Andrew achieved an average signal level performance of -90 dB along the length of the installation with our radiating cable and three types of bidirectional amplifiers. Air interface amplifiers in the shorter tunnels assisted with handover of calls to the outside. Direct signal inserts taken from cell sites and base stations were injected into longer tunnel solutions. Distribution amplifiers in some sections overcame cable attenuation to maintain strong signals throughout the system. The MTRC was the first metro in the world to offer total, system-wide coverage to commercial providers and share in the revenue.
Equal access is provided to all service providers.
Phase I of the project refurbished and upgraded the existing paging service and expanded it across the entire system. During Phase II, commercial service was brought to the over 2 million daily MTRC passengers. Andrew provided fully redundant wireless emergency communications services throughout the system. The most recent phase extends GSM coverage into the entire system. An Andrew employee tests an Andrew Heterodyne amplifier.