Excerpt: Confused about DB9, DB15, and circular M16 AISG RET cables for telecom antennas? This guide explains their core differences, signal functions, application scenarios, and exact compatibility with Huawei, ZTE, Ericsson, and Nokia RRU devices for 4G and 5G base stations. In 4G and 5G telecom base station construction, RET (Remote Electrical Tilt) cables serve as the critical link to …