneficial ownership of the shares held by FC5 and FC5P.  FCM5 owns no securities of the Issuer directly.  The information with respect to the ownership of the Common Stock by the Reporting Persons filing this statement on Schedule 13G is provided as of December 31, 2010.

(3)

This percentage is calculated based upon 37,372,663 shares of the Common Stock outstanding (as of October 14, 2010), as set forth in the Issuer’s most recent Form 10-Q filed with the Securities and Exchange Commission on October 22, 2010.

4.

5.

Item 4.  Ownership.  The following information with respect to the ownership of the Common Stock by the Reporting Persons filing this statement on Schedule 13G is provided as of December 31, 2010:

(1)

Represents the number of shares of Common Stock currently underlying all Securities held by the Reporting Persons.

(2)

FCM5 serves as the sole general partner of FC5 and the manager of FC5P.  As such, FCM5 possesses voting and dispositive power over the shares held by FC5 and FC5P, and may be deemed to have indirect beneficial ownership of the shares held by FC5 and FC5P.  FCM5 owns no securities of the Issuer directly.  

(3)

This percentage is calculated based upon 37,372663 shares of the Common Stock outstanding (as of October 14, 2010), as set forth in the Issuer’s most recent Form 10-Q filed with the Securities and Exchange Commission on October 22, 2010.

Item 5. Ownership of 5 Percent or Less of a Class

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following  o

Item 6. Ownership of More than 5 Percent on Behalf of Another Person

Not applicable.

Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.

Not applicable.

Item 8. Identification and Classification of Members of the Group

Not applicable.

Item 9. Notice of Dissolution of a Group

Not applicable.

Item 10. Certification

Not applicable.

6.

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated:  February 11, 2011

Foundation Capital Management Co. V, L.L.C.

By:       /s/ William B. Elmore                           

Member

Foundation Capital V, L.P.

By:

Foundation Capital Management Co. V, L.L.C.

its General Partner

By:       /s/ William B. Elmore                           

Member

Foundation Capital V Principals Fund, L.L.C.

By:

Foundation Capital Management Co. V, L.L.C.

its Manager

By:       /s/ William B. Elmore                           

Member

Attention:

Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001)

7.

AGREEMENT

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of the shares of Common Stock of Calix, Inc.

Dated:  February 11, 2011

Foundation Capital Management Co. V, L.L.C.

By:       /s/ William B. Elmore                           

Member

Foundation Capital V, L.P.

By:

Foundation Capital Management Co. V, L.L.C.

its General Partner

By:       /s/ William B. Elmore                           

Member

Foundation Capital V Principals Fund, L.L.C.

By:

Foundation Capital Management Co. V, L.L.C.

its Manager

By:       /s/ William B. Elmore                           

Member

8.