mystiky2
join:2009-01-05
Brooklyn, NY | Is FIOS "dedicated" like DSL or "shared"?
I currently have DSL and am considering in going to FIOS. One of the reasons why I preffer DSL over Cable is that I have a dedicated speed & line, which is not influenced by others.
Does FIOS work like DSL or like Cable? |
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druber
join:2000-04-11
Marlborough, MA | Like DSL. |
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mystiky2
join:2009-01-05
Brooklyn, NY | Thanks. That's good to know! This way, I wont be affected by others, I guess? |
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druber
join:2000-04-11
Marlborough, MA
1 edit | Well, it isn't 100% guaranteed bandwidth. If you search here, you will find more detailed explanations, but the gist is that while you are sharing BW with other people, it shouldn't be as oversold as cable nodes often are. |
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Zero
join:2009-07-01
Collegeville, PA
| reply to mystiky2
FiOS is not dedicated and is shared like cable.
»Verizon Online FiOS FAQ »What is BPON or GPON?
BPON splits the fiber between a max of 32 users. GPON splits it up to 64 users. Verizon does splits at a max of 32 users. I believe Verizon will also do small splits of 8 or 16 as well.
Unlike cable with its typically overcrowded cable nodes, the fiber splits are not overloaded and oversubscribed giving customers their full speeds 24/7. |
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mikepd
Discovery
Premium,MVM
join:2000-10-26
New Port Richey, FL
clubs:
 ·Verizon FIOS
 ·Verizon Online DSL
 ·RoadRunner Cable
| reply to mystiky2
There is no such thing as a dedicated residential circuit. As already explained, FIOS shares the bandwidth differently than cable to the benefit of the subscriber and everything gets shared once it leaves Verizon's network.
--
Always Reach Beyond Your Grasp |
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cdru
Go Colts
Premium,MVM
join:2003-05-14
Fort Wayne, IN
| reply to mystiky2
DSL is dedicated between the consumer to the central office, but after that it's shared with other users.
Cable is shared between others. It can range between a few and hundreds. It's up to the cable company to manage the node sizes and split them when appropriate. They often can be oversubscribed at the node to the point of slow downs during prime times, but not always.
FiOS is kind of split between the two. Each fiber node can be split for up to 32 (BPON) or 64 (GPON) customers. The bandwidth for that fiber is only split between those customers and has a much lower subscriber:bandwidth ratio. If not all customers for a given node subscribe, it's likely there is actually unused bandwidth available on that node. However, at the other end of that fiber it gets combined with all the other nodes in the neighborhood and other neighborhoods just like cable and DSL. |
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mod_wastrel
join:2008-03-28 | So, in the "old" lingo... DSL is a star config (customer -> CO), cable is a ring config (customer -> node), and FiOS is a star config for both the customer to the node and each node to the CO. Sound right? |
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cdru
Go Colts
Premium,MVM
join:2003-05-14
Fort Wayne, IN
| said by mod_wastrel  :So, in the "old" lingo... DSL is a star config (customer -> CO) Yes
said by mod_wastrel :cable is a ring config (customer -> node) Not a ring technically. Bus would be more appropriate.
said by mod_wastrel :FiOS is a star config for both the customer to the node and each node to the CO. Sound right? FiOS also technically would be a bus between the ONT (customer premesis) and the OLT (other end of the fiber). The bus would actually look more like a tree, but it's essentially all shared bandwidth on a common line. Once at the OLT it gets aggregated with other OLTs and ties into backbones.
The OLT controls all the downstream traffic marking it with which OLT should allow the packets to pass through to a customer's network. Bandwidth is not split evenly between all customers. If you are not using all your bandwidth you are provisioned for, but your neighbor is plus he wants to watch a HD VOD, the OLT just allocates more of the packets to him (up to a point).
In the opposite direction, the OLT can't control directly packets coming to it since it's many to one. Instead, it uses some type of a multiple access protocol, such as Time Division Multiple Access (TDMA) that gives each ONT a specific block of time to send traffic before it has to wait for it's turn again. |
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