Exhibit 10.77
NORTEL NETWORKS
SUPPLEMENTARY EXECUTIVE RETIREMENT PLAN
ADOPTION OF AMENDMENT
WHEREAS Nortel Networks Limited (“Nortel”) sponsors and maintains the Nortel
Networks Supplementary Executive Retirement Plan (the “Plan”);
AND WHEREAS Nortel reserves the right to amend the Plan pursuant to section 6.1
of the Plan;
AND WHEREAS the Board of Directors of Nortel (“Board”) approved, in its meeting
of June 2, 2006, important changes to the Plan, which were announced June 27,
2006;
AND WHEREAS those changes are reflected and detailed in the attached amendment
to the Plan;
AND WHEREAS the amendments were proposed by the Retirement Plan Committee
(“RPC”), a Nortel management committee, to which Nortel has delegated the
authority to act as administrator of the Plan;
AND WHEREAS the amendments proposed by the RPC have been reviewed and approved
by the additional committees and entities required for approval of such an
amendment pursuant to the applicable governance mandates for the Plan, with the
final approval granted by the Pension Investment Committee;
NOW THEREFORE, the following amendments to the Plan are approved, such
amendments to be effective January 1, 2008, and the following individuals are
hereby authorized to execute such amendments: any officer of Nortel. Such
individuals are also authorized to execute and give effect to a subsequent
restatement of the Plan which incorporates these amendments and the amendments
adopted to achieve compliance with Section 409A of the U. S. Internal Revenue
Code.
1. Section 2 of the Plan is amended by adding, in the appropriate alphabetical
order, the following definitions.
“Earnings Termination Date” means:

  (a)   in the case of a Grandfathered Executive, the date of termination of
employment;     (b)   in the case of a Temporarily Grandfathered Executive who
does not become a Grandfathered Executive and who does not return to active
employment with the Corporation or an affiliate or subsidiary of the
Corporation, the date of termination of employment;     (c)   in the case of a
Temporarily Grandfathered Executive who does not become a Grandfathered
Executive and who returns to active employment, on a particular

 

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Supplementary Executive Retirement Plan
Amendment
Page 2 of 4

      date, with the Corporation or an affiliate or subsidiary of the
Corporation, the particular date;

  (d)   in any other case, the earlier of the date of termination of employment
and December 31, 2007.”

““Grandfathered Executive” means an Executive who, as of December 31, 2007:

  (a)   has at least 30 Actual Years of Service;     (b)   has attained age 55,
where the total of the Executive’s age and Actual Years of Service equals at
least 70 years; or     (c)   has attained age 60;

and includes

  (d)   an Executive who, on June 27, 2006, was on a special leave of absence
before retirement, as provided under the Corporation’s policies with respect to
such leaves of absence; and     (e)   a Temporarily Grandfathered Executive who
returns to active employment with the Corporation at a particular date and who,
as of December 31, 2007, meets the requirements of any of paragraphs (a) to
(c) of this definition.”

““Temporarily Grandfathered Executive” means an Executive who, as of
December 31, 2007, is absent from work and is being paid benefits under the
Corporation’s Long Term Disability Plan. An Executive ceases to be a Temporarily
Grandfathered Executive on the date, if any, that the Executive returns to
active employment with the Corporation or an affiliate or subsidiary of the
Corporation.”
2. Section 2 of the Plan is amended by adding to the definition “Actual Years of
Service” the following paragraph:
““Actual Years of Service” does not include:

  (a)   in the case of a Temporarily Grandfathered Executive who does not become
a Grandfathered Executive, any period after the Executive returns to active
employment with the Corporation or an affiliate or subsidiary of the
Corporation;     (b)   in the case of an Executive who is neither a
Grandfathered Executive nor an Executive described in paragraph (a) of this
definition, any period after 2007.”

3. Section 2 of the Plan is amended by adding to the definition “Capital
Accumulation and Retirement Program” the following sentence:
“After 2007, the Investor Option will no longer be offered.”
4. Section 2 of the Plan is amended by deleting the definition “Final Average
Earnings” and by substituting the following:

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Supplementary Executive Retirement Plan
Amendment
Page 3 of 4
““Final Average Earnings”, in relation to an Executive, means:

  (a)   with respect to the calculation of a SERP I and SERP II benefit, the
average of the three (3) highest consecutive years of Earnings of the Executive
before the Executive’s Earnings Termination Date; and     (b)   with respect to
the calculation of a SERP III benefit, the average of the three (3) highest
consecutive years of Earnings of the Executive during the last ten (10) years of
the Executive’s employment with Nortel Networks before the Executive’s Earnings
Termination Date.”

5. Section 2 of the Plan is amended by adding to the definition “Percentage
Credit” the following paragraph:
“For greater certainty, no credit shall be attributed:

  (a)   in the case of a Temporarily Grandfathered Executive who does not become
a Grandfathered Executive, to any year or part year after the Executive returns
to active employment with the Corporation or an affiliate or subsidiary of the
Corporation;     (b)   in the case of an Executive who is neither a
Grandfathered Executive nor an Executive described in paragraph (a) of this
definition, to any year after 2007.”

6. Section 2 of the Plan is amended by changing the last sentence of the first
paragraph to read as follows and by adding to the definition “Retirement” and
“Retired”, the following subsection “(f)”:
“However, satisfaction of the conditions described in subsections (d), (e), and
(f) below shall not qualify an Executive for a SERP I Benefit:”
     “(f) the termination of employment is a “Termination Due to Change in
Control” as defined under the Nortel Networks Corporation Change in Control Plan
(the “CIC Plan”) as approved May 31, 2007, section 4.1(h) and the “Specified
Executive” (as defined under the CIC Plan) has attained fifty (50) years of age
on or before the “Termination Date” (as defined under the CIC Plan).”
7. Section 3 of the Plan is amended by deleting the first sentence of the second
paragraph and by substituting the following sentence:
“To qualify as an Executive, such an employee must also have been a participant
in the Traditional Option before 2008.”
8. Section 6.2 of the Plan is amended by deleting paragraphs (a) and (b) and by
substituting the following:

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Supplementary Executive Retirement Plan
Amendment
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  “(a)   Executives who transfer either to/from Canada/US will be given the
options available in the Capital Accumulation and Retirement Program in the new
country that are open to such Executive. If the Executive elects the Balanced
Option or the Investor Option before 2008 upon his or her transfer to the new
country, his or her participation in the SERP will be suspended during his or
her employment in the new country.     (b)   If the Executive returns to the
country of origin and if the Executive recommences participation in the
Traditional option in accordance with policy established in the country of
origin, the Executive will accrue SERP benefits with respect to the service
after the return to the country of origin. If the Executive elects the Balanced
or the Investor option before 2008 upon return to the country of origin in
accordance with the policy established in the country of origin, the Executive
would forfeit all SERP Benefits, even for service earned during the period
preceding the initial transfer.”

* * * * *
I hereby execute the foregoing amendment to the Plan, effective January 1, 2008,
for and on behalf of Nortel Networks Limited and in accordance with the
approvals granted pursuant to the governance mandates that are applicable to the
Plan.

                Signature:   /s/ Gordon A. Davies         Title: Gordon A.
Davies, General Counsel —
          Corporate and Corporate Secretary        Date: December 19, 2007     
 

                Signature:   /s/ T. Connelly McGilley         Title: Tracy S.J.
Connelly McGilley, Assistant
          Secretary        Date: December 20, 2007     

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CODE SECTION 409A AMENDMENT
TO THE
NORTEL NETWORKS SUPPLEMENTARY EXECUTIVE RETIREMENT PLAN
      WHEREAS, Nortel Networks Limited (the “Company”) sponsors the Nortel
Networks Supplementary Executive Retirement Plan (the “Plan”) and has reserved
the right to amend the Plan at any time; and
     WHEREAS, the Plan provides for the deferral of compensation within the
meaning of Section 409A of the Internal Revenue Code of 1986, as amended
(“Code”); and
      WHEREAS, the Company desires to amend the Plan to comply with Code
Section 409A and the regulations promulgated thereunder; and
      WHEREAS, the Retirement Plan Committee proposed this amendment and the
other committees responsible for review and approval of such an amendment have
granted such approvals in accordance with the governance mandates applicable to
the Plan;
      NOW, THEREFORE, the Plan is hereby amended, solely with respect to the
portion of any Plan benefit which accrues, ceases to be subject to a substantial
risk of forfeiture, or both, after 2004, provided such benefits are benefits not
excluded under the “foreign plan” exception of Code Section 409A, as follows;
and
      FURTHER, and officer of the Company is hereby authorized to execute the
amendment and perform such other acts as may be necessary to put the amendment
into effect and to approve any minor, non-material corrections to this
amendment; and
      FURTHER, the Retirement Plan Committee is authorized to review and adopt a
restatement of the Plan which incorporates these amendments:
1.
Effective January 1, 2005, and ending December 31, 2007, the existing provisions
of the Plan shall be administered in accordance with a good faith, reasonable
interpretation of Code Section 409A, including Treasury Department and
legislative guidance upon which good faith reliance is permitted for such
period. Effective December 31, 2007, the provisions of this Amendment shall
apply with respect to the provisions of the Plan affecting the time and method
of payment of Non-Grandfathered Benefits. Effective January 1, 2008, the
following provisions of this Amendment shall apply in their entirety with
respect to Non-Grandfathered Benefits.
2.
Section 2 of the Plan is amended by adding the following definitions for
purposes of applying the provisions of this Amendment:
“Grandfathered Benefit” shall mean the portion of the Total Retirement Benefit
representing the value of the vested accrued benefit under the Plan as of
December 31, 2004.
“Non-Grandfathered Benefit” shall mean the portion of the Total Retirement
Benefit representing the benefit of an Executive under the Plan which is either
accrued or ceases to be

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subject to a substantial risk of forfeiture after 2004, i.e., any Plan benefit
other than a Grandfathered Benefit. Only those benefits which are not exempt
under the foreign plan rules of Code Section 409A shall be deemed
Non-Grandfathered Benefits.
“Specified Executive” means a key employee (as defined in Section 416(i) of the
Code without regard to paragraph 5 thereof) of the Company.
“Termination of Employment” means the termination of the Executive’s employment
with the Company for reasons other than death. Whether a Termination of
Employment takes place is determined based on the facts and circumstances
surrounding the termination of the Executive’s employment and whether the
Company and the Executive intended for the Executive to provide significant
services for the Company following such termination. A change in the Executive’s
employment status will not be considered a Termination of Employment if:

  a.   the Executive continues to provide services as an employee of the Company
at an annual rate that is twenty percent (20%) or more of the services rendered,
on average, during the immediately preceding three full calendar years of
employment (or, if employed less than three years, such lesser period) and the
annual remuneration for such services is twenty percent (20%) or more of the
average annual remuneration earned during the final three full calendar years of
employment (or, if less, such lesser period), or     b.   the Executive
continues to provide services to the Company in a capacity other than as an
employee of the Company at an annual rate that is fifty percent (50%) or more of
the services rendered, on average, during the immediately preceding three full
calendar years of employment (or if employed less than three years, such lesser
period) and the annual remuneration for such services is fifty percent (50%) or
more of the average annual remuneration earned during the final three full
calendar years of employment (or if less, such lesser period).

For purposes of this Amendment the definition of “Termination of Employment”
shall apply to all uses of such term, whether capitalized or not.
3.
Section 8.1(b) of the Plan is amended to add the following language to the end
thereof:
“Notwithstanding the foregoing, any Non-Grandfathered Benefit payable hereunder
shall be paid in the form of a payment monthly for a period of fifteen
(15) years with the Spouse as the beneficiary (or in a lump sum payment if the
value of the benefit is $50,000 or less) following the Executive’s Retirement.
If there is no Spouse, the Executive may elect another individual to be the
beneficiary with respect to the remaining portion of the payment monthly for
fifteen (15) years.”
4.
Section 8.1(c) of the Plan is amended to add the following language to the end
thereof:

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“Notwithstanding the foregoing, any Non-Grandfathered Benefit payable hereunder
shall be paid in the form of a payment monthly for a period of fifteen
(15) years with the Spouse as the beneficiary (or in a lump sum payment if the
value of the benefit is $50,000 or less) following the Executive’s Retirement.
If there is no Spouse, the Executive may elect another individual to be the
beneficiary with respect to the remaining portion of the payment monthly for
fifteen (15) years.”
5.
Section 8 of the Plan is amended by adding, as a new section 8.4, the following:
           “8.4 Restriction on Timing of Distributions.
Notwithstanding any provision of this Plan to the contrary, if the Executive is
considered a Specified Employee at Retirement under such procedures as
established by the Company in accordance with Section 409A of the Code,
distributions of Non-Grandfathered Benefits that are made upon Retirement may
not commence earlier than six (6) months after the date of such Termination of
Employment. Therefore, in the event this Section 8.4 is applicable to the
Executive, any distribution of Non-Grandfathered Benefits which would otherwise
be paid to the Executive within the first six months following the Termination
of Employment shall be accumulated and paid to the Executive in a lump sum on
the first day of the seventh month following the Termination of Employment. All
subsequent distributions shall be paid in the manner specified.”
6.
Plan Section 11 “Amendment, Termination” is hereby amended to add the following
to the end thereof:
“Effective January 1, 2008, the Plan will only permit an acceleration of the
time and form of payment of Non-Grandfathered Benefits where the right to the
payment arises in accordance with the following:
(a) Within thirty (30) days before or twelve (12) months after a Change in
Control, as such is defined under Code Section 409A and the regulations
promulgated thereunder, provided that all distributions are made no later than
twelve (12) months following such termination of the Plan and further provided
that all the Company’s arrangements which are substantially similar to the Plan
are terminated so the Executive and all participants in the similar arrangements
are required to receive all amounts of compensation deferred under the
terminated arrangements within twelve (12) months of the termination of the
arrangements;
(b) Upon the Company’s dissolution or with the approval of a bankruptcy court
provided that the amounts deferred under the Plan are included in the
Executive’s gross income in the latest of (i) the calendar year in which the
Plan terminates; (ii) the calendar year in which the amount is no longer subject
to a substantial risk of forfeiture; or (iii) the first calendar year in which
the distribution is administratively practical; or

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(c) Upon the Company’s termination of this and all other arrangements that would
be aggregated with this Plan pursuant to Treasury Regulations
Section 1.409A-1(c) if the Executive participated in such arrangements (“Similar
Arrangements”), provided that (i) the termination and liquidation does not occur
proximate to a downturn in the financial health of the Company, (ii) all
termination distributions are made no earlier than twelve (12) months and no
later than twenty-four (24) months following such termination, and (iii) the
Company does not adopt any new arrangement that would be a Similar Arrangement
for a minimum of three (3) years following the date the Company takes all
necessary action to irrevocably terminate and liquidate the Agreement;
In the event of an occurrence described in (a), (b), or (c) above, the Company
may distribute a Non-Grandfathered Benefit to the Executive in a lump sum
subject to the above terms.”
7.
The provisions of this Plan which apply to Non-Grandfathered Benefits are
intended to be applied in a manner consistent with the requirements of Code
Section 409A, and will be construed accordingly. However, the Company shall bear
no responsibility for any determination by any other person or persons that the
arrangement or the administration thereof is subject to the tax provisions of
Code Section 409A.
      IN WITNESS WHEREOF, the undersigned duly authorized officer or delegate of
the Company has caused this Amendment to be adopted by affixing his or her
Signature hereto.

DATED the                      day of                                         ,
2007.

            NORTEL NETWORKS LIMITED
      By:   /s/ Gordon A. Davies         Title:   Gordon A. Davies, General
Counsel —
Corporate and Corporate Secretary     Date: December 19, 2007   

                  By:   /s/ T. Connelly McGilley       Title:   Tracy S.J.
Connelly McGilley,
Assistant  Secretary    Date:   December 20, 2007            

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