Motorola870
Motorola870 What I found interesting is that they are discontinuing the 5-204MHz digital return path modules for GS7000 nodes so they are essentially ending support for high-split on the legacy GS7000 nodes.
ATX already had this planned out:
https://www.lightreading.com/cable-technology/atx-plots-upgrade-path-to-docsis-4-0
ATX is ending sales of the LEGACY high-split node transmitters. rPHY DAA modules will used in Charter phase 2 and higher, which support high-split and better.
Harmonic announced their GS7000 compatible RPD:
https://www.harmonicinc.com/press-releases/harmonic-breathes-new-life-into-cisco-gs7000-node
Vecima announced their GS7000 compatible RPD::
https://vecima.com/press-release/vecima-announces-next-generation-remote-phy-device-rpd-with-upgrade-paths-for-third-party-cable-access-nodes/
For the legacy high-split nodes, as FMD stated, Commscope transmitters are available, by way of an GS7000 adapter.
https://quotes.digicomm.com/product-category/nodes/gs7k-digital-return-commscope/
That includes the Commscope DT4600 high-split digital transmitter, which also fit in the OM4120 nodes.
https://www.commscope.com/globalassets/digizuite/724624-dt4600.pdf