For the current week, the overall ratings of three communications equipment stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Dragonwave Inc.’s (DRWI) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. DragonWave is a producer of high-capacity packet microwave solutions which support networking and other data transmission needs. In Portfolio Grader’s specific subcategories of Equity and Cash Flow, DRWI also gets F’s. To get an in-depth look at DRWI, get Portfolio Grader’s complete analysis of DRWI stock.

The rating of Juniper Networks, Inc. (JNPR) declines this week from a C to a D. Juniper Networks provides Internet infrastructure solutions for Internet service providers and other telecommunications service providers. The stock also gets an F in Sales Growth. For more information, get Portfolio Grader’s complete analysis of JNPR stock.

Silicom Ltd. (SILC) gets weaker ratings this week as last week’s C drops to a D. Silicom designs, manufactures, markets, and supports Multi-Port Gigabit-Ethernet Server Adapters. The stock gets F’s in Earnings Momentum and Sales Growth. To get an in-depth look at SILC, get Portfolio Grader’s complete analysis of SILC 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.