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EnasYorl
Thieves World

join:2001-12-02
West

2 edits

1 recommendation

reply to qam64qam16

Re: Technical Discussion of Upstream Channel Bonding

Your LED's are BLUE or Green on US indicator?

But my point before was a TDMA carrier wouldn't be bonded based on the info I posted. If you are bonding a channel that is meant for 1.1 DOCSIS modems and 3.0 modems seems like a poor design choice the Return spectrum maybe has too much noise to support multiple 64QAM channels . If both your LED's are blue DS and US, i will admit i'm blown away.

For those whom like to read more on settings in CMTS.

 
cable modulation-profile
 
To define a modulation profile for use on the router, use the cable modulation-profile command in global configuration mode. To remove the entire modulation profile or to reset a default profile to its default values, use the no form of this command.
 
DOCSIS 1.0 and 1.1 Mixed Mode:
 
cable modulation-profile profile {mix | qam-16 | qpsk | robust-mix}
 
no cable modulation-profile profile {iuc | mix | qam-16 | qpsk | robust-mix}
 
cable modulation-profile profile iuc fec-tbytes fec-len burst-len guard-t mod scrambler seed diff pre-len last-cw uw-len
 
DOCSIS 1.x/2.0 Mixed Mode:
 
cable modulation-profile profile {mix-high | mix-low | mix-mid | mix-qam | qam-16 | qpsk | robust-mix-high | robust-mix-mid | robust-mix-qam}
 
no cable modulation-profile profile {iuc | mix-high | mix-low | mix-mid | mix-qam | qam-16 | qpsk | robust-mix-high | robust-mix-mid | robust-mix-qam}
 
cable modulation-profile profile iuc fec-tbytes fec-len burst-len guard-t mod scrambler seed diff pre-len last-cw uw-len
 
DOCSIS 2.0 A-TDMA Mode:
 
cable modulation-profile profile {mix-high | mix-low | mix-mid | mix-qam | qam-8 | qam-16 | qam-32 | qam-64 | qpsk | robust-mix-high | robust-mix-low | robust-mix-mid}
 
no cable modulation-profile profile {iuc | mix-high | mix-low | mix-mid | mix-qam | qam-8 | qam-16 | qam-32 | qam-64 | qpsk | robust-mix-high | robust-mix-low | robust-mix-mid}
 
cable modulation-profile profile iuc fec-tbytes fec-len burst-len guard-t mod scrambler seed diff pre-len last-cw uw-len
 
Cisco IOS Release 12.2(33)SCC and Later
 
DOCSIS 2.0 A-TDMA Mode and DOCSIS 2.0 S-CDMA Mode:
 
cable modulation-profile profile {mix-high | mix-low | mix-mid | mix-qam | qam-16 | qpsk | robust-mix-high | robust-mix-low | robust-mix-mid}
 
no cable modulation-profile profile {iuc | mix-high | mix-low | mix-mid | mix-qam | qam-16 | qpsk | robust-mix-high | robust-mix-low | robust-mix-mid}
 
cable modulation-profile profile iuc fec-tbytes fec-len burst-len guard-t mod scrambler seed diff pre-len last-cw uw-len
 
Syntax Description
 
profile
 
Specifies the modulation profile number. The valid values for the profile number depend on the cable interface being used and the upstream's mode of operation.
 
See Table 1 for a list of valid ranges based on cable interface and modulation type.
 
In Cisco IOS Release 12.2(15)CX and later releases, you can create a maximum of 10 profiles for each mode of operation, for a total of 30 profiles. In earlier software releases, you can create a maximum of 8 profiles only for DOCSIS 1.0 and DOCSIS 1.1 mode.
 
mix
 
(DOCSIS 1.0 and DOCSIS 1.1 mode only) Creates a default QPSK/16-QAM mix modulation profile where short and long grant bursts are sent using 16-QAM, while request, initial ranging, and station maintenance bursts are sent using QPSK). The burst parameters are set to their default values for each burst type.
 
mix-high
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 modes only) Creates a default QPSK/64-QAM modulation profile.
 
mix-low
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 modes only) Creates a default QPSK/16-QAM modulation profile.
 
mix-mid
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only) Creates a default QPSK/32-QAM modulation profile.
 
mix-qam
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only) Creates a default 16-QAM/64-QAM modulation profile.
 
qam-8
 
(DOCSIS 2.0 A-TDMA mode only) Creates a default 8-QAM modulation profile.
 
This modulation profile is available in hidden and internal mode only from Cisco IOS Release 12.2(33)SCC onwards.
 
qam-16
 
Creates a default 16-QAM modulation profile.
 
qam-32
 
(DOCSIS 2.0 A-TDMA mode only) Creates a default 32-QAM modulation profile.
 
This modulation profile is available in hidden and internal mode only from Cisco IOS Release 12.2(33)SCC onwards.
 
qam-64
 
(DOCSIS 2.0 A-TDMA mode only) Creates a default 64-QAM modulation profile.
 
This modulation profile is available in hidden and internal mode only from Cisco IOS Release 12.2(33)SCC onwards.
 
qpsk
 
Creates a default QPSK modulation profile.
 
robust-mix
 
(DOCSIS 1.0 and DOCSIS 1.1 mode only) Creates a default QPSK/16-QAM modulation profile with a longer preamble that is more robust and more able to deal with noise on the upstream better than the mix profile.
 
robust-mix-high
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only) Creates a default QPSK/64-QAM mixed modulation profile with a longer preamble that is more robust and more able to deal with noise on the upstream better than the mix-high profile.
 
robust-mix-low
 
(DOCSIS 2.0 A-TDMA mode only) Creates a default QPSK/16-QAM modulation profile with a longer preamble that is more robust and better able to deal with noise on the upstream than the mix-low profile.
 
robust-mix-mid
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only) Creates a default QPSK/32-QAM modulation profile with a longer preamble that is more robust and better able to deal with noise on the upstream than the mix-mid profile.
 
robust-mix-qam
 
(DOCSIS 1.x/2.0 mixed mode only) Creates a default 16-QAM/64-QAM mixed modulation profile with a longer preamble that is more robust and better able to deal with noise on the upstream than the mix-qam profile.
 
iuc
 
Interval usage code. Valid entries depend on the mode of operation:
 
•If the upstream is configured for DOCSIS 1.0 and DOCSIS 1.1 modulation profiles, the valid values are initial, long, request, reqdata, short, or station.
 
•If the upstream is configured for DOCSIS 1.x and DOCSIS 2.0 mixed modulation profiles, the valid values are a-long, a-short, a-ugs, initial, long, request, reqdata, short, or station.
 
•If the upstream is configured for DOCSIS 2.0 A-TDMA modulation profiles, the valid values are a-long, a-short, a-ugs, initial, long, request, reqdata, short, or station.
 
The reqdata burst type is included as a placeholder for scripts that might reference it, but the DOCSIS MAC scheduler on the Cisco CMTS does not use this type of burst.
 
When you are using the initial and station bursts for DOCSIS 2.0 A-TDMA mode, qam-8, qam-32, and qam-64 modulation profiles are available in hidden mode only.
 
preamble
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only, for a-long and a-short options) Specifies the preamble format. Valid values are qpsk0 and qpsk1.
 
rs-interleave-depth
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only, for a-long and a-short options) Specifies the RS interleave depth. The valid range is from 0 to 114.
 
rs-interleave-block
 
(DOCSIS 1.x/2.0 mixed and DOCSIS 2.0 A-TDMA modes only, for a-long and a-short options) Specifies the RS interleave block size. The valid range is from 18 to 2048.
 
fec-tbytes
 
The number of bytes that can be corrected per FEC code word. For DOCSIS 1.0 and DOCSIS 1.1 mode, valid values are from 0 to 10 (decimal), where 0 means no FEC. For DOCSIS 2.0 A-TDMA mode, the valid values are from 0 to 16 (decimal), where 0 means no FEC.
 
fec-len
 
FEC code-word length. Valid values are from 16 to 253.
 
burst-len
 
Maximum burst length in minislots. Valid values are from 0 to 255, where 0 means no limit.
 
guard-t
 
Guard time in symbols. The time between successive bursts, with a range from 22 to 255. (In Cisco IOS Release 12.2(15)BC2 and earlier releases, the minimum guard time was 0 symbols, but we do not recommend using a guard time smaller than 22 symbols.)
 
mod
 
Modulation. Valid entries are 16qam and qpsk for DOCSIS 1.0 and DOCSIS 1.1 upstreams. Valid entries are 8qam, 16qam, 32qam, 64qam, and qpsk for DOCSIS 2.0 upstreams.
 
The qam-8, qam-32, and qam-64 modulation profiles are available in hidden and internal modes only from Cisco IOS Release 12.2(33)SCC onwards.
 
scrambler
 
Enable or disable scrambler. Valid entries are scrambler and no-scrambler.
 
seed
 
(Required if scrambler option used) Scrambler seed in hexadecimal format. Valid values are from 0x0 to 0x7FFF.
 
diff
 
Enable or disable differential encoding. Valid entries are diff and no-diff.
 
In DOCSIS 2.0 mode, differential encoding cannot be enabled for the 8-QAM, 32-QAM, and 64-QAM modulations.
 
The qam-8, qam-32, and qam-64 modulation profiles are available in hidden and internal modes only from Cisco IOS Release 12.2(33)SCC onwards.
 
pre-len
 
Preamble length in bits. Valid values are from 2 to 256.
 
last-cw
 
Handling of FEC for last code word. Valid entries are fixed for fixed code-word length and shortened for shortened last code word.
 
uw-len
 
Upstream unique word length. Enter uw8 for 8-bit unique code words or uw16 for 16-bit unique code words.
 
Command Default
 
Modulation profile 1 is defined as a qpsk Time Division Multiple Access (TDMA) profile.
 
In Cisco IOS Release 12.2(15)CX, Release 12.2(15)BC2 and later releases, additional modulation profiles are defined as the default mixed TDMA/A-TDMA profile and the default Advanced TDMA (A-TDMA) profile. See Table 1 for a list of valid ranges based on cable interface and modulation type.
 
Command Modes
 
Global configuration (config)
 
Command History
 
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_06_cable_m.html


EnasYorl
Thieves World

join:2001-12-02
West

1 recommendation

A interesting read as well
Webview
»docs.google.com/viewer?a=v&q=cac···RAbDv4_Q

PPT link »www.google.com/url?sa=t&rct=j&q=···fxHV8Z2A