UBR10k PRE4 MC5x20H SIP-600 Wideband SPA
IOS SG6
rfgw-1d
DTI server
8 DS (3 Primary) from SPA and 4 or 2 US with MC5x20H.
We get speeds of more than 100 Mbit/s in DS and only 1 Mbit/s in US on D3 modem (Arris CM820, Technicolor 7200.d).
At the same time, any D2 modem on these US get 2.7 Mbit/s. There is no load on US.
I can't find the reason.
interface Cable6/1/2
downstream Modular-Cable 1/3/0 rf-channel 3 upstream 0-5
downstream Modular-Cable 1/3/0 rf-channel 7 upstream 0-5
downstream Modular-Cable 1/3/0 rf-channel 11 upstream 0-5
cable tftp-enforce mark-only
cable mtc-mode
cable shared-secret 7 Z98X375375HJE
no cable packet-cache
cable default-phy-burst 4000
cable bundle 1
cable downstream channel-id 150
cable downstream annex A
cable downstream modulation 256qam
cable downstream frequency 186000000
no cable downstream rf-shutdown
cable downstream rf-power 48
cable upstream max-ports 6
cable upstream bonding-group 6120
upstream 0
upstream 2
upstream 4
upstream 5
attributes 80000000
cable upstream bonding-group 6121
upstream 1
upstream 3
attributes 80000000
cable upstream 0 connector 2
cable upstream 0 spectrum-group 10
cable upstream 0 channel-width 3200000 1600000
cable upstream 0 power-level 15
cable upstream 0 docsis-mode atdma
cable upstream 0 minislot-size 2
cable upstream 0 range-backoff 3 6
cable upstream 0 modulation-profile 222 223
cable upstream 0 equalization-coefficient
no cable upstream 0 shutdown
cable upstream 1 connector 6
cable upstream 1 spectrum-group 1
cable upstream 1 channel-width 3200000 1600000
cable upstream 1 power-level 20
cable upstream 1 docsis-mode atdma
cable upstream 1 minislot-size 2
cable upstream 1 range-backoff 3 6
cable upstream 1 modulation-profile 222 223
cable upstream 1 equalization-coefficient
no cable upstream 1 shutdown
cable upstream 2 connector 10
cable upstream 2 spectrum-group 20
cable upstream 2 channel-width 3200000 1600000
cable upstream 2 power-level 15
cable upstream 2 docsis-mode atdma
cable upstream 2 minislot-size 2
cable upstream 2 range-backoff 3 6
cable upstream 2 modulation-profile 222 223
cable upstream 2 equalization-coefficient
no cable upstream 2 shutdown
cable upstream 3 connector 6
cable upstream 3 spectrum-group 2
cable upstream 3 channel-width 3200000 1600000
cable upstream 3 power-level 20
cable upstream 3 docsis-mode atdma
cable upstream 3 minislot-size 2
cable upstream 3 range-backoff 3 6
cable upstream 3 modulation-profile 222 223
cable upstream 3 equalization-coefficient
no cable upstream 3 shutdown
cable upstream 4 connector 2
cable upstream 4 spectrum-group 30
cable upstream 4 channel-width 3200000 1600000
cable upstream 4 power-level 15
cable upstream 4 docsis-mode atdma
cable upstream 4 minislot-size 2
cable upstream 4 range-backoff 3 6
cable upstream 4 modulation-profile 222 223
cable upstream 4 equalization-coefficient
no cable upstream 4 shutdown
cable upstream 5 connector 10
cable upstream 5 spectrum-group 40
cable upstream 5 channel-width 3200000 1600000
cable upstream 5 power-level 15
cable upstream 5 docsis-mode atdma
cable upstream 5 minislot-size 2
cable upstream 5 range-backoff 3 6
cable upstream 5 modulation-profile 222 223
cable upstream 5 equalization-coefficient
no cable upstream 5 shutdown
cable privacy bpi-plus-policy total-enforcement
no keepalive
cable fiber-node 13
description m3-d13a-d2a
downstream Modular-Cable 1/3/0 rf-channel 0-15
downstream Cable6/1/2
upstream Cable 6/1 connector 6
sh int cable 6/1/2 upstream bonding-group
Cable6/1/2: Upstream Bonding Group 6120
2118450952 packets input, 1763172300159 octets input
Segments: 1412402541 valid, 23738 discarded, 23738 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 61440000 bits/sec
Total Service Flows On This Bonding Group: 8
Cable6/1/2: Upstream Bonding Group 6121
596847888 packets input, 139070034084 octets input
Segments: 419163292 valid, 7003869 discarded, 7003873 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 30720000 bits/sec
Total Service Flows On This Bonding Group: 9
Cable6/1/2: Upstream Bonding Group 65536
141745917 packets input, 196215241987 octets input
Segments: 121341417 valid, 2197 discarded, 2197 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 15360000 bits/sec
Total Service Flows On This Bonding Group: 0
Cable6/1/2: Upstream Bonding Group 65537
0 packets input, 0 octets input
Segments: 0 valid, 0 discarded, 0 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 15360000 bits/sec
Total Service Flows On This Bonding Group: 0
Cable6/1/2: Upstream Bonding Group 65538
0 packets input, 0 octets input
Segments: 0 valid, 0 discarded, 0 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 15360000 bits/sec
Total Service Flows On This Bonding Group: 0
Cable6/1/2: Upstream Bonding Group 65539
0 packets input, 0 octets input
Segments: 0 valid, 0 discarded, 0 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 15360000 bits/sec
Total Service Flows On This Bonding Group: 0
Cable6/1/2: Upstream Bonding Group 65540
0 packets input, 0 octets input
Segments: 0 valid, 0 discarded, 0 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 15360000 bits/sec
Total Service Flows On This Bonding Group: 0
Cable6/1/2: Upstream Bonding Group 65541
0 packets input, 0 octets input
Segments: 0 valid, 0 discarded, 0 lost
Reserved Bandwidth Max : 0 bits/sec
Reserved Bandwidth : 0 bits/sec
Available Bandwidth : 15360000 bits/sec
Total Service Flows On This Bonding Group: 0
sh cable mac-domain cable 6/1/2 upstream-service-group
Cable MD 6/1/2
US-SG-ID : 1 US-Chan : U0,2,4,5
US-SG-ID : 2 US-Chan : U1,3
Primary-DS: 6/1/2:0 US-SG-ID: 1,2
MDD US-List : U0,1,2,3,4,5
MDD Ambiguity : U0,1,2,3,4,5
Primary-DS: 1/3/0:3 US-SG-ID: 1,2
MDD US-List : U0,1,2,3,4,5
MDD Ambiguity : U0,1,2,3,4,5
Primary-DS: 1/3/0:7 US-SG-ID: 1,2
MDD US-List : U0,1,2,3,4,5
MDD Ambiguity : U0,1,2,3,4,5
Primary-DS: 1/3/0:11 US-SG-ID: 1,2
MDD US-List : U0,1,2,3,4,5
MDD Ambiguity : U0,1,2,3,4,5
sh cable fiber-node 13
---------------------------------------------------------------------------------
Fiber-Node 13
Description: m3-d13a-d2a
Channel(s) : downstream Modular-Cable 1/3/0: 0-15
Channel ID(s): 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208
Channel : downstream Cable 6/1/2
Channel ID : 150
upstream Cable 6/1: 6
FN Config Status: Configured (status flags = 0x01)
MDD Status: Valid
sh cable modem 4432.c873.ebdc verbose
MAC Address : 4432.c873.ebdc
IP Address : 172.16.2.112
IPv6 Address : ---
Dual IP : N
Prim Sid : 138
Host Interface : C6/1/2/UB
MD-DS-SG / MD-US-SG : 1 / 2
MD-CM-SG : 0x2F0102
Primary Wideband Channel ID : 98 (Wi1/3/0:1)
Primary Downstream : Mo1/3/0:11 (RfId : 83)
Wideband Capable : Y
RCP Index : 3
RCP ID : 00 10 00 10 08
Downstream Channel DCID RF Channel : 204 1/3/0:11
Downstream Channel DCID RF Channel : 201 1/3/0:8
Downstream Channel DCID RF Channel : 202 1/3/0:9
Downstream Channel DCID RF Channel : 203 1/3/0:10
Downstream Channel DCID RF Channel : 205 1/3/0:12
Downstream Channel DCID RF Channel : 206 1/3/0:13
Downstream Channel DCID RF Channel : 207 1/3/0:14
Downstream Channel DCID RF Channel : 208 1/3/0:15
Extended Upstream Transmit Power : 0dB
Multi-Transmit Channel Mode : Y
Number of US in UBG : 2
Upstream Channel : US1 US3
Ranging Status : sta sta
Upstream SNR (dB) : 22.4 33.61
Received Power (dBmV) : 21.00 20.00
Reported Transmit Power (dBmV) : 50.00 48.50
Peak Transmit Power (dBmV) : 54.00 54.00
Phy Max Power (dBmV) : 54.00 54.00
Minimum Transmit Power (dBmV) : 20.00 20.00
Timing Offset (97.6 ns): 1124 1124
Initial Timing Offset : 1124 1124
Rng Timing Adj Moving Avg(0.381 ns): 0 0
Rng Timing Adj Lt Moving Avg : 0 0
Rng Timing Adj Minimum : 0 0
Rng Timing Adj Maximum : 0 65536
Pre-EQ Good : 91709 1788
Pre-EQ Scaled : 7808 115
Pre-EQ Impulse : 82 0
Pre-EQ Direct Loads : 5 0
Good Codewords rx : 482272 512767
Corrected Codewords rx : 19708 10392
Uncorrectable Codewords rx : 45205 20
Phy Operating Mode : atdma* atdma*
sysDescr : Technicolor Cable Voice and Wireless Gateway <>
Downstream Power : 6.70 dBmV (SNR = 40.90 dB)
MAC Version : DOC3.0
QoS Provisioned Mode : DOC1.1
Enable DOCSIS2.0 Mode : Y
Modem Status : {Modem= w-online(pt), Security=assign(tek)}
Capabilities : {Frag=N, Concat=N, PHS=Y}
Security Capabilities : {Priv=BPI+, EAE=Y, Key_len=56,128}
L2VPN Capabilities : {L2VPN=N, eSAFE=N}
Sid/Said Limit : {Max US Sids=16, Max DS Saids=15}
Optional Filtering Support : {802.1P=N, 802.1Q=N, DUT=N}
Transmit Equalizer Support : {Taps/Symbol= 1, Num of Taps= 24}
Number of CPE : 1(Max CPE = 5)
Number of CPE IPs : 1(Max CPE IPs = 16)
CFG Max-CPE : 5
Flaps : 44(Aug 20 03:06:13)
Errors : 0 CRCs, 0 HCSes
Stn Mtn Failures : 0 aborts, 25 exhausted
Total US Flows : 1(1 active)
Total DS Flows : 1(1 active)
Total US Data : 725846 packets, 135684828 bytes
Total US Throughput : 3944 bits/sec, 4 packets/sec
Total DS Data : 3035049 packets, 4109555690 bytes
Total DS Throughput : 4040 bits/sec, 2 packets/sec
LB group ID assigned (index) : 2150564098 (44812)
LB group ID in config file (index) : N/A (N/A)
LB policy ID : 0
LB policy ID in config file : 0
LB priority : 0
Tag :
Required DS Attribute Mask : 0x0
Forbidden DS Attribute Mask : 0x0
Required US Attribute Mask : 0x0
Forbidden US Attribute Mask : 0x0
Service Type ID :
Service Type ID in config file :
Ranging Class ID : 0x6
Active Classifiers : 0 (Max = NO LIMIT)
CM Upstream Filter Group : 0
CM Downstream Filter Group : 0
CPE Upstream Filter Group : 0
CPE Downstream Filter Group : 0
DSA/DSX messages : permit all
Voice Enabled : NO
DS Change Times : 0
Boolean Services : 2
Number of Multicast DSIDs Support : 16
MDF Capability Mode : 2
IGMP/MLD Version : IGMPv3
FCType10 Forwarding Support : Y
Features Bitmask : 0x0
Total Time Online : 20h58m (20h58m since last counter reset)
CM Initialization Reason : POWER_ON
CFG Max IPv6 CPE Prefix : 16 (-1 used)
CM config file :
for the upstream flow, set max-burst and max-concat-burst to something large eg 28000
For the CMTS :
int cable 6/1/2
cable upstream balance-scheduling
cable up 0 minislot-size 4
cable up 1 minislot-size 4
cable up 2 minislot-size 4
cable up 3 minislot-size 4
cable up 4 minislot-size 4
cable up 5 minislot-size 4
cable sid-cluster-group num-of-cluster 2
cable sid-cluster-switching max-request 4
Consider using 6.4 channels rather than 3.2.
If you do change to 6.4, then change the mini-slot size to 2.
Power-level 15, and power-level 20.
That sounds pretty strange.
Why are you configuring this ?
Upstream Channel : US1 US3
Upstream SNR (dB) : 22.4 33.61 <==== 22 is bad
Received Power (dBmV) : 21.00 20.00 <===== Very high, due to your power-level 20 command
Reported Transmit Power (dBmV) : 50.00 48.50 <===== Pretty high
Probably you need to check your plant balancing and/or headend wiring.
Possible solution is to remove the power-level 20 command and instead put a 10 or 16dB attenuator on your return combiner port, just in front of the CMTS US lead
I tried tuning the reverse channel, it doesn't help.
Unfortunately, I couldn't try cable upstream balance-scheduling, only starting with SCH release.
power-level 20 because the optical receiver of the reverse channel amplifies by 20 db. I tried to set the attenuator to 20 and do power-level 0, it doesn't affect. Extra gain is certainly not good.
The problem is only with D3 modems. If you connect a D2 modem at the same point, it shows 2.8 Mbit / s in US. D3 is less than 1 Mbit/s.
SNR 22 is really a problem. A drop in SNR on a single US in UBG can greatly reduce the overall throughput of UBG?
2.8Mbit for DOCSIS 2.0 is not right ! It can be dramatically improved.
1.0Mbps for DOCSIS 3.0 is not definitely not right.
What is your modulation-profile 222. 64QAM?
What is your modulation-profile 223. 16QAM?
3.2width 16qam = aggregate 8.9Mbps available
3.2width 64qam = aggregate 13.3Mbps available
6.4width 16qam = aggregate 17.8Mbps available
6.4width 64qam = aggregate 26.7Mbps available
When the right settings are used on CMTS and in CM config file, individual D2.0 modems can get close to these speeds.
And D3.0 modems will be 2X 3X 4X etc.
Without the tweaks you will be capped at like 2 to 3Mbps max
For 3.2 width, change the minislot-size from default 2 to 4. Important!
For 6.4 width, change the minislot-size from default 1 to 2. Important!
For the upstream service flow, set the max-burst and max-concat-burst to something large like 28800. Important!
For D3.0, cable upstream service flow balancing will help ensure the utilisation is spread evenly across all channels
If your IOS is too old, you should try and upgrade
For D3.0, Sid cluster tweaks allow the modem to fill more channels (important if you are doing 4 channel US bonding)
Your upstream channel power sounds not right
How is your headend wired?
Is it like this ?
node -> receiver -> splitters -> attenuator -> cmts upstream cable
The optical receiver's output is proportional to the optical input. Higher optical input (closer node) = higher RF output.
The receiver will have a built-in variable attenuator, which is used to adjust/balance each receiver to output the same RF level eg 40dBmV
Splitters then may take eg 26dB.
Attenuator then may be eg 10dB or 16dB.
Add this up you are hitting CMTS at around 0 = happy days.
Setting power level to 20 is definitely not normal. You should generally leave at the default 0.
sh cable modem 4432.c873.ebdc verbose
...
Upstream Channel : US1 US3
...
Upstream SNR (dB) : 26.33 33.61
...
But of course power-level 20 is the reason to seriously deal with US in the cable network.
The last thing I did before:
1) added a second Wideband SPA
2) replaced PRE2 with PRE4
+ replaced wideband SIP with SIP-600
+ updated SCF5 to SCG6
I'll try to find out when the problem occurred.
Current configuration:
interface Cable6/1/2
downstream Modular-Cable 1/3/0 rf-channel 3 upstream 0-5
downstream Modular-Cable 1/3/0 rf-channel 7 upstream 0-5
downstream Modular-Cable 1/3/0 rf-channel 11 upstream 0-5
cable tftp-enforce mark-only
cable mtc-mode
cable shared-secret 7 043532B78382F3C
no cable packet-cache
cable default-phy-burst 4000
cable bundle 1
cable downstream channel-id 150
cable downstream annex A
cable downstream modulation 256qam
cable downstream frequency 186000000
no cable downstream rf-shutdown
cable downstream rf-power 48
cable upstream max-ports 6
...
cable upstream bonding-group 6121
upstream 1
upstream 3
attributes 80000000
...
cable upstream 1 connector 6
cable upstream 1 spectrum-group 1
cable upstream 1 channel-width 3200000 1600000
cable upstream 1 docsis-mode atdma
cable upstream 1 minislot-size 2
cable upstream 1 range-backoff 3 6
cable upstream 1 modulation-profile 222 223
cable upstream 1 equalization-coefficient
no cable upstream 1 shutdown
...
cable upstream 3 connector 6
cable upstream 3 spectrum-group 2
cable upstream 3 channel-width 3200000 1600000
cable upstream 3 docsis-mode atdma
cable upstream 3 minislot-size 2
cable upstream 3 range-backoff 3 6
cable upstream 3 modulation-profile 222 223
cable upstream 3 equalization-coefficient
no cable upstream 3 shutdown
...
cable privacy bpi-plus-policy total-enforcement
no keepalive
!
profile 222 - QAM64
profile 223 - QAM16
Tweaks do not help, the speed is 100+/1 Mbit/s.
sh cable modem 4432.c873.ebdc verbose
MAC Address : 4432.c873.ebdc
IP Address : 172.16.2.112
IPv6 Address : ---
Dual IP : N
Prim Sid : 44
Host Interface : C6/1/2/UB
MD-DS-SG / MD-US-SG : 2 / 2
MD-CM-SG : 0x2F0202
Primary Wideband Channel ID : 98 (Wi1/3/0:1)
Primary Downstream : Mo1/3/0:11 (RfId : 83)
Wideband Capable : Y
RCP Index : 3
RCP ID : 00 10 00 10 08
Downstream Channel DCID RF Channel : 204 1/3/0:11
Downstream Channel DCID RF Channel : 201 1/3/0:8
Downstream Channel DCID RF Channel : 202 1/3/0:9
Downstream Channel DCID RF Channel : 203 1/3/0:10
Downstream Channel DCID RF Channel : 205 1/3/0:12
Downstream Channel DCID RF Channel : 206 1/3/0:13
Downstream Channel DCID RF Channel : 207 1/3/0:14
Downstream Channel DCID RF Channel : 208 1/3/0:15
Extended Upstream Transmit Power : 0dB
Multi-Transmit Channel Mode : Y
Number of US in UBG : 2
Upstream Channel : US1 US3
Ranging Status : sta sta
Upstream SNR (dB) : 36.12 33.97
Received Power (dBmV) : 0.50 -0.50
Reported Transmit Power (dBmV) : 50.00 48.50
Peak Transmit Power (dBmV) : 54.00 54.00
Phy Max Power (dBmV) : 54.00 54.00
Minimum Transmit Power (dBmV) : 20.00 20.00
Timing Offset (97.6 ns): 1124 1124
Initial Timing Offset : 1124 1124
Rng Timing Adj Moving Avg(0.381 ns): -3 -1
Rng Timing Adj Lt Moving Avg : -20 0
Rng Timing Adj Minimum : -256 -256
Rng Timing Adj Maximum : 0 72704
Pre-EQ Good : 49 41
Pre-EQ Scaled : 2 5
Pre-EQ Impulse : 1 0
Pre-EQ Direct Loads : 0 0
Good Codewords rx : 24730 26947
Corrected Codewords rx : 454 684
Uncorrectable Codewords rx : 3015 25
Phy Operating Mode : atdma* atdma*
sysDescr : Technicolor Cable Voice and Wireless Gateway <>
Downstream Power : 6.30 dBmV (SNR = 40.30 dB)
MAC Version : DOC3.0
QoS Provisioned Mode : DOC1.1
Enable DOCSIS2.0 Mode : Y
Modem Status : {Modem= w-online(pt), Security=assign(tek)}
Capabilities : {Frag=N, Concat=N, PHS=Y}
Security Capabilities : {Priv=BPI+, EAE=Y, Key_len=56,128}
L2VPN Capabilities : {L2VPN=N, eSAFE=N}
Sid/Said Limit : {Max US Sids=16, Max DS Saids=15}
Optional Filtering Support : {802.1P=N, 802.1Q=N, DUT=N}
Transmit Equalizer Support : {Taps/Symbol= 1, Num of Taps= 24}
Number of CPE : 1(Max CPE = 5)
Number of CPE IPs : 1(Max CPE IPs = 16)
CFG Max-CPE : 5
Flaps : 0()
Errors : 0 CRCs, 0 HCSes
Stn Mtn Failures : 0 aborts, 0 exhausted
Total US Flows : 1(1 active)
Total DS Flows : 1(1 active)
Total US Data : 26281 packets, 8620084 bytes
Total US Throughput : 1876 bits/sec, 2 packets/sec
Total DS Data : 209030 packets, 301167930 bytes
Total DS Throughput : 4050 bits/sec, 4 packets/sec
LB group ID assigned (index) : 2150564354 (44812)
LB group ID in config file (index) : N/A (N/A)
LB policy ID : 0
LB policy ID in config file : 0
LB priority : 0
Tag :
Required DS Attribute Mask : 0x0
Forbidden DS Attribute Mask : 0x0
Required US Attribute Mask : 0x0
Forbidden US Attribute Mask : 0x0
Service Type ID :
Service Type ID in config file :
Ranging Class ID : 0x6
Active Classifiers : 0 (Max = NO LIMIT)
CM Upstream Filter Group : 0
CM Downstream Filter Group : 0
CPE Upstream Filter Group : 0
CPE Downstream Filter Group : 0
DSA/DSX messages : permit all
Voice Enabled : NO
DS Change Times : 0
Boolean Services : 2
Number of Multicast DSIDs Support : 16
MDF Capability Mode : 2
IGMP/MLD Version : IGMPv3
FCType10 Forwarding Support : Y
Features Bitmask : 0x0
Total Time Online : 29:19 (29:19 since last counter reset)
CM Initialization Reason : NO_PRIM_SF_USCHAN
CFG Max IPv6 CPE Prefix : 16 (-1 used)
Capabilities : {Frag=N, Concat=N, PHS=Y} - looks strange
cmts rebooted, changed the modem firmware to a newer one. Not help.
Any ideas?
Please supply
show cable modem 4432.c873.ebdc qos
show cable modem 4432.c873.ebdc qos
Sfid Dir Curr Sid Sched Prio MaxSusRate MaxBrst MinRsvRate Throughput
State Type
61 US act 27 BE 5 0 3044 0 0
62 DS act N/A N/A 5 0 3044 0 13
This is without us tweaks. I tried all the recommendations, but there were no changes. So I temporarily removed everything so as not to cause additional interference.
During this time, the MC5x20 was replaced and noise sources were eliminated. No result.
Started a replacement for the transition to 8x4.
show cable modem 4432.c873.ebdc verbose
MAC Address : 4432.c873.ebdc
IP Address : 172.16.2.112
IPv6 Address : ---
Dual IP : N
Prim Sid : 27
Host Interface : C6/1/2/UB
MD-DS-SG / MD-US-SG : 1 / 2
MD-CM-SG : 0x2F0102
Primary Wideband Channel ID : 97 (Wi1/3/0:0)
Primary Downstream : Mo1/3/0:7 (RfId : 79)
Wideband Capable : Y
RCP Index : 3
RCP ID : 00 10 00 10 08
Downstream Channel DCID RF Channel : 200 1/3/0:7
Downstream Channel DCID RF Channel : 193 1/3/0:0
Downstream Channel DCID RF Channel : 194 1/3/0:1
Downstream Channel DCID RF Channel : 195 1/3/0:2
Downstream Channel DCID RF Channel : 196 1/3/0:3
Downstream Channel DCID RF Channel : 197 1/3/0:4
Downstream Channel DCID RF Channel : 198 1/3/0:5
Downstream Channel DCID RF Channel : 199 1/3/0:6
Extended Upstream Transmit Power : 0dB
Multi-Transmit Channel Mode : Y
Number of US in UBG : 2
Upstream Channel : US3 US4
Ranging Status : sta sta
Upstream SNR (dB) : 28.32 28.32
Received Power (dBmV) : 0.50 -0.50
Reported Transmit Power (dBmV) : 49.00 49.00
Peak Transmit Power (dBmV) : 54.00 54.00
Phy Max Power (dBmV) : 54.00 54.00
Minimum Transmit Power (dBmV) : 20.00 20.00
Timing Offset (97.6 ns): 1124 1124
Initial Timing Offset : 1124 1124
Rng Timing Adj Moving Avg(0.381 ns): 256 0
Rng Timing Adj Lt Moving Avg : 35 0
Rng Timing Adj Minimum : -256 0
Rng Timing Adj Maximum : 65792 256
Pre-EQ Good : 1472 11666
Pre-EQ Scaled : 62 2177
Pre-EQ Impulse : 0 376
Pre-EQ Direct Loads : 0 33
Good Codewords rx : 299428 250036
Corrected Codewords rx : 1683 9515
Uncorrectable Codewords rx : 9 25184
Phy Operating Mode : atdma* atdma*
sysDescr : Technicolor Cable Voice and Wireless Gateway <>
Downstream Power : 5.90 dBmV (SNR = 39.90 dB)
MAC Version : DOC3.0
QoS Provisioned Mode : DOC1.1
Enable DOCSIS2.0 Mode : Y
Modem Status : {Modem= w-online(pt), Security=assign(tek)}
Capabilities : {Frag=N, Concat=N, PHS=Y}
Security Capabilities : {Priv=BPI+, EAE=Y, Key_len=56,128}
L2VPN Capabilities : {L2VPN=N, eSAFE=N}
Sid/Said Limit : {Max US Sids=16, Max DS Saids=15}
Optional Filtering Support : {802.1P=N, 802.1Q=N, DUT=N}
Transmit Equalizer Support : {Taps/Symbol= 1, Num of Taps= 24}
Number of CPE : 1(Max CPE = 5)
Number of CPE IPs : 1(Max CPE IPs = 16)
CFG Max-CPE : 5
Flaps : 7(Aug 30 19:14:33)
Errors : 0 CRCs, 0 HCSes
Stn Mtn Failures : 0 aborts, 6 exhausted
Total US Flows : 1(1 active)
Total DS Flows : 1(1 active)
Total US Data : 260140 packets, 90444865 bytes
Total US Throughput : 0 bits/sec, 0 packets/sec
Total DS Data : 2179180 packets, 2984588994 bytes
Total DS Throughput : 51 bits/sec, 0 packets/sec
LB group ID assigned (index) : 2150564098 (44812)
LB group ID in config file (index) : N/A (N/A)
LB policy ID : 0
LB policy ID in config file : 0
LB priority : 0
Tag :
Required DS Attribute Mask : 0x0
Forbidden DS Attribute Mask : 0x0
Required US Attribute Mask : 0x0
Forbidden US Attribute Mask : 0x0
Service Type ID :
Service Type ID in config file :
Ranging Class ID : 0x6
Active Classifiers : 0 (Max = NO LIMIT)
CM Upstream Filter Group : 0
CM Downstream Filter Group : 0
CPE Upstream Filter Group : 0
CPE Downstream Filter Group : 0
DSA/DSX messages : permit all
Voice Enabled : NO
DS Change Times : 0
Boolean Services : 2
Number of Multicast DSIDs Support : 16
MDF Capability Mode : 2
IGMP/MLD Version : IGMPv3
FCType10 Forwarding Support : Y
Features Bitmask : 0x0
Total Time Online : 16h55m (16h55m since last counter reset)
CM Initialization Reason : POWER_ON
CFG Max IPv6 CPE Prefix : 16 (-1 used)
I wanted to see if the tweaks had been applied properly
Did you reboot the test modem after applying the CM config file burst tweaks?
US tweaks will give you more speed per modem, but it will increase the network response time. I experimented with tweak many years ago, there were a lot of complaints from gamers.
I have the impression that the old US scheduler is working at 8x2.
We found an amplifier in the network. After replacing it, the speed was restored in the entire segment. The instruments showed no interference in the US from this amplifier. Until understand.
S/N did not increase after replacement.
Now 8x2 gives 100x20 Mbit/s. (3,2 MHz).
But since we had to check the entire coaxial segment, we decided to upgrade it to 8x4.
Thank you for your help and advice.
I think it's just an electronic attenuator.
In my case, the optical transmitter has a gain of 20 (not adjustable) and a gain of 20 in the optical receiver (adjustable, set to -20). In my opinion, this is an extra boost. But i can't disable it.
I can set an additional attenuator -20, but power-level gives the same result, but much more convenient.
In the case of power-level 15, there is an additional combiner for the 8x4 configuration (5x20, two US per connector).
Am I right?
node -> receiver -> splitters -> cmts upstream cable
Not sure this is correct
Does the receiver chip in the CMTS enjoy being blasted by carrier at +20?
And the noise floor will also be hitting the chip 20 dB higher than usual.
That is a lot of input power. Most likely this is out of spec, overloading the chip.
I think it would be better to make the coarse adjustment with eg 20 dB attenuator, and then you can make any fine adjustments using the power-level setting
20 db attenuator will be more reliable.