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

Radware’s (RDWR) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Radware develops, manufactures and markets application delivery and network security solutions that provide end-to-end availability, performance and security of mission critical networked applications. In Portfolio Grader’s specific subcategory of Earnings Growth, RDWR also gets an F. The trailing PE Ratio for the stock is 43.80. To get an in-depth look at RDWR, get Portfolio Grader’s complete analysis of RDWR stock.

EchoStar Corporation Class A (SATS) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. EchoStar engages in the design, development, and distribution of digital set-top boxes and related products. The stock gets F’s in Earnings Growth, Earnings Momentum and Margin Growth. The stock currently has a trailing PE Ratio of 42.80. For more information, get Portfolio Grader’s complete analysis of SATS stock.

Dragonwave Inc. (DRWI) is having a tough week. The company’s rating falls from a C to a D. DragonWave is a producer of high-capacity packet microwave solutions which support networking and other data transmission needs. The stock gets F’s in Equity and Cash Flow. To get an in-depth look at DRWI, 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.