The overall ratings of four Diversified Telecommunication Services stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Cbeyond (NASDAQ:CBEY) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Cbeyond provides managed IT-based communications services to small businesses in metropolitan areas across the United States. For Portfolio Grader’s specific subcategory of Equity, CBEY also gets an F. For more information, get Portfolio Grader’s complete analysis of CBEY stock.

Windstream (NASDAQ:WIN) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). Windstream is a company that provides communications and technology solutions, including high-speed Internet access, digital television services, and voice services. The stock also rates an F in Margin Growth. The stock price has fallen 2.6% over the past month, worse than the 3.7% increase the Nasdaq has seen over the same period of time. The stock has a trailing PE Ratio of 25.8. To get an in-depth look at WIN, get Portfolio Grader’s complete analysis of WIN stock.

Slipping from a C to a D rating, Tata Communications

(NYSE:TCL) takes a hit this week. Tata Communications provides international telephone, telex and telegraphy services, international maritime mobile communications, INTELSAT business service and bureau fax and t-fax services. The stock price has fallen 4.8% over the past month. For a full analysis of TCL stock, visit Portfolio Grader.

FairPoint Communications (NASDAQ:FRP) earns a D this week, falling from last week’s grade of C. FairPoint Communications provides communications services to residential and business customers. The stock receives F’s in Earnings Growth, Earnings Momentum, Cash Flow, and Margin Growth. As of August 15, 19.4% of outstanding FairPoint Communications shares were held short. For more information, get Portfolio Grader’s complete analysis of FRP stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.