Exhibit 12.1

CALCULATION OF RATIOS OF EARNINGS TO FIXED CHARGES

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



|                                                                |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|--------------------------------------------------------------- |  | ----------------------- | ------ | ---- | - | -------------- |  | ---- | ------ |  | ---- | -------- | - |  | - | ------- | -
|                                                                |  | Year Ended December 31, |       
|                                                                |  | 2005                    |        | 2006 |   | 2007           |  | 2008 |        |  | 2009 |         
|                                                                |  |                         |        |      |   | (in thousands) |  |      |        |  |      |         
|Earnings:                                                       |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|                                                                |  |                         |        |      |  
|Income (loss) before income taxes                               |  | $                       | 28,598 |      | $ | 16,233         |  | $    | 18,565 |  | $    | (398,098 | ) |  | $ | (30,043 | )
|                                                                |  |                         |        |      |  
|Plus: Fixed Charges (see below)                                 |  |                         | 11,374 |      |   | 28,206         |  |      | 69,932 |  |      | 76,673   |   |  |   | 77,465  |  
|                                                                |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|Total Earnings                                                  |  | $                       | 39,972 |      | $ | 44,439         |  | $    | 88,497 |  | $    | (321,425 | ) |  | $ | 47,422  |  
|                                                                |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|Fixed Charges:                                                  |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|                                                                |  |                         |        |      |  
|Interest expense, including amortization of debt issuance costs |  | $                       | 10,472 |      | $ | 27,319         |  | $    | 68,373 |  | $    | 73,663   |   |  | $ | 74,149  |  
|                                                                |  |                         |        |      |  
|Portion of rental expense deemed to represent interest          |  |                         | 902    |      |   | 887            |  |      | 1,559  |  |      | 3,010    |   |  |   | 3,316   |  
|                                                                |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|Total Fixed Charges                                             |  | $                       | 11,374 |      | $ | 28,206         |  | $    | 69,932 |  | $    | 76,673   |   |  | $ | 77,465  |  
|                                                                |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|                                                                |  |                         |        |      |  
|Ratio of earnings to fixed charges                              |  |                         | 3.51   |      |   | 1.58           |  |      | 1.27   |  |      | *        |   |  |   | *       |  
|                                                                |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  
|Coverage deficiency                                             |  | $                       |       |      | $ |               |  | $    |       |  | $    | (398,098 | ) |  | $ | (30,043 | )
|                                                                |  |                         |        |      |   |                |  |      |        |  |      |          |   |  |   |         |  



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