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Communication Components, Inc. Single Tower-Top Masthead Amplifier (TMA) provides a TMA with SMR channel filtering and AISG control in a single housing. The TMA is full 850MHz band and fully duplexed. High linearity improves the uplink sensitivity and the receive performance of base stations. The TMA is fully compliant with the latest AISG 2.0 specification, backward compatible with DC PDU’s and supports CDMA, EDGE/GSM and UMTS BTS equipment. It provides a convenient package to improve site Noise figure. The single TMA package reduces tower loading, leasing, and installation costs. Unit count on the tower is cut in half. SMR filtering is built into the unit to protect against adjacent SMR signals.
Technical Description:
The TMA system consists of an outdoor tower mount unit with integrated AISG sampling from the feeder line. The tower mount unit is dual duplexed to separate the low-power uplink signal from the high-power downlink signal at the antenna port, amplifies the low-level uplink signal using an ultra-low noise amplifier (LNA), and recombines the two paths at the BTS port. The tower mount units consist of three band-pass filters, two redundant low-noise amplifiers, bypass failure circuitry, and bias tee which are all housed in an IP65 moisture proof enclosure, with IP68 Immersion proof connectors suited to long-life masthead mounting. The unit provides protection against lightning strikes via a multi-stage surge protection circuit. DC power and control is provided via the feeder cable from the BTS using the AISG 2.0 and 3GPP standard. A separate AISG connector is also provided to allow direct AISG connection or “Daisy Chaining” multiple AISG products at the top of the tower. An optional indoor site control unit (SCU) is available to power up to 32 AISG modules per sector and to provide all the monitoring and alarm functions for the system. The SCU is housed in a single (1U) 1.75” x 19” rack and contains dual redundant power supplies capable of being “hot swapped” that provide a regulated DC supply voltage on the RF coax for the tower mount amplifiers.
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