For the current week, the overall ratings of six Diversified Telecommunication Services stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Consolidated Communications’ (NASDAQ:CNSL) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Consolidated Communications operates as a rural local exchange company that provides communications services to residential and business customers in Illinois, Texas, and Pennsylvania. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Earnings Revisions, and Margin Growth, CNSL also gets F’s. The trailing PE Ratio for the stock is 41.10. For a full analysis of CNSL stock, visit Portfolio Grader.

Telefonica Brasil (NYSE:VIV) experiences a ratings drop this week, going from last week’s C to a D. Telefonica Brasil is a telecommunications company which provides services for fixed and mobile telephony, data transmission and VAS, pay TV, among others. To get an in-depth look at VIV, get Portfolio Grader’s complete analysis of VIV stock.

This week, Oi’s (NYSE:OIBR) rating worsens to a D from the company’s C rating a week ago. Oi provides integrated telecommunication service for residential customers, companies, and governmental agencies in Brazil. The stock also rates an F in Margin Growth. The stock price has dropped 6.2% over the past month, worse than the 3% increase the S&P 500 has seen over the same period of time. For a full analysis of OIBR stock, visit Portfolio Grader.

Level 3 Communications (NYSE:LVLT) is having a tough week. The company’s rating falls from C to a D. Level 3 is an integrated communications network company that provides Internet Protocol and data services, content distribution services, colocation services, and softswitch and voice services. The stock receives F’s in Earnings Momentum, Earnings Revisions, Equity, and Cash Flow. Wall Street appears to agree with the stock downgrade, with share prices dropping 13.9% over the past month. For more information, get Portfolio Grader’s complete analysis of LVLT stock.

Windstream’s (NASDAQ:WIN) rating falls this week to an F (“strong sell”), down from last week’s 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 gets an F in Margin Growth. Share prices fell 8.7% over the past month. As of Feb. 20, 2013, 10.9% of outstanding Windstream shares were held short. The stock’s trailing PE Ratio is 40.60. To get an in-depth look at WIN, get Portfolio Grader’s complete analysis of WIN stock.

This is a rough week for Portugal Telecom (NYSE:PT). The company’s rating falls to D from the previous week’s C. Portugal Telecom S.A. offers domestic, long distance, and international telephone, mobile telephone, paging, Internet access, and data communications services. The stock gets F’s in Earnings Surprise, Cash Flow, and Margin Growth. For a full analysis of PT stock, visit Portfolio Grader.

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.