The ratings of four Communications Equipment stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Sycamore Networks (NASDAQ:SCMR) earns a F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). Sycamore Networks develops and markets Intelligent Bandwidth Management solutions for fixed line and mobile network operators worldwide and provides services associated with such products. In Portfolio Grader’s specific subcategory of Equity, SCMR also gets an F. For a full analysis of SCMR stock, visit Portfolio Grader.

This week, Aruba Networks (NASDAQ:ARUN) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Aruba Networks is engaged in distributed enterprise networks that securely connect local and remote users to corporate IT resources. The stock also gets an F in Earnings Momentum. As of Sept. 27, 2012, 20.2% of outstanding Aruba Networks shares were held short. To get an in-depth look at ARUN, get Portfolio Grader’s complete analysis of ARUN stock.

JDS Uniphase (NASDAQ:JDSU) is having a tough week. The company’s rating falls from a D to a F rating. JDS Uniphase is a provider of communications test and measurement solutionsand optical products for telecommunications service providers, wireless operators, cable operators, and network-equipment manufacturers. The stock gets F’s in Earnings Growth, Equity, and Margin Growth. For a full analysis of JDSU stock, visit Portfolio Grader.

Westell Technologies‘s (NASDAQ:WSTL) rating weakens this week, dropping to a F versus last week’s D. Westell Technologies designs, manufactures, and distributes telecommunications products to telephone companies and other telecommunications service providers. The stock receives F’s in Earnings Growth, Earnings Momentum, and Earnings Revisions. Margin Growth and Sales Growth also get F’s. Compared to a month ago, shares of the company have remained flat. This is worse than the Nasdaq’s 0.8% increase over the same period. For more information, get Portfolio Grader’s complete analysis of WSTL 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.