The ratings of 3 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”).

This is a rough week for Palo Alto Networks, Inc. (PANW). The company’s rating falls to D from the previous week’s C. Palo Alto Networks, Inc. offers a next-generation network security platform that allows enterprises, service providers, and government entities to secure their networks. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of PANW stock.

Juniper Networks, Inc. (JNPR) gets weaker ratings this week as last week’s C drops to a D. Juniper Networks, Inc. provides Internet infrastructure solutions for Internet service providers and other telecommunications service providers. For more information, get Portfolio Grader’s complete analysis of JNPR stock.

Bel Fuse Inc. Class B (BELFB) slips from a C to a D this week. Bel Fuse Inc. Class B designs, manufactures, and sells products used in networking, telecommunications, high-speed data transmission, and consumer electronics. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of BELFB 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.