This week, the overall grades of 5 Communications Equipment stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

F5 Networks, Inc. (FFIV) experiences a ratings drop this week, going from last week’s C to a D. F5 Networks, Inc. provides integrated Internet traffic management solutions designed to improve the availability and performance of mission-critical Internet-based servers and applications. For more information, get Portfolio Grader’s complete analysis of FFIV stock.

This week, Plantronics, Inc.’s (PLT) rating worsens to a D from the company’s C rating a week ago. Plantronics, Inc. designs, manufactures, and markets lightweight communications headsets and headset accessories and services. For more information, get Portfolio Grader’s complete analysis of PLT stock.

Ruckus Wireless, Inc.’s (RKUS) rating weakens this week, dropping to a D versus last week’s C. For more information, get Portfolio Grader’s complete analysis of RKUS stock.

Slipping from a D to a F rating, PCTEL, Inc. (PCTI) takes a hit this week. PCTEL, Inc. develops and supplies software-based connectivity solutions. The company also gets F’s in operating margin growth, earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PCTI stock.

Dragonwave Inc. (DRWI) is having a tough week. The company’s rating falls from a D to a F. Dragonwave Inc. is a producer of high-capacity packet microwave solutions which support networking and other data transmission needs. The company also gets F’s in sales growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of DRWI 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.