CommScope Andrew 7566564-00 OTRx 8-9/18/21 MU-G Rev. 01 Optical Transceiver

The CommScope Andrew 7566564-00 (Rev. 01) OTRx 8-9/18/21 MU-G is an optical transceiver module designed for the ION-M Master Unit (MU) in CommScope’s Intelligent Optical Network radio-over-fiber (RoF) distributed antenna systems (DAS). It functions as the primary interface between the RF signals from base stations or combiners and the optical transport layer, performing downlink RF-to-optical conversion and uplink optical-to-RF conversion for multi-band operation.This module supports three frequency bands: 800 MHz (Band 8), 900 MHz (Band 9), and the combined 1800/2100 MHz range (Bands 18/21). It is optimized for transporting 2G GSM, 3G UMTS, 4G LTE and related technologies in multi-operator or neutral-host DAS deployments. The OTRx incorporates Wavelength Division Multiplexing (WDM) technology with a downlink wavelength of 1310 nm (±20 nm) and an uplink wavelength in the 1540–1562 nm range, enabling bidirectional communication over a single single-mode optical fiber (E9/125 µm) to compatible ION-M Remote Units (RUs). The optical link budget is typically 0 to 10–12 dBo, depending on system configuration and fiber attenuation.
The module features multiple RF ports, commonly implemented with QMA connectors for separate uplink and downlink paths per band group. It includes an E2000/APC optical connector for low-loss, high-return-loss fiber connection (minimum 45 dB optical return loss). An integrated control channel supports communication with remote units for automatic level control (ALC), gain levelling, monitoring, and alarm forwarding. The transceiver connects directly to the ION-M subrack backplane for power (typically 12 VDC or system bus) and system management.
Electrically, the OTRx is engineered for low noise figure, high linearity, and low intermodulation to preserve signal quality across the supported bands. It accepts composite input power levels typical for DAS head-ends (commonly up to +5 dBm per band group) and provides additional downlink gain settings (range 0–22 dB in similar OTRx modules) with automatic levelling to compensate for optical link variations. The passive optical components combined with active conversion circuitry ensure stable performance in continuous operation.
Mechanically, the 7566564-00 is a plug-in drawer or card-style module compatible with ION-M MMR (Multi-Mode Radio) subracks and chassis. It installs into designated OTRx slots within the Master Unit, supporting star, daisy-chain, or cascaded fiber topologies with up to four remote units per OTRx in standard configurations. The design integrates with the ION-M system controller for centralized management via A.I.M.O.S., SNMP, or relay alarms, enabling remote supervision, performance diagnostics, and fault isolation.
This optical transceiver is widely used in in-building and outdoor DAS installations for venues such as office complexes, airports, stadiums, campuses, tunnels, and high-rise buildings where efficient multi-band signal distribution over fiber is required. It reduces cabling complexity by aggregating RF signals from multiple sources (often after passing through band-specific combiners such as the 7160614, 7160615, or 7161269-00) into a single-fiber optical link while maintaining high port-to-port isolation and low passive intermodulation (PIM).
Installation follows CommScope ION-M guidelines, including proper RF port assignment per band, fiber cleaning and inspection, connector torque specifications, and system auto-levelling during commissioning. Maintenance is performed at the field-replaceable unit (FRU) level, with periodic checks of optical power levels, RF interfaces, and alarm status recommended. The module is backward-compatible within legacy ION-M systems and supports network expansions or technology migrations without full head-end replacement.
The OTRx 8-9/18/21 MU-G belongs to the family of intelligent optical transceivers in the ION-M platform, providing scalable, reliable transport for multi-band cellular coverage in modern wireless infrastructure.