The overall ratings of three communications equipment stocks are down on Portfolio Grader this week. 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. Shares of the stock have been changing hands at an unusually rapid pace, four times the rate of the week prior. The stock’s trailing PE Ratio is 52.10. 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 77.80. For more information, get Portfolio Grader’s complete analysis of SATS stock.

This is a rough week for Dragonwave Inc. (DRWI). The company’s rating falls to D from the previous week’s C. 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.