This week, the overall grades of 3 Communications Equipment stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

ADTRAN, Inc. (ADTN) declines this week from a D to a F. ADTRAN, Inc. designs, manufactures, markets and services network access solutions for communications networks for providers of communications services and small- and mid-sized businesses. The company also gets F’s in earnings growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of ADTN stock.

This is a rough week for Finisar Corporation (FNSR). The company’s rating falls to F from the previous week’s D. Finisar Corporation provides fiber optic subsystems and network performance test systems which enable high-speed data communications over local area network and storage area networks. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of FNSR stock.

Mitel Networks Corporation (MITL) is having a tough week. The company’s rating falls from a C to a D. Mitel Networks Corporation is a provider of communications solutions for organizations. The company also gets F’s in earnings growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of MITL 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.