Template talk:OSIstack
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[edit] DHCP
DHCP is listed as level 2. Shoudn't it be on a higher level. For instance level 7? 212.251.156.205 (talk) 20:39, 7 May 2011 (UTC)
[edit] SDH/Sonet
Hi there people,
I see the E1 and SONET/SDH are placed as layer 1 in the OSI model frame. My doubt is that E1 and SONET/SDH also treat the information at the logical level,for example, when processing CRC checks, analysing the time slot 16 (E1 PCM30) and many more in the case of the SONET/SDH. So, in my oppinion, these standards should have a secondary specification, as for example E1 PHY, or SONET PHY, to clarify about which part of the standard we are talking about. The CRC-4 feature, for example, is a feature related as layer 2. As stated in the artcicle "The Data Link Layer provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical Layer." This is an example of the physical and logical characteristics of these standards (E1 and SONET/SDH).
Cheers!
Carlos Jazbinsek (talk) 15:37, 8 February 2010 (UTC)
The CRC4 is a layer 1 feature. CRC4 doesn't transfer data between network entities; CRC4 appeared in order to avoid FAS simulation on PCM streams and improve quality supervision on the receiver end (no error correction, only detection). Data in time slot 16 is CRC16 checked. User's Access to ISDN layer 2 protocol (Q.921) use CRC16 error detection to ask retransmission (and thus "correct" error). Cardeña. — Preceding unsigned comment added by 2.137.21.214 (talk) 18:45, 22 November 2011 (UTC)
[edit] OSI and IP model are not the same
Dear all,
there is a huge misunderstanding of what the OSI model is. The article on the OSI actually represents this very clearly. Note that the OSI model is a structure that applies (fully or in parts) for any digital communication network. Fitting candidates are ISDN, SDH, ATM, Ethernet, RPR, IP, and so on.
IP lacks its own lower layers and therefore must use the network layer of some other network scheme to have transfer functions that are capable to get an IP packet from one router to the next. Commonly this is today Ethernet, but other were used and are still used as well (ISDN, SDH, ATM). For a clear view all protocols that are capable to provide an end-to-end connection passing some intermediate node (e.g. a cross-connect, a switch, a router, or something similar) should be placed at OSI Layer 3.
The OSI IP model defines a hierarchy of these network layers, and that is accidentally also refereed to as the OSI model, causing a lot of misunderstanding and confusion.
Therefore any figure showing other network protocol's acronyms never refers to the technology independent OSI model defined in ITU-T X.200.
85.127.103.152 (talk) 12:08, 24 May 2010 (UTC) by Sprawl.
- Sprawl seems to have a point here: This template does not describe the OSI model but the population of the OSI model with protocols from the TCP/IP protocol stack. I guess that is what he means by "OSI IP model". In any other context, IP, TCP, UDP, and so on, are not part of OSI in any way (not of its model, and not of its protocol stack), and the protocols that are part of its protocol stack, like IS-IS, ES-IS, TP2, RTSE, have somehow not made it into this template. --Pgallert (talk) 14:58, 17 January 2011 (UTC)
[edit] Where do we put this?
Some articles have put it at the top of the page. Others put it after the lead. I assume consistency is good. What's the best place? --Kvng (talk) 16:53, 4 July 2010 (UTC)
[edit] Layer 5 vs. Layer 7
There are huge misunderstandings in this graphic of what Layer 5 to 7 protocols are. The graphic shows protocols such as HTTP and SNMP at layer 7 when they are clearly layer 5 protocols. The corresponding layer 6 for these are HTML/XML for HTTP, and MIB (via OID's) for SNMP. The layer 7 is then your web browser or MIB browser. SIP is shown at layer 5 and 7 while it is clearly a layer 5 protocol. Some of the others like FTP and Telnet don't fit into this definition as they combine layers 5-7.
I agree with the previous poster, any figure showing any network protocol acronyms never refers to the technology independent OSI model defined in ITU-T X.200. —Preceding unsigned comment added by 174.26.249.198 (talk) 04:54, 25 July 2010 (UTC)
- Anon is right here. Anyone to else to discuss this? -- I do realise that previous attempts to put that straight have been reverted without discussion. --Pgallert (talk) 14:58, 17 January 2011 (UTC)
[edit] Why is the color Blue in the PHY layer?
Someone should fix the link to Blue or remove it.
[edit] SPDY should be Level 7
According to its wikipedia entry, SPDY is application-level ( http://en.wikipedia.org/wiki/SPDY ). Why is it at level 5? — Preceding unsigned comment added by 173.206.240.25 (talk) 22:38, 30 July 2011 (UTC)
- Corrected. -- Tomtefarbror (talk) 16:50, 28 August 2011 (UTC)
[edit] PPTP belongs to the data link layer
PPTP belongs to the "data link layer". You can find in this table OSI_model#Examples and in lots of places in internet. If nobody will object it, I will move PPTP to the data link layer in 7 days.--Sena (talk) 08:33, 15 September 2011 (UTC)
