Describes how Optical Line Terminal (OLT) line cards use out-of-band channels and photodiode monitors to verify connections with NCS1K-CCMD-16 line cards.
Summary
Line card connection verification ensures the integrity and correct identification of optical paths between OLTs and NCS1K-CCMD-16 line cards. This process relies on specialized channels, modulated signals, and dedicated photodiode monitors.
The key components involved in the process are:
-
OLT line card: Generates the verification tone and manages the initiation of the connection test.
- Connection Verification Tunable Laser (CV-TL): Produces a modulated tone at 191.175 THz, embedding the Cable ID pattern to identify the optical path.
- Photodiode monitors (PD21 and PD22 on the CCMD-16 card): Detect and buffer the Cable ID pattern from the incoming verification signals for validation by the node controller.
Connection verification between an OLT and NCS1K-CCMD-16 line cards is vital for maintaining reliable optical communication. Embedding the Cable ID in the verification signal helps identify the path under test and validates both out-of-band (OOB) and in-band (IB) connections.
Workflow
The process involves these stages:
- Tone generation: The OLT line card initiates the process by generating a verification tone using the CV-TL tuned at 191.175 THz.
- Cable ID modulation: The CV-TL tone is modulated with a low-frequency pattern that includes the Cable ID of the specific connection.
- Signal routing: The modulated CV-TL signal is transmitted via the OOB channel toward the CCMD-16 line card.
- Path identification: For verification toward the CCMD-16 card, the CV-TL signal is routed to photodiode PD21 (for OOB verification) and PD22 (for IB verification).
- Signal detection and buffering: PD21 or PD22 detects the verification signal and buffers the encoded Cable ID pattern.
- Verification by node controller: The node controller reads the buffered Cable ID pattern and confirms the identity and integrity of the optical path under test.
Result
This process enables automated, accurate verification of optical connections between OLTs and NCS1K-CCMD-16 line cards, ensuring each link is correctly identified and operational.
