In depth analysis of Alcatel Lucent MDR-8000 microwave system engineering technology

3. Leading selectivity and interference suppression

Among all digital receivers, MDR-8000 adopts a fully digital filtering design except for the RF filter. Its adjacent channel threshold/interference index (such as -8 dB at a 10 MHz channel spacing) far exceeds traditional analog filtering schemes. This means that in spectrum congested urban areas or boundary regions where frequency coordination is difficult, the device can more effectively resist adjacent frequency interference, simplify the coordination process with FCC or NTIA, and shorten the link approval cycle.

Smooth Evolution of Business: Migration Strategy from TDM to IP/Ethernet

Faced with the trend of communication networks transitioning from traditional TDM to all IP, MDR-8000 provides a unique "soft migration" path, avoiding the high cost of large-scale equipment replacement.

1. Capacity key mechanism

This platform supports capacity upgrades from 2 DS1 to 3xDS3 or OC-3 without the need to replace core RF modules such as amplifiers and transceivers. By simply changing the Capacity Keys (software authorization), the capacity can be increased while the hot backup system is online without interrupting business. This is of great significance for critical infrastructure links that cannot easily apply for downtime windows.

2. Hybrid coexistence of TDM and Ethernet

The Ethernet interface board of MDR-8000 supports 10/100/1000 Base-T. Of particular note is its dynamic bandwidth adjustment capability: on the same RF carrier, users can simultaneously carry TDM (DS1) and Ethernet traffic.

Progressive cutover: Initially, a small number of DS1s can be configured to ensure traditional voice or SCADA services, while allocating the remaining bandwidth to Ethernet. With the retirement of old devices, network administrators can activate individual DS1 time slots online, and this portion of bandwidth will be automatically released and included in the Ethernet bandwidth pool.

Working mode selection: For Ethernet transmission, the platform provides A Only (non backup/hot backup), A&B Switched (port+link dual protection), A&B Summed (link aggregation to increase bandwidth), A&B Separate (dual channel independent bearer), and Dual Channel fault fallback mode. In Summed Dual Channel mode, when one RF channel fails, the traffic will be automatically aggregated to another working channel, achieving smooth degradation of throughput (such as from 300 Mb/s to 150 Mb/s), rather than complete interruption of traffic.

Network management and remote operation and maintenance mechanism

For widely distributed microwave networks, efficient management methods are the core of reducing operation and maintenance costs.

1. Compatible with multiple network management protocols

MDR-8000 not only supports traditional MCS-11 and E2A/TBOS serial monitoring protocols, but also SNMP (V1/V2/V3), making it easy to access modern telecommunications management networks. The SNMP MIB library provides complete read-write capabilities for alarms, status, performance parameters, and configurations.

2. ELMC Extended Link Monitoring Channel

As a standard feature, ELMC allows local maintenance personnel to remotely view the configuration and alarm information of any adjacent node in the network through the USI graphical interface, and even supports remote software download and configuration. This greatly reduces the frequency of on-site troubleshooting, especially in harsh weather or remote mountainous sites, reducing the number of engineer trips.

3. ATPC adaptive transmission power control

The ATPC function dynamically adjusts the remote transmission power based on the signal level at the receiving end through precise dB for dB adjustment. Unlike ordinary switch mode ATPC (which directly increases to full power after triggering the threshold), the linear adjustment mechanism of MDR-8000 avoids unnecessary full power output, strictly meets FCC's regulations on full power operation time (not exceeding 52 minutes per year) in ATPC mode, and reduces the aging rate of equipment during long-term operation.

High reliability hardware design and environmental deployment

Passive heat dissipation and low power consumption: The thermal design of MDR-8000 mainly relies on the rear passive heat sink, and the high heating module is directly coupled to the heat sink and supplemented by a self checking thermal sensor. In addition to high-power configuration, the hot backup machine does not require a fan, which not only reduces the risk of failure points (fan failure), but also reduces the load on the computer room air conditioning. Its power consumption is about one-third lower than similar products, directly reducing the investment in front-end DC power supply and backup battery pack.

Compact and all indoor deployment: The all indoor installation design (including standard and compact 4RU chassis) avoids the risks of outdoor unit moisture, lightning strikes, and temperature shocks. Compact chassis even support pole or wall mounted installation, without the need to build a dedicated computer room. For low-density links or ring network terminal nodes that do not require hot backup, this solution greatly reduces the difficulty of site acquisition.