Understanding Your Cable Modem
Have you been looking at your cable modem at home or at work and wondering to yourself how the whole thing works?
I hope so because I am going to talk about it all right now.
Or if you prefer, watch the short video below first before continuing reading.
Broadband services from cable providers or Multiple Service Dealer's (MSO's) are typically provided over cable modems as well as 90 % of the cable modems are actually using DOCSIS (Data over Cable Service Interface Spec).
Thus let's now look at what DOCSIS is actually as well as exactly what is actually methods. DOCSIS characterizes user interface demands for cable modems included in high-speed data distribution over cable process networks (meaning from cablelabs.com).
By having DOCSIS comes the different editions (1.0, 1.1, 2.0, & soon 3.0) and the restrictions for each version. We are not too concerned with the variations as well as restrictions between the versions as individuals because we merely desire speed and safety.
Yet the important feature regarding DOCSIS is actually that its is a standard that shields the customer and vendors by obliging interoperability and maintain the price of hardware down.
If the modems where proprietary at that point the consumers would need to pay an extremely high rate for the modem or might be actually capability to lease them from the MSO's. Most MSO's will definitely enable one to utilize practically virtually any cable modem whiches is DOCSIS certified.
Now not all MSO's will accomplish this because they've to support all the modems on the plant by having firmware upgrades as well as additional concern by having support however many of your well realized modems must be actually sustained.
Cable modems communicate by having an accessory termed a cable modem termination process (CMTS). The CMTS is a router that converses to all the cable modems and directions there traffic to the web or the MOS's backbone.
There are actually a few different sellers in the CMTS market yet the most recognized is Cisco Systems.
Cable modes are commonly grouped into regional nodes. A node is most likely the subdivision but could possibly however a reduced or lager area the MSO makes use of to sustain all one services.
The node is a fiber to RF converter which permits the MOS to send services to you location through fiber approximately the point of one local service area and them the services are actually delivered on top of coax.
The size of the node and number of modem clients in that node are able to make some distinction in the speeds of you modem. With cable modems the node is actually you regional accessibility place and the more customers the less data transfer obtainable for all.
Many MSO's over subscribe nodes however try to ensure there is consistently 50 % obtainable bandwidth at high point hrs.
Exactly what this means is that if you're in a heavily loaded node and each person is actually acquiring files you service can easily slow some.
By having exactly how economical the ISP company is actually most MSO's will seek to not over sign up nodes to much with out adding more nodes or splitting then.
Additional things to view out for is actually the security of the node.
Make sure additional clients in your node are not equipped to watch one home computer as well as its traffic.
This protection concern is generally handled by encryption on the modems traffic to the CMTS. Most ISP's usage BPI + encryption to guard you traffic but one really should constantly utilize an equipment firewall\/router off of virtually any broadband hookup. To test the protection of the node you can start the windows network sites as well as look to view if any undiagnosed pieces are actually detailed.
If there is actually no encryption in the node as well as you're on the identical subnet you might just be ready to understand additional user's network pieces.
This is actually poor if you've photoes or additional sensitive data one don't want others to view. Other features to realize are that most MSO's will definitely block ports to you are home computer network. This is for both there company objectives and the defense. MSO's generally block NetBIOS, SMTP, port 80, and a lot of other disease ports (establishment accounts might not get port filters).
The port blocking is actually done primarily to defend the consumers from viruses as well as worms that take a trip rapidly over broadband connections.
Let's now search at the signal degree should keep you are cable modem online as well as surfing.
Most cable modems offer a signal collection that they must communicate to the CMTS. The signal levels can differ from supplier to seller however as a direction of thumb most modems perform well from RX -10 dbv to +10 dbv as well as TX 40dbv to 56dbv.
A bunch of modem sellers provide an informative web page or diagnostic page you may connect also on the modem to see the messages from the modem as well as it'ses levels.
The diagnostic website's IP is actually diverse from modem to modem however if one lookup you are sellers modem standards you'll be ready to see if one modem needs this diagnostic website readily available.
Other features to maintain in your mind is that the cable modem really should be actually on it is own coax product line from the cable audit box outside or from the primary feed one receive from the MSO.
It's not a good idea to have you are modem on a coax line of products by having a ton of splitters due to each splitter offers at least 3.5 dbv or loss. As well as if you've to utilize a splitter ensure one read the throughput rankings on the splitter it really should be actually at least 5-1000 MHz pass though.
I trust that the above information has helped you better understand your cable modem.
If you require additional information then please take a look at this cable modem site.