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

JDS Uniphase’s (NASDAQ:JDSU) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. 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. In Portfolio Grader’s specific subcategories of Earnings Revisions, Equity, and Margin Growth, JDSU also gets an F. For more information, get Portfolio Grader’s complete analysis of JDSU stock.

Acme Packet (NASDAQ:APKT) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). Acme Packet offers session border controllers that allow service providers to deliver secure interactive communications across IP network borders. The stock gets F’s in Earnings Growth, Earnings Momentum, and Margin Growth. As of Jan. 24, 2013, 11.9% of outstanding Acme Packet shares were held short. The trailing PE Ratio for the stock is 90.40. To get an in-depth look at APKT, get Portfolio Grader’s complete analysis of APKT stock.

This week, Aruba Networks (NASDAQ:ARUN) drops from C to a D rating. 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 Margin Growth. As of Jan. 24, 2013, 18.8% of outstanding Aruba Networks shares were held short. For a full analysis of ARUN stock, visit Portfolio Grader.

F5 Networks (NASDAQ:FFIV) earns an F this week, moving down from last week’s grade of D. F5 Networks provides integrated Internet traffic management solutions designed to improve the availability and performance of mission-critical Internet-based servers and applications. The stock also rates an F in Earnings Surprise. The stock’s trailing PE Ratio is 28.00. To get an in-depth look at FFIV, get Portfolio Grader’s complete analysis of FFIV 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.