Questions tagged [adsl]
For questions about the Asymmetric Digital Subscriber Line (ADSL) connection type. You should only use this tag in a professional enterprise purpose involving an ADSL connection.
50
questions
0
votes
1answer
31 views
How to combine multiple ADSL lines?
Before beginning, I'm totally new to advanced network topics and not working as a professional network engineer or so. Just trying to learn some stuff.
My problem is, I have 3 different ADSL (or VDSL)...
2
votes
1answer
150 views
ISDN and DSL comparison
From Wikipedia: "Integrated Services Digital Network (ISDN) is a set of communication standards", and for DSL: "Digital subscriber line is a family of technologies". My question is:
Is DSL built on ...
5
votes
1answer
184 views
Is it possible to set up a DSL lab environment?
I'm trying to figure out if I can setup a DSL lab for training purposes.
If I have a switch or laptop running a PPPOE server, could I go from ethernet-to-modem then connect the modem's WAN port to ...
1
vote
1answer
74 views
Pros and Cons of two different ISP connection Model
I have seen two different models to connect My Server to cloud.
Model 1:
DNS ------|
|---ISP_Router---Cloud----DSL Modem---Office_Router---Switch---My_Own_Web_Server
Google ------| ...
1
vote
2answers
68 views
Is the `twisted-pair` line transfer `digital data` and `ADSL` line transfer the `modulated electrical signal`?
From the WiKi:
Modem (modulator–demodulator) is a network hardware device that modulates one or more carrier wave signals to encode digital information for transmission and demodulates signals to ...
3
votes
1answer
98 views
VDSL2 Cross Talk
I'm a system administrator for a large seasonal resort. There are approximately 150 summer cottages there. All are currently served by a mix of ADSL and VDSL2 over twisted pair telcom feeder cables.
...
0
votes
2answers
282 views
How to avoid cable crosstalk?
I have 4 ADSL UTP cables.
How much distance do I need to leave between cables to avoid crosstalk?
3
votes
2answers
1k views
What are the reasons for ADSL to use ATM instead of Ethernet
I'm a newbie to networking and I wonder what are the reasons for ADSL to use ATM instead of Ethernet ?
7
votes
4answers
1k views
Why is the Ethernet Connection Symmetric?
I know that cable connection (DSL) is asymmetric, there is a certain bandwidth on the channel, and for a better user experience, they allocate a bigger portion to the downstream. I suppose Ethernet ...
2
votes
1answer
1k views
Best way to replace DSL cable by CAT6 cable
Best way to replace DSL cable by CAT6 cable, to decrease resistances and improve connection.
Use 1 pair only.
Connect every 2 pairs together.
Connect White wires together and Colored wires together.
...
3
votes
3answers
1k views
What exactly is the local loop?
It would be crazy to have two transmission lines per every subscriber run from the subscriber to the ISP, do ISPs use a multiplexer then?On a cable network everyone is on the same line so multiplexing ...
4
votes
2answers
1k views
does the DSL distance really add more latency
I've been using dsl internet for quite a while and having a ping from Algeria to France of about 90 ms , after trying to ping some locations in Algeria , i am getting about 50 ms, ping to my gateway ...
2
votes
1answer
3k views
Different SNR Margins for Downstream and Upstream
I'm currently using an ADSL connection. The SNR-Margin for the Downstream is usually around 6db for a Line-Attenuation of 54db. It's terrible and causes a lot of CRC errors. While, at the same time, ...
0
votes
1answer
126 views
Establishing ip network over intercom
I am in an intercom network with 2 telephones at 2 different places A and B.
If I pick up receiver at A and dial a certain number, the phone rings at B and I can speak.
I have ethernet based ...
8
votes
2answers
54k views
What is SNR Margin and Line Attenuation?
I'm currently using an adsl connection and last week an engineer from my ISP came and told me that my SNR margin and line attenuation is not good, and they need to replace the main telephone cable to ...
1
vote
1answer
332 views
Can a VDSL2 to Ethernet converter be used as a replacement for a bridging VDSL2 modem?
I've got my own network infrastructure already, but I'm tied to my ISPs modem which is a bit on the flaky side. The modem is in bridging mode, with the perimeter router behind it handling ...
0
votes
1answer
70 views
Would a pulse dial telephone affect ADSL reliability/speeds? [closed]
I have set up ADSL in a Spanish property that has a single pulse dial telephone. A DSL splitter has been used, and both the telephone and ADSL work. ADSL speed in this area is poor anyway, so its ...
1
vote
1answer
291 views
Why does a Spanish internet modem/router not require a DSL filter? [closed]
TL;DR - Why does an internet router in Spain not require a DSL filter?
I am trying to set up an ADSL router in Spain. After some trial and error (RTFM) I see that Spanish routers do not require a ...
2
votes
1answer
897 views
What's the meaning of “Tx Power” in DSL test?
I've reciently tested ADSL network. Alongside parameters that I'm familiar with their meaning (SNR marin, Line Attenuation etc.) I come across Tx Power. I tried to google it, but there was no clear ...
3
votes
1answer
631 views
What's the difference of TR-069 and Point-To-Point protocol?
I've read my ISP, Telecom uses a Point-to-Point regarding the ADSL networking over ATM nowadays (which is rarely used in my country, and it's non-commercial). My friend told me it actually uses TR-069,...
1
vote
2answers
96 views
Why Business Class router don't usually include ADSL?
I am shopping for a good VPN router to replace my terrible stock ADSL modem + router from my ISP, which need to be restarted 4 times a day. This is for my office use, which connected by around 17 ...
1
vote
2answers
345 views
ADSL connection with routed subnet
My ADSL provider is providing me with a routed subnet over ADSL.
I have two IP address ranges: the PPP range (to estabilish the PPP connection between the modem and the ISP) and what they call the ...
0
votes
2answers
181 views
Can squeezing an RJ11 cable affect network performance? [closed]
I have just bought one of these: Ultra High Speed ADSL Cable 5m to move my router from the hall into my living room.
Before and after I installed it I did a batch of speed tests. I was getting 75-80 ...
3
votes
5answers
742 views
Which kind of connection do i need for BGP peering?
If i would like to do a BGP peering with someone do i need to have a direct connection to him? Meaning that we are in the same segment?
If not, would i be able to do a peering with someone even if i ...
1
vote
3answers
1k views
How to make IPSec VPN tunnel to work from behind NAT on ADSL?
I want to establish a VPN tunnel with AWS using IPSec (Vyatta).
There is something that I was not able to figure out: How do I make it work without having to configure a static IP for the customer ...
3
votes
1answer
2k views
PPPoE interface doesn't use ARP
LAN border routers often use PPPoE protocol to communicate with ISPs and to access the Internet through ADSL.
This link provides an example of output of ifconfig about an interface using PPPoE (page ...
2
votes
2answers
3k views
Why are /30 subnet used for PPP connections?
Our telephone company has recently set us up a new ADSL connection.
It consists of a PPP link over ATM.
The connection comes with a public /30 subnet that we can use to our liking.
We used one of the ...
14
votes
3answers
9k views
Why use PPPoE and not use IP directly?
As far as I understand, PPPoE operates over ethernet, so for PPPoE to be usable you should already be able to send Ethernet frames to your ISP.
At that point, why use PPPoE at all? Why not just run ...
1
vote
2answers
140 views
How does DSL synchonization actually work?
I would like to know, how the synchonization of ADSL (Asymmetric Digital Subscriber Line) actually works, something a bridging DSL modem does, for example.
I could only find out very general things ...
1
vote
2answers
1k views
In Fiber Optic Telephone line, how light signals are converted to the voice signals? [closed]
I have been learning how internet data travels in different kind of Broadband access.
In case of telephone broadband, voice signals travels through the telephone line. At the user premise, the modem ...
2
votes
3answers
4k views
NAT Network setup with DSL modem and Mikrotik router [closed]
I have littel experience in this kind of setups, so please bear with me. I think the question is kind of basic.
I have to install a router in a LAN since I'll have to have it mandle a VPN tonnel ...
0
votes
1answer
728 views
TD-W8951ND: Can I use this modem as router only? [closed]
I am having a modem / router TD-W8951ND which works fine with ADSL cable (telephone cable). Since I am changing my broadband plan (they will be providing there own modem), I need to make wifi work ...
0
votes
1answer
47 views
what command line linux show computers that is connected to a modem? [closed]
Suppose that I connected to internet -- from ADSL modem or wireless -- is a command line for linux for PC not server or cisco switch that I can detect my partner (we have a modem 4 port LAN example) ...
1
vote
1answer
36 views
Bond ADSL+ line with Cable Modem line in one single router
I need two bond ADSL+ modem with cable modem router at the office so I don't have to switch the line everytime one of them is offline, is there any software/hardware that allows me to bond two ...
1
vote
1answer
51 views
DSL upload link breaks down. Where to look and not to look?
In a small office where I set up the network, we recently started to experience WAN problems on the (V)DSL line. Specifically, up to three times per day the upload link breaks down to almost zero ...
3
votes
3answers
3k views
Does Internet speed over cable depend on distance?
Perhaps the question I want to ask is not directly related to discussion subjects over here, but I couldn't find better place to ask.
I wanna know how does internet connection speed depend on ...
1
vote
1answer
61 views
Testing PPPoA using WICs
We've started deploying cisco routers in pairs (867VAE-K9 in particular) to offer office sites failover using ip sla and HSRP.
In testing I've been using 1841s and running the dialer over ethernet ...
0
votes
3answers
728 views
How to connect two different technologies in one LTE and DSL [closed]
In place where I'm living now, I have a poor internet connection. My download speed is not bad, but upload is poor. I have two broadband providers. First is DSL, or isdn I'm not sure, but I know one ...
9
votes
3answers
154 views
Why many of our WANs use fixed bandwith division between up- and downstream?
To multiplex upstream and downstream traffic typically frequency multiplexing or time multiplexing is used. E.g. an ADSL connection may use FDM and use 25kHz to 138kHz for upstream and 138kHz to ...
1
vote
1answer
65 views
Link ADSL modem together [closed]
Is it possible to connect two (not more) ADSL modem together by using RJ11 in a local environment (ie: in a lab) ?
+-------+ RJ45 +--------------+ RJ-11 +--------------+ RJ45 +-------+
| LAN 1 |...
2
votes
3answers
11k views
What causes packet loss when using full bandwidth from ISP?
We have a small, local ISP that is having some networking issues and I'm trying to understand the cause to better communicate with their network guys. I work with a number of companies with different ...
0
votes
2answers
2k views
How to configure WAN backup with 2 ADSL boxes and 1 router?
I've got 2 IP over ADSL boxes (Orange & OVH) and 1 TP-LINK router to manage the possible failover of one link.
When the Ethernet link between the primary box falls or when the bow itself is down, ...
2
votes
6answers
1k views
Leased lines vs. bonded DSL
first of all this is my first post on this forum however I got quite a lot of very helpful information from here in the past.
My company is operating in travel business and the at the moment we ...
2
votes
2answers
184 views
Simple question: Cisco 1750 AUX Port as “ADSL WIC”
I'm going to buy a Cisco 1750, but its lack the ADSL WIC Module. My question is, can I use the AUX Port to plug my RJ11 for DSL PPPoE Authentication? Like this:
Cisco 1750
ISP --- AUX -----...
4
votes
1answer
2k views
Cisco 877 ADSL Configuration
I'm a unix systems engineer and my network background is not so strong; I need a help to do the last touch-up to a cisco 877.
I've substituted our adsl router (a simple home router provided by the ...
1
vote
1answer
121 views
Will a network congestion occur if I use a single ADSL router connected to 24 port switch
I'm wondering how ADSL networks are implemented in an enterprise.
I have about 20 computers in my network which will be accessing the ADSL internet connection.
This is how my network will be :
...
4
votes
1answer
1k views
Will an ERICSSON T720G GPON ONU & a Linux box work as an upstream PPPoE BRAS in our demo setup?
I am a volunteer teacher trying to get my students fired up by learning Broadband. Accordingly I am building a small scale DSL/PPPoE Broadband network that they can touch, deconstruct and put back ...
8
votes
1answer
626 views
Is ADSL's UDP packet forwarding rate strictly linear to packet size?
Suppose an ADSL2 Annex A device had a upload speed of 300kbps; tested using a TCP connection. Now suppose I want to send 8-byte UDP keep-alive packets at the maximum possible rate*.
Would the ...
2
votes
2answers
8k views
Causes of low SNR
I am using a ADSL 2+ broadband service. My router shows very low SNR margin. While I quite understand what is SNR, I was curious to know what causes low SNR practically.
10
votes
1answer
5k views
PPPoA ADSL Configuration with external modem on Cisco 891
Context
We use Cisco 891 routers as CPE for several client sites. They are all running IOS 15.
Cisco IOS Software, C890 Software (C890-UNIVERSALK9-M), Version 15.0(1)M8, RELEASE SOFTWARE (fc1)
The ...
