Question 1

What are the core optical/electrical performance, modulation formats, and dispersion tolerance specifications of the Huawei TN56NS3 board?

Accepted Answer

The Huawei TN56NS3 (SKU: HW-OSN-TN56NS3-LINE) is a high-performance coherent optical line processing board engineered for 40G/100G OTN backbone networks. It provides 1-port 100G OTU4 or 40G OTU3 line interface operating over the full C-band (tunable across 96 channels at 50 GHz spacing or 48 channels at 100 GHz spacing). It implements ePDM-QPSK for standard 100G scenarios and ePDM-BPSK for ultra-long-haul links, integrated with 2nd-generation Soft-Decision Forward Error Correction (SDFEC, ~20% overhead) delivering >11.5 dB Net Coding Gain (NCG). The coherent DSP enables non-dispersion-compensated transmission with a chromatic dispersion (CD) tolerance of ±45,000 to ±55,000 ps/nm and differential group delay (PMD) tolerance of 25–30 ps, while maintaining a low typical power consumption under 95 W.

Question 2

What are the slot compatibility and cross-connect fabric scheduling rules for the Huawei TN56NS3 inside OptiX OSN 6800 and OSN 8800 chassis?

Accepted Answer

The TN56NS3 board is fully compatible with Huawei OptiX OSN 8800 (T16, T32, T64) and enhanced OSN 6800 subracks. In the OSN 8800 platform, it occupies standard service slots and interfaces with centralized cross-connect units (e.g., UXCL/XCS) via high-speed backplane serial buses. It flexibly receives, cross-connects, and maps ODU0, ODU1, ODU2, ODU2e, ODU3, and ODU4 sub-rate services from tributary boards (such as 10x10G TOM or 100G TTX) into a single 100G OTU4 stream. The board supports hybrid in-chassis deployment alongside legacy 10G/40G non-coherent transponders. It features hot-swap inrush current limiting and high-impedance power isolation to eliminate voltage dips on the shared backplane.

Question 3

How are the thermal management, temperature tolerances, and operational reliability engineered on the TN56NS3 for dense telecom installations?

Accepted Answer

The TN56NS3 is compliant with ETSI rack integration and NEBS Level 3 carrier-grade standards. It has a rated operating temperature from 0°C to +45°C (short-term tolerance from -5°C to +55°C) and handles 5% to 95% non-condensing relative humidity. To dissipate thermal loads from the coherent DSP and integrated optoelectronic module, the board utilizes custom vapor-chamber heat pipes coupled with aerodynamic air baffles for front-to-top/bottom-to-top chassis forced cooling. Multi-point thermal sensors provide telemetry on DSP junction and optical laser bench temperatures, dynamically feeding into chassis fan modulation and escalating alarm hierarchies. The board yields an MTBF rating exceeding 450,000 hours under continuous 24/7 backbone load.

Key specifications	Value
Board Type	40G/100G high-capacity coherent optical transmission line processing service board
Port Density & Specs	1-channel 100G OTU4 / 40G OTU3 coherent optical line interface
Supported Chassis	Huawei OptiX OSN 6800 / 8800 series high-capacity wavelength-division multiplexing chassis
Subscriber Capacity	Supports ePDM-QPSK / ePDM-BPSK coherent modulation and ultra-long-distance transmission without powered repeaters
Typical Power Consumption	< 95 W
Operating Temperature	0°C ~ +45°C (telecommunications equipment room operating conditions)

Huawei OptiX OSN TN56NS3 40G/100G Coherent Optical Line Board (For OSN 6800/8800)

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

National and provincial backbone DWDM networks

Hyperscale datacenter interconnect (DCI) trunks

Metropolitan core optical aggregation rings

Frequently asked questions

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