Whether DCMs need to be configured in a 100G coherent system

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No. OTU boards uniformly compensate for accumulated fiber dispersion at the receive end using specific algorithms, eliminating the need of DCMs for dispersion compensation. This simplifies network design and saves some space in equipment rooms.

Other related questions:
Whether a 100G WDM system can use the optical-layer subracks for a 40G non-coherent system
Yes, but this hybrid transmission application needs to be evaluated based on network conditions.

Differences in commissioning a non-coherent system and a coherent system
The main difference in commissioning a non-coherent system and a coherent system is the position of the transmit-end EVOA. In a coherent system, the transmit-end EVOA is always located after the OA board. In a non-coherent system, the transmit-end EVOA is located after the OA board only in the non-standard fiber access mode.

Coherent systems
As mobile networks evolve towards LTE, smart terminals are widely used, and new services such as FBB users' IPTV, VoD, and cloud computing continue to emerge, the transmission capacity of conventional networks cannot meet requirement. To address the requirements, Huawei introduces transmission systems using the coherent technology. Huawei coherent transmission systems use advanced technologies such as ePDM-QPSK, ePDM-BPSK, and coherent detection to meet the high-speed transmission requirements on OSNR, CD tolerance, PMD tolerance, and nonlinear effects. Huawei provides large-capacity coherent solutions, offering ultra-large bandwidths (100G and 40G). A system using a coherent board (such as LSC, LTX, TN15LSXL, TN55NS3, and TN54NS4) is a coherent transmission system.

Whether channel spacing needs to be configured during hybrid transmission of 100G and 40G wavelengths
In a hybrid transmission system using G.652 and LEAF fibers, the principles for configuring channel spacing (guard bands) are as follows: No guard band is required for hybrid transmission of 100G and 40G BPSK signals. No guard band is required for hybrid transmission of 100G and 40G DQPSK signals. No guard band is required for hybrid transmission of 40G BPSK and 40G DQPSK signals. For hybrid transmission of 100G and 10G/40G ODB signals, guard bands must be configured and the 100G and 10G/40G ODB signals can neighbor each other on only one side. For hybrid transmission of 40G BPSK and 10G/40G ODB signals, guard bands must be configured and the 40G BPSK and 10G/40G ODB signals can neighbor each other on only one side. Note: The needs for guard bands vary depending on networks. Therefore, configure guard bands based on the network design.

Whether the MCA802 board supports OSNR detection of 100G systems
The TN11MCA802 board can scan the OSNR of a 100G system when it works with the license of the intelligent wavelength monitoring management system and configures the functions of the OD.

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