Contract analysis

1. Purpose and Scope of Engagement Calderwood & Harkness LLP ("C&H" or the "Firm") is pleased to confirm that Northgate Telecommunications PLC ("Northgate," "NTP," or the "Company") has engaged the Firm to serve as its primary outside legal counsel in connection with the proposed acquisition (the "Transaction") of Cascadia Fiber Networks, Inc. ("Cascadia" or "CFN"), a corporation organized under the laws of the State

2. Staffing The following attorneys have been assigned to serve as the primary legal team for this engagement: Oliver Mackenzie will serve as the Responsible Partner for the engagement and will be the principal point of contact for the Company on all matters relating to the Transaction. Mr. Mackenzie will have overall supervisory responsibility for all workstreams described in Section 1.1 above, and will be directly

3. Fee Arrangements 3.1 Hourly Rates The Firm will bill the Company for legal services rendered in connection with this engagement on a time-incurred basis at the following current standard hourly rates, which apply to the attorneys and professional staff assigned to this engagement as of the date of this Letter: • Partners: $1,650 – $1,950 per hour • Senior Associates / Counsel: $1,100 – $1,450 per hour • Associates

4. Identification of the Client The Firm's client in this engagement is Northgate Telecommunications PLC. This engagement does not create an attorney-client relationship between the Firm and any officer, director, stockholder, employee, or affiliate of Northgate, in their individual or personal capacity. Without limiting the generality of the foregoing, the Firm does not separately represent NTP Acquisition Sub, Inc.

5. Conflicts of Interest and Waiver 5.1 Conflicts Clearance The Firm has conducted a comprehensive conflicts check in connection with this engagement, covering all parties and entities identified in connection with the Transaction. Subject to the matter described in Section 5.2 below, the Firm has confirmed that no impermissible conflicts of interest exist under the New York Rules of Professional Conduct or any other

6. Confidentiality and Privilege The Firm will maintain the confidentiality of all information received from the Company in connection with this engagement, in accordance with applicable Rules of Professional Conduct and the Firm's internal confidentiality policies and procedures. The Firm will not disclose such information to any third party without the Company's prior consent, except as required by law or court ord

7. Document Retention The Firm will maintain files and records (whether in paper or electronic form) relating to this engagement in accordance with the Firm's document retention policies, as may be amended from time to time. Upon the conclusion of the engagement, the Firm will retain client files and records for the period specified in the Firm's then-current document retention policies, which currently provide for a

8. Termination of Engagement Either the Company or the Firm may terminate this engagement at any time by providing written notice to the other party. Any termination by the Firm will be subject to the Firm's obligations under applicable Rules of Professional Conduct, including the obligation to provide reasonable notice and to avoid material prejudice to the Company. In the event of any termination, the Firm will tak

9. Governing Law This Letter, and the engagement described herein, shall be governed by and construed in accordance with the laws of the State of New York, without giving effect to any choice-of-law or conflicts-of-law rules or principles that would cause the application of the laws of any jurisdiction other than the State of New York. Any dispute arising out of or relating to this Letter or the Firm's engagement her

10. Counterparty Identification For the Company's reference, the principal parties and advisors to the Transaction, as currently identified by the Firm based on information provided by the Company and its advisors, are set forth below. This summary is provided for informational and coordination purposes and does not constitute a representation by the Firm as to the completeness or accuracy of the information set fort

11. Acceptance and Agreement If the foregoing terms and conditions are acceptable to the Company, please indicate Northgate's acceptance of this engagement by executing this Letter in the space provided below and returning a signed copy to the undersigned. An electronic copy sent by email to oliver.mackenzie@calderwoodharkness.com is sufficient for these purposes, with an original to follow by courier. This engagemen