internet and bandwidth?

Question

when the internet/applications etc leave's my companies building does it actually travel through 1 cable to the ISP or through 10 t1 lines?

2.how fast are the packers moving, dont they crash through 1 cable

3. dont cables have like 3 cables inside, 1 for internet, 1 for video and 1 for etc ?


i hope i make sense, thanks

Answer 1

Regarding the first question, this will all depend on how much bandwidth the company has agreed to pay and what type of ISP infrastructure is available in the area, such as microwave (wireless), satellite, ATM or T1/T3. Yes, if the bandwidth required exceeds that of a T1 @1.54Mb/s, multiple T1s can be bundled to equal a fractional T3. A T3 has the capacity @ 45 Mb/s and regardless of the prefix, both ride on the same dedicated physical cable. T3s are commonly subdivided and leased as fractional T3s or as multple T1s. It is the equipment provided by the ISP that throttles the available bandwidth to thier clients. Another example would be Cable Internet, which a group of houses may share the same physical link for CATV, Telphone and Internet access.

The speed between some links can handle an aggregate load exceeding 10 Gb/s and they are currently experimenting with 100Gb/s. When data is sent, packets do crash here and there, but there are rules in place to reduce this. The two most common practices are collision avoidance and collision detection. Collision Avoidance systems either require the sender to have a special ticket to send or before sending ask for clearance to send. It will then wait until it receives the special ticket or receives a clear to send response. Collision Detection systems first check the line for activity before sending. They do not wait for a clearance response, but listen for the line to clear. Some times it isn't clear when they send and this causes a collision. When this happens, both ends will back off for a random amount of time before resending.

Lastly, it is physically possible to have one cable dedicated for each type of traffic, but not always practical. There are many cases where all three ride on the same cable. Common examples used are Cable and DSL. Both generally ride on the same wire that supplies a telephone or CATV service. You can also bundle audio, video and data on the same T1. All three examples do this by either different encoding or broadcast frequencies that do not interfere. This is called multiplexing and that is how a Cable or DSL modem work, they isolate the data signals from the rest.

Answer 2

The data travels through may different cables/equipment/routes- Ethernet cables and phone or cable lines, through routers and servers.

By the way. There are 8 wires (4 twisted pairs) inside a CAT5 Ethernet Cable.

Answer 3

depending on how your company designs their infrastructure and need for accessing date depends on what type of bandwidth will be needed via be CABLE, DSL, T-1, DS-3, ATM, FIBER, and MICROWAVE.

By the sounds of it your company has 10 T-1 lines which they may be using a DS3 Channelized T-1 meaning you have 28 channels of T-1 to connect to other sites from a centralized location.

Packers can move as fast as they can as long as Brett Fave still throws long balls.

Cables have a solid copper and multiple twinds of strands of smaller copper wire seperated by some core to send digital signals using wavelengths via a mixture of signals.

Answer 4

To the ISP? Probably only one; but segmented packets can travel by many different routes to reach their ultimate destination through the backbone lines.

Don't understand your #2.

One, I see one just one copper needle in my cable.