Talk:Signaling System 7
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[edit] Updating Ss7stack
I think the SS7 stack could do with being updated to show TUP as one of the L4 protocols and then cross-reference this to the TUP article. I guess this is controlled by the inclusion of the reference to "SS7stack" within two pairs of curly brackets. I can't work out how to edit this. Any pointers as to how I go about editing this would be appreciated. --AndyAicken 13:09, 7 November 2006 (UTC)
The "Stack" is also very misleading. For instance ISUP is not dependant on SCCP as a transport layer, only MTP levels 2 & 3 are used. Same would be true of TUP. The stack is also inaccurate in one important respect. There is no such thing as MTP Level 1. Level 1 is the physical layer, it is not part of the MTP as no "messages" are transported. 217.36.0.13 14:40, 26 March 2007 (UTC)
- Quote from Q.701:
- "The functions of each level of the MTP are performed by means of the level protocol between two systems which provides a “level service” to the upper levels (i.e. level 1 Signalling Data Link, level 2 Signalling Link and level 3 Signalling network) as described in Recommendations Q.702, Q.703 and Q.704 respectively."
- MTP level 1 is the Signalling Data Link. 195.10.3.194 16:59, 26 March 2007 (UTC)
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- OK, the {{SSstack}} template is now in that section (although it's also, I just noticed after editing the section on its own, at the top of the article... damn), and I've reworded the whole MTP1-3, SCCP, TCAP, TUP/ISUP part. I can't, off hand, think of any users of SCCP other than TCAP, although I'm not sure if the BSSAP is a TCAP user on top of SCCP, or uses SCCP in connection mode directly. Also, I've sort of hinted at the fact the TCAP article is misnamed - TCAP doesn't stand for Transaction Capabilities Application Part - never has, never will. It's Transaction Capabilities, as clearly evidenced by the titles of the Q.77x series of standards. 86.144.170.33 21:33, 26 March 2007 (UTC)
[edit] fuzzy part
I'm having trouble understanding the part of the text that starts with:
Here are some of the GSM/UMTS CS interfaces in the MSC transported over SS7: B -> VLR (uses MAP/B). Most MSCs are associated with a VLR, making the B interface "internal". D -> HLR (uses MAP/D) for attaching to the CS network and location update E -> MSC (uses MAP/E) for inter-MSC handover
suddenly there the text changes style completely. Maybe som explanation in the article would help...
--Vic242 17:36, 9 October 2006 (UTC)
[edit] Re: SS7 vs. C7
It is my understanding that SS7 relates to the ANSI standard while C7 relates to the ITU standard. Although with many things in common they are diferent in for example things as the addressing space.
[edit] Re: SS7 vs. C7
I believe SS7 and C7 to be synonyms. Often you will also find CCS7 for "Common Channel Signaling (System) 7". But yes, there are certain subtle differences wrt. e.g. lenghts of certain protocol fields such as CIC.
[edit] Re: SS7 vs. C7
Yes, SS7, C7 in common nomanclature references the signaling network.
There is no mention of the links or entities that create the SS7 network, IE: SSP, STP, SCP
Now with respect to the links themselves: 'A' Links = Access Links 'B' Links = Bridge Links 'C' Links = Cross Links 'D' Links = Diagonal Links 'E' Links = Extended Links 'F' Links = Fully associated Links
Now; there is also the database functionality that gets associated to the SCP. Also it should be noted that SS7 is a seperate network; and functions as an over lay to the PSTN. Ahh; this article will grow with time. Regards, Pete
[edit] C7 vs SS7
I've always thought of C7 as denoting the European standard, with the C standing for CCITT; similarly, I've seen J7 (Japanese variant), and A7 (ANSI variant).
Also, while I'm here, I'd say CAMEL should have a link off the main page.
[edit] Adding a link to the 'Products' section
Looking at the links on the 'Products' section I think this link to Aculab's SS7 offering would not be out of place: http://www.aculab.com/products/ss7.htm IANCEE 11:01, 2 October 2006 (UTC)
I've also added a link to Squire Technologies SS7 products: http://www.squire-technologies.co.uk/products/index.html. --AndyAicken 13:09, 7 November 2006 (UTC)
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- The number of links in the "Products" section appears to be getting excessive per WP:NOT#REPOSITORY and WP:NOT#DIRECTORY. -- Rob.au 09:21, 7 March 2007 (UTC)
[edit] Historical Inaccuracies
SS7 is relatively new nomenclature for what has historically always been known as C7, first under the CCITT then ITU/ETSI banners. When I first started working in the Telecommunications industry back in 1988 there was no mention of SS7 anywhere in any literature. Even when communicating with engineers in the USA the terminology used was always C7. There was no such signalling system as SS6, it has always been called C6 and it's not appropriate to retrospectively rename it to "fit in" with the new naming convention of SS7. The C naming convention has nothing to do with the ANSI or CCITT/ITU/ETSI variations of the signalling system, it relates to the fact that it is a Common Channel Signalling (CCS) system as opposed to a Channel Associated Signalling (CAS) system.
- The ITU calls it SS#6 (see ITU-T standards page). So, appropriate I guess it is. 195.10.3.194 17:10, 26 March 2007 (UTC)
