Telecom Equipment Providers Fall After Adtran Cuts Guidance By: TalkMarkets December 29, 2017 at 13:56 PM EST Telecommunications equipment companies are falling after Adtran issued guidance for its fourth and first quarters. Read More >> Related Stocks: Adtran Holdings Inc Arris Group Inc Calix Inc CenturyLink Ciena Corp Cisco Systems Clearfield Inc Fujitsu Ltd ADR Hewlett Packard Enterprise Comp Hive Digital Technologies Ltd Nokia Corp ADR Zte Corp