TN11MR402

TN11MR402 is a Huawei optical add/drop multiplexing board for the OSN 7500, handling 4 channels. It drops and adds specific wavelengths at a site while the rest of the channels pass straight through untouched, which is what lets a site take its own traffic off a fibre without terminating the whole line system.

Which channel this actually is. The part is fixed to 192.80 THz, a wavelength of about 1554.94 nm, in the C-band. That is the most important line on this page, because a fixed-wavelength part is not tunable: it either matches the channel plan at both ends of the span or it is the wrong part.

That frequency sits on the standard 100 GHz ITU grid, the widest-spaced and most forgiving plan. It will also drop and add on 50 GHz equipment, since every 100 GHz channel is also a 50 GHz channel, so this one is unusually easy to place.

This is SDH-generation equipment, and SDH is a legacy transport technology. The industry moved to packet and to OTN years ago, and the OSN 7500 is not a platform anyone is designing a new network around in 2026.

That is not the same as saying it is useless. A great deal of SDH is still in service carrying E1 and STM-n circuits that work perfectly well, in utilities, rail, broadcast, defence and government networks where the circuits outlive the fashion in transport technology. If that is what you are maintaining, this keeps it running. If you are being offered SDH for something new, push back.

What to confirm before ordering. The channel plan for the whole route, not just this site, because add/drop boards have to agree with each other along the line. Whether your line system is CWDM or DWDM, and at what spacing. And the subrack and software release, because board support depends on both. Send us the route and the channel plan and we will match the boards to it site by site.

Green Code Technologies supplies Huawei optical transport equipment, including amplification, filtering and compensation. We are a supplier of Huawei alongside HPE, Dell, Cisco, Samsung and Netgear, and we would rather confirm a part against Huawei’s own documentation than sell you the wrong one, which on OSN 7500 equipment is worth doing. Send us the span, the fibre type, the channel plan and the levels at each end and we will come back with a straight answer.