OID noise margin cisco 878

Hello
What is the OID of the noise margin for the cisco 878?
I have found in the MIB of router the parameter hdsl2ShdslEndpointCurrSnrMgn but the snmpwalk query does not match the show controller dsl 0!
Any ideas?
PD:
# show controllers dsl 0
Transmit Power: 13.5 dB
Receiver Gain: 14.420 dB
SNR Sampling: 34.2500 dB
hdsl2ShdslEndpointCurrSnrMgn
1.3.6.1.2.1.10.48.1.5.1.2
snmpwalk -c public -v 1 host 1.3.6.1.2.1.10.48.1.5.1.2
SNMPv2-SMI::transmission.48.1.5.1.2.14.1.2.1 = INTEGER: 0
SNMPv2-SMI::transmission.48.1.5.1.2.14.2.1.1 = INTEGER: 12
Sorry for my english.
Thank you!

Thank you for your question. This community is for Cisco Small Business products and your question is in reference to a Cisco Elite/Classic product. Please post your question in the Cisco NetPro forums located here:
http://forum.cisco.com/eforum/servlet/NetProf;jsessionid=E0EEC3D9CB4E5165ED16933737822748.SJ3A?page=Network_Infrastructure_discussion This forum has subject matter experts on Cisco Elite/Classic products that may be able to answer your question.
THANKS

Similar Messages

Question about Noise Margin and Line Attenuation a...

1.       For several years I have had a BT telephone line. From the utilities provided by http://www.kitz.co.uk/adsl I find that I am connected to the Exchange at Merton Park (BT Code: LSMEPK) Distance:-   Direct:   960 metres (appx)* By Road: 1.29 km. Exchange Status ADSL enabled: March 30, 2000 DSL Max enabled:   March 30, 2006 SDSL enabled : Enabled 21CN due : (PSTN) N/A 21CN WBC (Broadband)   Enabled 15.02.09
2.       I previously had broadband from UKOnline and used a Speedtouch 570 adsl modem. I was paying £9.99 for a speed of 1MBit/s – in practice 700K – which was fine for most purposes but BBC iplayer did struggle a bit. UkOnline has been taken over by SKY so I switched to BT Total Broadband Option 3 in mid December, and initially used the Speedtouch 570 as there were delivery delays on BT Home Hub 2.0 due to weather conditions. Speed was initially very good but did not measure it.
3.       After Xmas I set up the BT Home Hub and ran a speed test - the profile was 2.5MBit/s. I was disappointed to get less than 3Mbit/s which is needed for BBC iplayer HD.
ADSL line status
Connection information
Line state Connected
Connection time 0 days, 2:26:57 ------> 6th January 2011
Downstream 2,268 Kbps
Upstream 440 Kbps
ADSL settings
VPI/VCI 0/38
Type PPPoA
Modulation ITU-T G.992.5 ---à this apparently means ADSL2+
Latency type Interleaved
Noise margin (Down/Up) 15.7 dB / 31.9 dB
Line attenuation (Down/Up) 27.0 dB / 9.7 dB
Output power (Down/Up) 0.0 dBm / 12.7 dBm
Loss of Framing (Local) 22
Loss of Signal (Local) 3
Loss of Power (Local) 0
FEC Errors (Down/Up) 6512 / 0
CRC Errors (Down/Up) 0 / 2147480000
HEC Errors (Down/Up) nil / 0
Error Seconds (Local) 2
4.       As part of the “slow speed wizard” I looked into getting the accelerator plate for my NTE5 split face master socket available for postage only (£1.20) but the web form advised me that if I proceeded with this order the broadband contract would automatically be extended by 12 months. I checked my BT internet account and was surprised to find an email (23rd Dec 2010) advising me that as an Option *1* customer I was in danger of exceeding my usage allowance – which surprised me as I am definitely Option 3. I wondered if I had had the speed throttled. Therefore phoned BT accounts who said the email was a mistake - I am Option 3, also said that accelerator plate was unlikely to make a difference.
5.       I contacted the BT call centre who talked me through various options. Plugging the hub direct into the master socket made no difference. They also ran a line test and said the line was fine.
6.       I therefore browsed the community care forum and find that disappointing speeds are not uncommon. One of the threads mentioned disconnecting the bell wire on the extensions. I follow this advice and removed line 3 on all extensions and then checked the ADSL status on the hub.
ADSL line status
Connection information
Line state Connected
Connection time 0 days, 6:33:45 10th January 2011
Downstream 2,272 Kbps
Upstream 888 Kbps
ADSL settings
VPI/VCI 0/38
Type PPPoA
Modulation ITU-T G.992.5
Latency type Interleaved
Noise margin (Down/Up) 31.8 dB / 14.4 dB
Line attenuation (Down/Up) 27.0 dB / 9.7 dB
Output power (Down/Up) 0.0 dBm / 12.3 dBm
Loss of Framing (Local) 0
Loss of Signal (Local) 0
Loss of Power (Local) 0
FEC Errors (Down/Up) 0 / 0
CRC Errors (Down/Up) 0 / 2147480000
HEC Errors (Down/Up) nil / 0
Error Seconds (Local) 0
7.       This had a dramatic improvement on Upstream speed – and a big change to the noise margin Noise margin which had been (Down/Up) 15.7 dB / 31.9 dB and is now Noise margin (Down/Up) 31.8 dB / 14.4 dB. It did not improve the download speed.
8.       In the following days the BT hub has not been particularly stable with some intermittent loss of wireless connectivity every few hours. Examining the event log I was a bit disconcerted to see alterations to firewall settings had happened (which I hadn’t made) and resets which I am pretty certain I hadn’t made – and a userid login with a name like TR69. Perhaps these are occasioned by the BT speedtester? To be fair I had reset and powered off the hub a number of times in attempt to sort out this problems.
9.       I have switched to a Netgear DG83GT (V1.03.23) for the time being until I have what I can regard as a reasonably fast stabile connection. At the time of writing this has been stable for 20 hours DownStream Connection Speed 2268 kbps UpStream Connection Speed 888 kbps.As stated earlier I would like downstream to be faster.
The perceived wisdom on the forum seems to be that several days of complete stability are required if there is to be any improvement on speed.
10.   If a moderator or anyone with the relevant experience reads this I would be very grateful for answers to the follow questions:
A.      Is the change in the Noise Margin parameter a good thing or a bad thing?
B.      Are the line attenuation figures acceptable for a distance of under 1.5kilometres to the exchange?
C.      Should I be able in theory to get a faster speed i.e. downstream 3Mbit/s?
D.      From the forum it seems to take several days for speed adjustments to be effected or to take effect – is this a technical issue or a policy issue?
Many thanks.
Robert
Solved!
Go to Solution.

Good Morning - it is now 6 days since this posting. During this time there have been 2 resets of the adsl line
Fri, 2011-01-14 03:28:43 - LCP down.
Fri, 2011-01-14 03:28:54 - Initialize LCP.
Fri, 2011-01-14 03:28:54 - LCP is allowed to come up.
Fri, 2011-01-14 03:28:54 - CHAP authentication success
and
Sun, 2011-01-16 16:37:26 - LCP down.
Sun, 2011-01-16 16:37:36 - Initialize LCP.
Sun, 2011-01-16 16:37:36 - LCP is allowed to come up.
Sun, 2011-01-16 16:37:36 - CHAP authentication success
These were not initiated by me - and since noise margins and sync speeds changed as a consequence can I assume that this is evidence of the adaptive process working?
Secondly, as you can see, the noise ratio has vastly improved as have the upstream and downstream sync speeds
        System Up Time 157:54:52
      ADSL Link          Downstream          Upstream
      Connection Speed           11199 kbps           1091 kbps
      Line Attenuation           27.0 db           9.9 db
      Noise Margin           14.8 db           9.2 db
BUT from the BT speedtester, as shown below I seem to be stuck in a banded IP profile of 1750/1091 which is very different from the downstream sync speeds of 11199 Kbps(DOWN-STREAM)
Can BT staff take action to alter this? If they can how do I contact them?
Regards,
Robert
18th Jan 2010
Download Speed    1288 Kbps
0 Kbps   2000 Kbps
Max Achievable Speed
Download speedachieved during the test was - 1288 Kbps
For your connection, the acceptable range of speedsis 800-2000 Kbps.
Additional Information:
Your DSL Connection Rate :11199 Kbps(DOWN-STREAM), 1091 Kbps(UP-STREAM)
IP Profile for your line is - 1750 Kbps
The throughput of Best Efforts (BE) classes achieved during the test is - 2.28:10.77:87.0 (SBE:NBEBE)
These figures represent the ratio while sententiously passing Sub BE, Normal BE and Priority BE marked traffic.
The results of this test will vary depending on the way your ISP has decided to use these traffic classes.
2. Upstream Test: -provides background information.
Upload Speed       896 Kbps
0 Kbps   1091 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 896 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 1091 Kbps

New phone line and broadband, massive noise margin...

Hi, being a long time DSL stalwart a recent move to a new property has meant I've needed to switch over to ADSL instead and thus far it's proving to be a bit of a mare!
I waited a month for the initial installation engineer who promptly never showed anyway, no bother I thought, the hub turned up and I installed it myself and it promptly didn't work It soon became pretty apparent that the phone line was completely dead even from the test socket. A few phone calls later and the phone line is working much to my delight. The broadband is another story though, initially it still couldn't connect but later in the day it managed to get going. However it's excruciatingly slow with an average of 20 to 30kps throughput and substantial packetloss. Also worth noting is that in this new property, only the master socket actually works, this place has 4 other sockets dotted around all of which appear to be dead, could these be part of the issue? Does using the test socket completely cut these out and rule out bad wiring? Just to add, at 13 hours connected the adsl status is pretty much the same and I couldn't notice anything on the BT line noise test number.
I'm not familar with the workings on ADSL lines but I'm guessing the root of the problem is down to a wildly varying noise margin both up and down. Down fluctuates between ~2 and 20 within a matter of seconds and up gives some numbers that defy belief. Now the line was originally activated on Wednesday, actually kicked into life sometime on Friday and the router has been connected for 13 hours now, whilst it's still early days and things should bed in more, I assume I'm right in thinking I should be alarmed at how bad a line I'm starting out with? And should I be directing my ire at the builders or BT?
Any help and suggestions will be hugely appreciated!
Cheers!
Solved!
Go to Solution.

as it is a newbuild is the master socket inside your home or outside like this
connecting to the test socket will eliminate all your extension sockets and should be your best connection. if you are not in the test socket could you try it and post new stats please
with your attenuation I would expect a connection speed of about 18mb when you get this fiixed
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If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

Please can I have my Noise Margin lowered *again*

Message sent to StephanieG, who was very helpful last time.
Please can I have my noise margin lowered back down to 6 again?
Although it is plugged 24/7 into the test socket, it has crept up again over the last 6 weeks, until another disconnect 10 minutes ago.
Maybe BT would consider, in future HH firmware updates, allowing users to negotiate their own SNR margin, without having to go through this forum?
Cheers,
Tim
ADSL line status
Connection information
Line state
Connected
Connection time
0 days, 0:04:13
Downstream
5,920 Kbps
Upstream
448 Kbps
ADSL settings
VPI/VCI
0/38
Type
PPPoA
Modulation
ITU-T G.992.1
Latency type
Fast
Noise margin (Down/Up)
14.2 dB / 27.0 dB
Line attenuation (Down/Up)
27.0 dB / 17.5 dB
Output power (Down/Up)
19.8 dBm / 12.4 dBm

I think it is unlikely that BT will ever update the HH to allow users to change their noise margin as it would give them even more support issues. If you wish to continue with a latency type of FAST then I suggest you invest in a router that allows you to specify the noise margin. This thread mentions 1 such router - http://community.bt.com/t5/BB-in-Home/Last-chance-saloon-really-Absolutely-fed-up/td-p/77569

Cisco 878

Hello everybody,
I would like to learn more about Cicso hardware, and the best way is to try and play with the hardware.
I have a Cisco 878 router, we used this router for an Internet Access connection.
I think the best way is to reset the router to it's default factory settings and upgrade the firmware before I start setting up the device.
I have an Ip-address, but telnet and ssh are not possible.
So I have a few questions, and I hope you guys can help me with this:
a. how can I reset the router?
b. how can I flash the firmware?
c. how can I setup the Cisco Router?
I would like to use the router for the following purpose: VLAN routing with two 3COM Layer 2 switches.
And I would like to setup the Cicso Router to get an IP address from my Cable Modem through ethernet, is this possible?
Because I know this model is for an symmetrical High-Data-Rate DSL (G.SHDSL) (4-wire), 4-port managed switch!!!
Configuration on the switches:
- LinkAggregation: Port 25:
- VLAN1 - Port 1 (managed)
- VLAN10 - Port 2-11 untagged, AL1 tagged
- VLAN11 - Port 12-24 untagged, AL1 tagged
The switches are connected from port 25 on switch 1 and port 25 on switch 2, the devices on VLAN10 Switch 1 can communicate with the devices on VLAN 10 on Switch 2, but routing between VLAN10 and VLAN11 is not possible.
So I would like to use the Cicso Router for the routing between the VLANS, is this possible?
If yes, is it possible to configure which traffic is possible between VLAN10 and VLAN11?
For clients it must be possible to connect to devices in VLAN10 and VLAN11 and Internet.
IP configuration:
VLAN1: 192.168.100.0/24
VLAN10: 192.168.1.0/24
VLAN11: 192.168.2.0/24
Client in VLAN 10 while have a static IP-address or while have an IP-addreess through DHCP, can DHCP be done by the Cisco Router?
I hope you guys have a good picture, and I hope to get some answers to get started.
Kind regards,
Martin.

Hello everybody,
I would like to learn more about Cicso hardware, and the best way is to try and play with the hardware.
I have a Cisco 878 router, we used this router for an Internet Access connection.
I think the best way is to reset the router to it's default factory settings and upgrade the firmware before I start setting up the device.
I have an Ip-address, but telnet and ssh are not possible.
So I have a few questions, and I hope you guys can help me with this:
a. how can I reset the router?
b. how can I flash the firmware?
c. how can I setup the Cisco Router?
I would like to use the router for the following purpose: VLAN routing with two 3COM Layer 2 switches.
And I would like to setup the Cicso Router to get an IP address from my Cable Modem through ethernet, is this possible?
Because I know this model is for an symmetrical High-Data-Rate DSL (G.SHDSL) (4-wire), 4-port managed switch!!!
Configuration on the switches:
- LinkAggregation: Port 25:
- VLAN1 - Port 1 (managed)
- VLAN10 - Port 2-11 untagged, AL1 tagged
- VLAN11 - Port 12-24 untagged, AL1 tagged
The switches are connected from port 25 on switch 1 and port 25 on switch 2, the devices on VLAN10 Switch 1 can communicate with the devices on VLAN 10 on Switch 2, but routing between VLAN10 and VLAN11 is not possible.
So I would like to use the Cicso Router for the routing between the VLANS, is this possible?
If yes, is it possible to configure which traffic is possible between VLAN10 and VLAN11?
For clients it must be possible to connect to devices in VLAN10 and VLAN11 and Internet.
IP configuration:
VLAN1: 192.168.100.0/24
VLAN10: 192.168.1.0/24
VLAN11: 192.168.2.0/24
Client in VLAN 10 while have a static IP-address or while have an IP-addreess through DHCP, can DHCP be done by the Cisco Router?
I hope you guys have a good picture, and I hope to get some answers to get started.
Kind regards,
Martin.

How do I find noise margin etc?

Over the past few months my download speed has dropped from around 7M to around 3. Work has been going on since the start of the year to bring FTTC to the area and I assumed that this was to blame. But that work has now finished, although I personally am unable to get upgraded. I think it may now be a case of the Mods resetting my profile, but I can't seen to find the noise margin etc from my hub stats. I use HH4. Can somebody please help me with this?
Solved!
Go to Solution.

Sorry John & IMJolly, I'm not very good at this with my tablet, and have been unable to upload the results I have found, so I will attempt to type them in. Here goes.
Line stats
14.59.00, 24 Jun. (57.460000) DSL noise margin:5.90dB upstream 8.30dB downstream.
14.58.59, 24 Jun. (56.550000) DSL line rate 1084Kbps upstream 3072Kbps downstream
With regards the ADSL checker
Featured Products. Downstream. Upstream Range. Availability
WBC ADSL 2+ Up to 6. -- 4 to 8. Available
WBC ADSL2+Annex M. Up to 6. Up to1. 4 to 8. Available
ADSL MAX. Up to 5. -- 3.5 to 7.5. Available
WBC fixed rate. 2. -- -- Available
Fixed rate. 2. -- -- Available
Hope this is usable for you

Cisco 878 "priv" command password recovery in Rommon mode

Hi,
There was " Cookie information corrupt" error on cisco 878 and I enter cookie information with cookie command. The priv command password is "0000" when all cookies zero, but I inserted wrong cookies . I want to edit cookie information. The priv command password changed and I can't edit cookie informations.
How can I recovery priv command password in rommon ?
Thanks for help,

Hi friends,
I solved problem. You must add the first five numbers in 16-bit hex in cookies :
Sample :
00
01
+
00
30
+
85
d7
+
e0
60
+
0a
ff
= 17167
The password is only four characters, so remove the most significant bit and the password is 7167.

Difference between noise margin and noisy line

Hi
This issue has always bugged me. Am transferring to BT Infinity next week from Sky and have mixed feelings. We live a fair way from the exchange so line attenuation is a problem but we mange to get 3.5-4Mb with absolutely zero outage using the Sky unlimited package. Our current router stats are posted below and I woud be grateful for your interpration of the noise margin figs. Is the 7db download commensurate with a quite and stable connection that bodes well for Infinity? I'm curious cos our phone line is noisy with much background niose despite the fact that we don't have any fancy gadgets and use filters just about everywhere.
I'd just like your views on noise on the line versus noise margin for broadband and how each might impact on Infinity when we're connected next week.
Many thanks for your time.
Router StatisticsSystem Up Time: 05:44:16
Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
WANPPPoA
403055
369851
0
14261
13203
05:42:39
LAN100M/Full
370239
415781
0
13527
14890
05:44:11
WLAN11M/54M
8864
0
0
150
0
05:43:58
ADSL Link Downstream Upstream
Connection Speed4093 kbps
796 kbps
Line Attenuation51 db
28 db
Noise Margin4 db
14 db

Enter your attenuation here http://www.kitz.co.uk/adsl/max_speed_calc.php
Results are approximate
If any post helps tick the star box on the left
Just cause Im paranoid dont mean they are not out to get me

High Noise Margin

Hi there,
It seems like my line has been changed to a different profile with the Downlink Noise Margin Target being set to 10dB.
I'd like to have it back to 6dB as before. I've lost over 0.6Mbps and my speeds weren't exactly that high to begin with!
Many thanks!
1. Product Name: HomeHub4
3. Firmware version: v0.07.01.0910-BT (Type B) Last updated 21/1/2015
4. Board version: 01A
5. DSL uptime: 3 days, 09:19:23
6. Data Rate: 711 / 2203
7. Maximum Data Rate: 724 / 2404
8. Noise Margin: 5.5 / 10.3
9. Line Attenuation: 35.0 / 51.5
10. Signal Attenuation: 34.9 / 55.8
11. Data sent/received: 192.8 MB / 3.9 GB
13. BT Wi-fi: No
14. 2.4GHz wireless network/SSID: BTHub4-Z6FQ
15. 2.4GHz wireless connections: Enabled (802.11 b/g/n (up to 144 Mb/s))
16. 2.4GHz wireless security: WPA & WPA2 (Recommended)
17. 2.4GHz wireless channel: Automatic (Smart Wireless)
18. 5GHz wireless network/SSID: BTHub4-Z6FQ
19. 5GHz wireless connections: Enabled (802.11 n (up to 300 Mb/s))
20. 5GHz wireless security: WPA2 Only
21. 5GHz wireless channel: Automatic (Smart Wireless)
22. Firewall: Default
23. MAC Address: 18:
24. VPI/VCI: 0/38
25. Modulation: G.992.3(ADSL2)
26. Latency type: Fast
27. Software variant: -
28. Boot loader: 0.4.3-BT (Mon Jun 9 14:23:56 2014)

Hi HaoForNow,
Thanks for posting and welcome back!
Sorry for the connection problems you were having with your broadband. Great to see everything has been stable over the last 3 days. I'll help reset the profile to reduce the noise margin and push your connection speed in the right direction ^^^
Click on my username and under the "about me" section of my profile you'll see the link to send us your details.
Cheers,
Robbie
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry that we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

Cisco 878 router for ADSL connectivity

Hi All,
I got a Cisco 878-k9 G.SHDSL router. I am trying to configure to get connectivity to my Service Provider.
Earlier i have configured Cisco 877 router serval times. But Cisco 878 for the first time. There is a DSL
controller in 878 rtr. I think i m missing something somewhere.
Below is the config that i have done
controller DSL 0
mode atm
loopback digital
dsl-mode shdsl symmetric annex A
line-rate auto
line-term cpe
line-mode 2-wire line-one
ip cef
ip dhcp excluded-address 192.168.10.1 192.168.10.10
ip dhcp pool INSIDE-Pool
   import all
   network 192.168.10.0 255.255.255.0
   default-router 192.168.10.1
   dns-server 212.77.192.59 212.77.192.60
   lease 8
interface ATM0
description (Outside Public Interface)
no shutdown
no ip address
load-interval 30
no atm ilmi-keepalive
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 1
interface Dialer0
ip address negotiated
no ip redirects
no ip proxy-arp
no ip unreachables
ip nat outside
ip virtual-reassembly
encapsulation ppp
ip route-cache flow
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap callin
ppp chap hostname p4411XXXX
ppp chap password qatarXXXX
ppp pap sent-username p44114032 password 0 qatarXXXX
no sh
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
ip nat inside source list 101 interface Dialer0 overload
access-list 1 permit any
access-list 101 deny ip 192.168.0.0 0.0.255.255 10.10.0.0 0.0.255.255
access-list 101 permit ip 192.168.0.0 0.0.255.255 any
dialer-list 1 protocol ip permit

i have an adsl line
i try to configure the router 878
but no connection ,, kann u tel me how do u have resolve the probleme please
this is the running config
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname cisco2
boot-start-marker
boot-end-marker
no logging buffered
aaa new-model
aaa authentication login default local
aaa authorization exec default local
aaa session-id common
resource policy
clock timezone EST -5
clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
ip subnet-zero
ip cef
ip name-server 212.217.0.1
ip name-server 212.217.0.12
ip name-server 212.217.1.1
ip ddns update method sdm_ddns1
DDNS both
vpdn enable
vpdn-group pppoe
crypto pki trustpoint TP-self-signed-201735762
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-201735762
revocation-check none
rsakeypair TP-self-signed-201735762
crypto pki certificate chain TP-self-signed-201735762
certificate self-signed 01
3082023D 308201A6 A0030201 02020101 300D0609 2A864886 F70D0101 04050030
30312E30 2C060355 04031325 494F532D 53656C66 2D536967 6E65642D 43657274
69666963 6174652D 32303137 33353736 32301E17 0D303230 33303130 32353235
375A170D 32303031 30313030 30303030 5A303031 2E302C06 03550403 1325494F
532D5365 6C662D53 69676E65 642D4365 72746966 69636174 652D3230 31373335
37363230 819F300D 06092A86 4886F70D 01010105 0003818D 00308189 02818100
A62304BC 27194971 2A4FAEB3 9D57240E 26EDED2A 1674FF9A 7CBBB8F2 85245C3B
C4DDBBF8 F8A67D31 5FDCBD11 72A2735D 9E8FC84B 17B55C71 43C10E41 ACC50BEC
FCE8D9EE 6D2B0B55 9BD5B62C 3981506F 04B92C25 CA4C307E BC6A6A5F 4FBEF0EE
05FEFA57 C7D879FD 79EF442F 121D6393 57E96F31 5414D1D5 4FADFBC0 95C9EAB3
02030100 01A36730 65300F06 03551D13 0101FF04 05300301 01FF3012 0603551D
11040B30 09820763 6973636F 322E301F 0603551D 23041830 16801418 6C8FED13
FFD7B2FB F6FA47E7 682B0093 FAE2AC30 1D060355 1D0E0416 0414186C 8FED13FF
D7B2FBF6 FA47E768 2B0093FA E2AC300D 06092A86 4886F70D 01010405 00038181
007C867C AC28A7F0 4BDD261C 81A71F1D E0671C28 F4724F5D ED1FE702 BCE234D9
1F85FE90 4D0AD23E 9904CBF9 D44A8CD5 0F5515BB 8FEEE4BB FF9795E1 7770B60A
E37455CC D6606EAF E0EAEEA4 932F55E6 91C6F87F 1D022203 08AD7C78 4DCF5AEA
819D2367 2B5054CC 695A4EF5 BC9ADA26 F7803106 E94BD666 179EB3DF 4CDE4CB8 1C
quit
username xxxxx privilege 15 password 0 xxxxx
controller DSL 0
mode atm
line-term co
line-mode 4-wire standard
dsl-mode shdsl symmetric annex B
ignore-error-duration 15
line-rate 4608
interface BRI0
no ip address
encapsulation hdlc
shutdown
interface ATM0
no ip address
ip nat outside
ip virtual-reassembly
no atm ilmi-keepalive
interface ATM0.1 point-to-point
pvc 8/35
pppoe-client dial-pool-number 1
interface FastEthernet0
interface FastEthernet1
interface FastEthernet2
interface FastEthernet3
interface Vlan1
description lan
ip address 192.168.1.5 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly
ip route-cache flow
ip tcp adjust-mss 1412
interface Dialer1
ip ddns update hostname xxxx.dyndns.org
ip ddns update sdm_ddns1
ip address negotiated
ip mtu 1452
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap pap callin
ppp chap hostname xxxxx
ppp chap password 0 xxxxx
ppp pap sent-username xxxxx password 0 xxxxx
interface Dialer0
no ip address
ip classless
ip http server
ip http access-class 24
ip http authentication local
ip http secure-server
ip nat inside source list 1 interface Dialer0 overload
ip access-list extended to-sip-servers
remark --- traffic to any sip server
permit udp 192.168.1.0 0.0.0.255 any eq 5060
access-list 1 permit 0.0.0.0 255.255.255.0
access-list 1 permit 192.168.1.0 0.0.0.255
dialer-list 1 protocol ip permit
snmp-server community public RO
no cdp run
control-plane
banner motd ^CINE welcome
banner ^C
line con 0
no modem enable
line aux 0
line vty 0 4
password cisco
scheduler max-task-time 5000
end

Is my downstream noise margin too high?

As you can see from these stats I have an issue with speed at the moment. I have an engineer coming out tomorrow. Is there any direction I can point him in looking at these numbers.
1. Product name:
BT Home Hub
2. Serial number:
+068343+NQ35147172
3. Firmware version:
Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated 11/03/14
4. Board version:
BT Hub 5A
5. VDSL uptime:
0 days, 11:21:30
6. Data rate:
19999 / 32394
7. Maximum data rate:
21878 / 70147
8. Noise margin:
6.0 / 16.6
9. Line attenuation:
0.0 / 16.0
10. Signal attenuation:
0.0 / 16.0

DLM has capped ur rate.
you may have line problems.
there are some known issues with the HH5.
do you have a openreach modem ?

High noise margins

Hi all, (nearly) a first time poster and am having SERIOUS issues with BT Broadband.
I was with Sky for ages but migrated to BT, I had consistant and steady speeds with Sky of 4.5 to 5.5 mb.
I had a recent loss of connection (towards the end of my 10 day "settling" period) and the full connection went down soon after and 5 days later re-connected me, the line is noisy to the ear, BT have conducted tests and they say all is fine, I even hear the modem noise connecting if I'm on the phone.
I've checked all sockets, am using the master(there is no test socket in my box, there is no "bell" line connected). I'm on the Hartlepool exchange so don;t know if that has been recently upgraded to the 21CN, if so would this cause any of my problems??
I've have checked everything at my end that could cause excess noise, have removed phones, Sky+box etc.. and still a crappy connection, any ideas guys n gals?? Thanks
Stats below:
ADSL line status
Connection Information
Line state
Connected
Connection time
0 days, 00:00:31
Downstream
575 Kbps
Upstream
888 Kbps
ADSL Settings
VPI/VCI
0/38
Type
PPPoA
Modulation
G.992.3 Annex A
Latency type
Interleaved
Noise margin (Down/Up)
12.5 dB / 9.6 dB
Line attenuation (Down/Up)
49.1 dB / 27.8 dB
Output power (Down/Up)
4.4 dBm / 1.3 dBm
Loss of Framing (Local/Remote)
0 / 0
Loss of Signal (Local/Remote)
0 / 0
Loss of Power (Local/Remote)
0 / 0
FEC Errors (Down/Up)
0 / 0
CRC Errors (Down/Up)
0 / 32
HEC Errors (Down/Up)
0 / 0
Error Seconds (Local/Remote)
0 / 0

when you say the line is noisy have you tried the quiet line test preferably with a corded phone in master socket - dial 17070 and option 2 - you should hear nothing
your exchange has been upgraded to 21CN and you are currently on adsl2 with modulation of 992.3
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Can anyone help? High noise margin and low sync sp...

Hi all,
just registered on the forum so this is my first post. Hopefully someone out there can help.
I transferred my broadband to BT from Sky. With Sky my sync speed was around 4000kbps and download of about 3500kbps. I had a Netgear router with Sky but for some reason every day or so my sync speed dropped to 2500kbps and download down to 1800kbps. I had to reboot the router to get the speeds back up again, very frustrating.
I got BT broadband on 20/1/2010, set everything up and also fitted an I-plate. I noticed that line attenuation was 46db, this was previously 50.5 with sky and prior to I plate. The home hub sync was at 7200kbps at the start which i was very pleased with. I know this DLM thing is active for the first 10 days or so and speedtests during this time are not exactly accurate but still I was happy. after 3 days i did a speed test and got download of 5800kbps, chuffed to bits!
But, after 2 days at that speed the sync dropped to 2176kbps, gutted. I have only rebooted the router 3 times since the service started and each time the sync goes back to 7000kbps ish but drops again a day later. The thing I dont understand is the noise margin. Its currently at 24.5db, isnt that awfully high? Why is this? when I reboot it drops to 8-9db ish but then goes up again with the speed dropping.
currently connected to test socket, no other telephone equipment connected to any extensions
Can anyone please help/advise whats going on or how to rectify it? I'm wondering if theres a line fault somewhere.
And with attenuation at 46db I would have thought the speed could well be much higher than 2200kbps.
I'll stop babbling now,
Thanks

whitesp wrote:
Thanks for your reply Somerled,
ok so something is causing noise at a particular time, i had wondered about the quality of the home wiring, there are 4 extension sockets in the property, but again i am currently only connected to the test socket.
I dont have the old netgear router unfortunately so can't follow up on the suggestion you made.
God this is gonna be a nighmare to track down, although come to think of it I do have a dimmer on quite close to where the master socket is.
Can we say for sure that there definitely IS a source of noise/interference??
Many thanks
SOMETHING is forcing a resync, and at a low speed. The only thing that would cause that is a prolonged burst of noise.This is known to BT technicians as "REIN" (Repetitive Electrical Impulsive Noise). No point trying to get BT to investigate at this stage though, as it sounds very intermittent.
The way to spot radio interference noise is to use a suitable receiver - and the most convenient is a portable medium wave transistor radio. Tune to a quiet spot at the lowest end of the scale, and turn up the volume. All you'll hear is white noise and the occasional quiet crackle. A burst of noise strong enough to affect the DSL signal will be unmistakeable - a LOUD crackling/buzzing/rasping noise. If that coincides with a resync, you've found it. You then have to figure out what electrical device caused the noise.....
Another possible source of DSL noise problems is less obvious - noise caused by a line fault. This causes an unwanted mixing of the phone and DSL signal in a way that can't be corrected by the filters. This will have much the same effect as external interference noise.
Check this : does the router resync when the phone rings, or when the phone is in use ? If it does, then we're on to something - a fault known as an "HR" (High Resistance). If that doesn't happen, then we are back to external radio interference as the cause.
I suppose the HV lines you mention might have some effect, but it's a bit of a long shot. I'd expect noise from them would be a bit more constant, and would cause problems all the time, rather than intermittently.

Resetting the Noise Margin after Upgrade to 21CN

Hello,
A few weeks ago I requested the Noise Margin resetting when I was on ADSL Max - which worked a treat However, since then I've been upgraded to 21CN (see below) and the Noise Margin has jumped back up to an average of about 9db. The line has been 100% stable, but the Download speed has dropped slightly (although the Upload is a nice 1mb! ).
Please can someone post a link so I can contact the Mods again?
Thanks.

Here's a copy of the Stats so far.
FAQ
Test1 comprises of two tests
1. Best Effort Test: -provides background information.
Download Speed
4618 Kbps
0 Kbps
7150 Kbps
Max Achievable Speed
Download speedachieved during the test was - 4618 Kbps
For your connection, the acceptable range of speeds is 2000-7150 Kbps.
Additional Information:
Your DSL Connection Rate :5888 Kbps(DOWN-STREAM), 1187 Kbps(UP-STREAM)
IP Profile for your line is - 5000 Kbps
2. Upstream Test: -provides background information.
Upload Speed
981 Kbps
0 Kbps
1187 Kbps
Max Achievable Speed
>Upload speed achieved during the test was - 981 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 1187 Kbps

My noise margin was hard set, but it's not now.

Some of you will have seen me going on about low noise margins affecting download speeds recently, and that the way to fix it is to get BT to hard set the noise margin at 6dB to prevent the problem. I had to do this a while ago when I was first upgraded to 21CN, and it was fine for a while. Problem is it seems the issue has returned, so I guess it's no longer capped at 6dB any more. Just making this thread so that the moderators can try to deal with it directly, since it took 15 attempts to even get BT to do as I asked last time!
Solved!
Go to Solution.

Hi
I am sorry to see you are having problems with your BT Service
I suggest you contact the forum mods they should be able to get this problem sorted for you this is a link to them http://bt.custhelp.com/app/contact_email/c/4951
They normally reply by email or phone directly to you within 3 working days they will take personal ownership of your problem until resolved and will keep you informed of progress
They are a UK based BT specialist team who have a good record at getting problems solved
This is a customer to customer self help forum the only BT presence here are the forum moderators
If you want to say thanks for a helpful answer,please click on the Ratings star on the left-hand side If the reply answers your question then please mark as ’Mark as Accepted Solution’

OID noise margin cisco 878

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