Gangwar89

 ### **OSC in DWDM Systems: Overview & Working Principle** #### **1. What is OSC in DWDM?** - **OSC (Optical Supervisory Channel)** is a dedicated communication channel used in **Dense Wavelength Division Multiplexing (DWDM)** systems for monitoring, control, and management of optical networks. - It operates on a **separate wavelength** (typically **1510 nm, 1625 nm, or 1310 nm**) outside the main DWDM signal band (C-band or L-band). - Unlike data channels, OSC carries **low-speed management data** rather than user traffic. #### **2. Purpose of OSC** - **Real-time monitoring** of optical amplifiers, transponders, and fiber health. - **Fault detection & alarm reporting** (e.g., fiber cuts, amplifier failures). - **Remote configuration & control** of network elements (e.g., adjusting amplifier gain). - **Performance tracking** (OSNR, power levels, BER). - **Ensuring synchronization** between nodes in the DWDM network. #### **3. How OSC Works** ##### **A. Transmission ...

 The **MTU (Maximum Transmission Unit)** size on an **OSN client port for 100G** (e.g., Huawei OSN series) typically depends on the network configuration and requirements. However, here are some general guidelines: ### **Default MTU for OSN 100G Client Ports:** - **Standard Ethernet (e.g., 100GE, 10GE, 1GE):**     - **Default MTU:** **1500 bytes** (standard for Ethernet/IP networks).     - **Jumbo Frames Support:** Some networks use **9000 bytes** (or higher) for jumbo frames, but this must be end-to-end configured. ### **Considerations:** 1. **OTN/WDM Transport:**      - If the client port is mapped into OTN (e.g., OTU4 for 100G), the MTU is not directly configurable on the optical layer, but the client interface (e.g., Ethernet) still follows standard MTU rules.     2. **Q-in-Q or VLAN Tagging:**      - If VLAN tags (802.1Q) are used, the **actual payload MTU decreases by 4 bytes per tag** (e.g., **15...