The overall ratings of 6 Communications Equipment stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, CalAmp Corp. (CAMP) drops from a D to a F rating. CalAmp Corp. develops and markets wireless communications solutions that deliver data, voice, and video for critical networked communications and other applications primarily in the United States. 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 CAMP stock.

Sierra Wireless Inc. (SWIR) gets weaker ratings this week as last week’s D drops to a F. Sierra Wireless Inc. provides edge wireless solutions for the mobile computing and machine-to-machine markets. The company also gets F’s in earnings growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of SWIR stock.

This week, Digi International Inc.’s (DGII) rating worsens to a D from the company’s C rating a week ago. Digi International Inc. develops products and technologies to connect and manage local or remote electronic devices over a network, via the Internet or via satellite. For more information, get Portfolio Grader’s complete analysis of DGII stock.

ShoreTel, Inc. (SHOR) declines this week from a C to a D. ShoreTel, Inc. is a provider of Internet Protocol, or IP, unified communications systems for enterprises. The company also gets F’s in earnings growth. For more information, get Portfolio Grader’s complete analysis of SHOR stock.

This is a rough week for Mitel Networks Corporation (MITL). The company’s rating falls to D from the previous week’s C. Mitel Networks Corporation is a provider of communications solutions for organizations. For more information, get Portfolio Grader’s complete analysis of MITL stock.

Aerohive Networks, Inc.’s (HIVE) rating weakens this week, dropping to a D versus last week’s C. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of HIVE 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.