Hi folks !
Little question, I am trying in my lab to measure the maximum upstream speed with Docsis 1.1/2.0 CM and CMTS and I am blocked with a maximum speed of about 2.5 Mbps independently what the CM vendor/model it is (tested with Motorola, Cisco/Scientific Atlanta, Technicolor/Thomson). Upstream has 3.2MHz bandwidth, and QAM16 modulation.
If I take a Docsis 3.0 CM with the same CMTS configuration, I have the same limitation.
With a Docsis 3.0 CM, I have to enable MTC mode (even on 1 upstream !) - keeping the same 3.2 MHz bandwidth and QAM16 modulation - to reach an acceptable speed of 8Mbps. I know that Docsis 3.0 implements a new upstream scheduler for MTC-enabled CMs, explaining why I can so easily reach this speed.
However, I would like to exceed the 2.5Mbps maximum speed for my CMs without needing to turn on MTC-mode on my production CMTS (I don't have more than one upstream per node, on current days).
Does someone here have some tips & tricks to share to reach a speed higher than 2.5Mbps with Docsis 1.1/2.0 CM and CMTS ? (CM configuration file ? Cisco CMTS configuration)