Exhibit 12.1

CALCULATION OF RATIOS OF EARNINGS TO FIXED CHARGES

PAETEC Holdings ratios of
earnings to fixed charges were as follows:



|                                                                |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|--------------------------------------------------------------- |  | ---- | ------ |  | ---- | - | ------ | ---- |  | - | -------- | - |  | ---- | ------- | - |  | - | ------- | -
|                                                                |  | 2006 |        |  | 2007 |   |        | 2008 |  |   | 2009     |   |  | 2010 |        
|Earnings:                                                       |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|Income (loss) before income taxes                               |  | $    | 16,233 |  |      | $ | 18,565 |      |  | $ | (398,098 | ) |  | $    | (30,043 | ) |  | $ | (58,745 | )
|Plus: Fixed Charges (see below)                                 |  |      | 28,206 |  |      |   | 69,932 |      |  |   | 76,673   |   |  |      | 77,465  |   |  |   | 99,787  |  
|                                                                |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|Total Earnings                                                  |  | $    | 44,439 |  |      | $ | 88,497 |      |  | $ | (321,425 | ) |  | $    | 47,422  |   |  | $ | 41,042  |  
|                                                                |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|                                                                |  |      |        |  |     
|Fixed Charges:                                                  |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|Interest expense, including amortization of debt issuance costs |  |      | 27,319 |  |      |   | 68,373 |      |  |   | 73,663   |   |  |      | 74,149  |   |  |   | 96,339  |  
|Portion of rental expense deemed to represent interest          |  |      | 887    |  |      |   | 1,559  |      |  |   | 3,010    |   |  |      | 3,316   |   |  |   | 3,448   |  
|                                                                |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|Total Fixed Charges                                             |  |      | 28,206 |  |      |   | 69,932 |      |  |   | 76,673   |   |  |      | 77,465  |   |  |   | 99,787  |  
|                                                                |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|Ratio of earnings to fixed charges                              |  |      | 1.58   |  |      |   | 1.27   |      |  |   | *        |   |  |      | *       |   |  |   | *       |  
|                                                                |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  
|Coverage deficiency                                             |  | $    |       |  |      | $ |       |      |  | $ | (398,098 | ) |  | $    | (30,043 | ) |  | $ | (58,745 | )
|                                                                |  |      |        |  |      |   |        |      |  |   |          |   |  |      |         |   |  |   |         |  



|* | There were insufficient earnings available to cover fixed charges for the years ended December 31, 2008, 2009 and 2010. As a result, the ratio of earnings to fixed
charges was less than 1.0 for each of such periods.
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