CMC Module Specifications

wanglei259 · Created Oct 18, 2018 01:12:23

useful document

yjhd · Created Oct 18, 2018 01:18:29

very good, this is very useful for me, would you please continue to share related knowlege? This post was last edited by yjhd at 2018-10-31 09:08.

Torrent · Created Oct 18, 2018 02:11:00

DOCSIS 3.1 MER test conditions:

192 MHz OFDM channel, total frequency width 528 MHz (2 x 192 MHz + 144 MHz)
Equal to 88 DOCSIS 3.0 channels (calculated using the U.S. standard 6M channel bandwidth)

ater read this, I got your point. thanks you very much author to sharing us a good example.

This post was last edited by Torrent at 2018-10-31 07:28.

Finn92 · Created Oct 18, 2018 06:33:32

I am very interested for this sharing , which is very helpful to our daily work.

and the notice is very important , we should obey the rules , like :

When the configured upstream input level is out of the value range specified by the protocol, the CMC adjusts the upstream input level. According to the DOCSIS 3.1 standard, upstream input levels vary according to modulation modes.

This post was last edited by Finn92 at 2018-10-31 05:59.

Skay · Created Oct 18, 2018 10:57:37

Thanks for your sharing , please take care the note part , because there are some limit for this situation .

The output level of each channel can be reduced based on the maximum output level. The CMC output is flat. The output level of each channel can be configured. Configure the output level for channels one by one. The maximum downstream output level can be set by running the cable downstreamchannel-id rf-power value command.

littlestone · Created Oct 18, 2018 10:59:41

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No.9527 · Created Oct 19, 2018 06:31:12

Reliable: Multiple powered devices (PDs) are powered by a single power-sourcing equipment (PSE) device, facilitating power backup.
Easy to deploy: Network terminals can be powered over network cables, without needing external power sources.
Standard: PoE complies with IEEE 802.3af and IEEE 802.3at, and all PoE devices use uniform power sources and can be connected to PDs of different vendors.

This post was last edited by No.9527 at 2018-10-31 06:34.

SupperRobin · Created Oct 19, 2018 09:25:06

CRC is a commonly used method to detect transmission errors in a communication system. It checks for transmission errors by adding redundancy codes to the original data. Transmission errors are more likely to be detected when more redundancy codes are added, but data is transmitted at a lower efficiency. Use the 16-bit or 32-bit CRC mode as required.

The serial interface has been configured to work in synchronous mode by using the physical-mode command.

If you run the crc command multiple times in the same serial interface view, only the latest configuration takes effect.

This post was last edited by SupperRobin at 2018-10-31 06:50.

littlestone · Created Oct 23, 2018 07:32:21

After performing the following operations to restart the device, you can log in to the device through the console port without entering the password only this time. The original console port login password is still saved in the configuration file. This post was last edited by littlestone at 2018-10-31 06:14.

Performance Parameter of the DOCSIS Module	Description	Notes
Standards compliance	DOCSIS 3.1, DOCSIS 3.0 or DOCSIS 2.0	-
Upstream communication protocol	ATDMA, OFDMA	-
Channel width	DOCSIS 3.1: Downstream: 192 MHz Upstream: 96 MHz DOCSIS 3.0 European standard: Downstream: 8 MHz Upstream: 1.6 MHz, 3.2 MHz, or 6.4 MHz DOCSIS 3.0 North American standard: Downstream: 6 MHz Upstream: 1.6 MHz, 3.2 MHz, or 6.4 MHz	-
Max number of channels	Downstream: DOCSIS 3.1: 2 DOCSIS 3.0: 32 BC+VoD: 64 SC-QAM channels Upstream: DOCSIS 3.1: 2 DOCSIS 3.0: 10	-
Modulation	DOCSIS 3.1: Downstream: 16 QAM, 64 QAM, 128 QAM, 256 QAM, 512 QAM, 1024 QAM, 2048 QAM or 4096 QAM Upstream: BPSK, QPSK, 16 QAM, 32 QAM, 64 QAM, 128 QAM, 256 QAM, 512 QAM, 1024 QAM or 2048 QAM DOCSIS 3.0: Downstream: 64 QAM or 256 QAM Upstream: QPSK, 16 QAM, 32 QAM, 64 QAM, or 256 QAM	-
Maximum QAM output level (obtained based on the number of CMC channels)	33 dBmV @ 160 channels 34 dBmV @ 128 channels 38 dBmV @ 64 channels 42 dBmV @ 32 channels 45 dBmV @ 16 channels 49 dBmV @ 8 channels 52 dBmV @ 4 channels 56 dBmV @ 2 channels 60 dBmV @ 1 channel	1
Output impedance	75 ohms	-
Upstream input level (can be configured using software)	DOCSIS 3.1: -10 to 10 dBmV @ 1.6 MHz DOCSIS 3.0: -13 to 17 dBmV @ 1.6 MHz -10 to 20 dBmV @ 3.2 MHz -7 to 23 dBmV @ 6.4 MHz	2
Downstream MER	DOCSIS 3.1: 87-600 MHz: ≥ 48 dB (a single carrier) ≥ 50 dB (average value of multiple OFDM channels) 600-1002 MHz ≥ 45 dB (a single carrier) ≥ 47 dB (average value of multiple OFDM channels) 1002-1218 MHz: ≥ 43 dB (a single carrier) ≥ 45 dB (average value of multiple OFDM channels) DOCSIS 3.0: ≥ 43 dB (after equalization) ≥ 35 dB (before equalization)	3 and 4

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