Hello, everyone!
In this post, I would like to share with you how to upgrade from 40-channel system to 80-channel system.
Background and Requirements
Upgrading the Optix OSN 6800 or Optix OSN 8800 is similar to upgrading the Optix BWS 1600G. This document describes how to upgrade the Optix BWS 1600G for illustration.
Procedure of Re-Constructing
1. Check the software version of each NE and each OTU on the NE to see whether they support the upgrade.
2. Plan the re-construction scheme for each site according to the power budget and OSNR budget.
3. Draw all-fiber connections of each site to be re-constructed for all the existing and new services.
4. After the re-construction, the per-channel power of the system decreases by 3 dB and so does the OSNR of the system. As a result, OSNR may not meet the requirement. In this case, re-compute OSNR and check whether OSNR meets the requirements of the existing services and new services. If not, solve the problem by changing the board type (upgrading an NRZ board to a DRZ board) or adding a regeneration board.
5. Prepare the M40/D40 (odd-channel), ITL, and WMU boards, and fibers, which are required for the re-constructions. You also need to check whether the fixed attenuation at the receiving end of the OTU needs to be changed after the re-construction according to the rules of configuring attenuators.
6. Before the re-construction, test the optical power and OSNR of the current optical amplifier (OA) to see whether they meet requirements. If not, maintain them before the re-construction.
7. Notify customers of service cut-over before the re-construction. Do not interrupt any service unless the customer agrees to do so.
8. Install the M40/D40 (odd-channel), ITL, WMU, and OTU boards in the subrack, and then route fibers from the OTU to the customer ODF, from the OTU to the M40/D40 (odd-channel), from the M40/D40 (odd-channel) to the ITL, and from the WMU to the MON port on the transmit OA. Also route fibers from the M40/D40 (even-channel) to the ITL for preparation. Test the fiber connections and check whether new fixed attenuators are installed on the OTU. Then, wait until it is suitable to interrupt services.
9. When it is suitable to interrupt services, set external wavelength lockout for the WMU board. For details, see the WMU Board Deployment Guide.
10. Disconnect the fiber from the OUT port on the existing even-channel M40 or IN port on the existing even-channel D40, and then connect the fiber routed from the OUT port on the new even-channel M40 or IN port on the new even-channel D40 to the ITL.
11. Test the input optical power of the transmit OA by using an optical spectrum analyzer, and adjust the *** so that the input optical power of the transmit OA is equal to the standard per-channel optical power. Then, connect the fiber to the input port on the transmit OA.
12. The optical power at the OLA site does not need to be adjusted. Test the OSNR at the receiving end. The OSNR meets the design requirement. Replace the fixed attenuator at the receiving end of the OTM site according to the preceding design and the attenuator configuration rule for an 80-channel board.
That's all, I hope you like it.
Thank you!
