Tollgrade Communications (TLGD) 8-K Changes in Registrant's Certifying Accountant

Exhibit 16.1

PricewaterhouseCoopers LLP

600 Grant Street

Pittsburgh PA 15219

Telephone (412) 355 6000

Facsimile (412) 355 8089

March 15, 2010

Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549

Commissioners:
We have read the statements made by Tollgrade Communications, Inc. (copy attached), which we understand will be filed with the Securities and Exchange Commission, pursuant to Item 4.01 of Form 8-K, as part of the Form 8-K of Tollgrade Communications, Inc. dated March 11, 2010. We agree with the statements concerning our Firm in such Form 8-K.

Very truly yours,