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loadsharing between 2 linksets

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ss7sos
loadsharing between 2 linksets

Hi,
Can anyone plz tell me whether it is possible to do load sharing between 2 linksets, each linkset having 16 links.

Thanks
ss7sos

Edited by: admin on 05/16/2010 - 04:32
Opteamal
Re: loadsharing between 2 linksets

Hi ss7sos,

If you have a look into the ITU standard Q.704 ?2.2.4.
You will find that, into the MTP3 routing label there is a parameter called "SLS", which is used by the system in order to perform linkset loadsharing.

Cheers.
Opteamal.fr

Parasa
Re: loadsharing between 2 linksets

SLC is for loadsharing among links in a linkset. Check out for combined link set concept.

alpork
Re: loadsharing between 2 linksets

Hi ss7sos

It id possible to make loadsharing between two Linksets. You should use parameter  DPC in system.His name in my system is "Loadsharing Key". The value depend on SLS in MTP level.
If you have DPC and 2 Linksets, you use SLS =1 (0001), 2 (0010), 4(0100) ...
If you have DPC and 4 Linksets, you use SLS =3 (0011), 5 (0101), 9(1001) ....

For Loadsharing between links in Linkset you use SLS too.
If you have 1 link in Linkset sls=0
If you have 2 links in linkset sls=1,2,4... You need "1" in one position
If you have 4 links in linkset sls=3,5 .... You need "1" in two position
If you have 8 links in linkset ..... You need "1" in three position

SLC is Signalling Link Code. SLC is very impotent for active link. Both side (exchange) should use the same SLC.
One link in linkset SLC =0(0000).
Two links in linkset SLC = 0(0000),1(0001).
Sixteen links in linkset SLC = 0,1,2(0010)...15(1111)
SLC isn't influence on loadsharing.

Regrets
Alpork

Robert
Re: loadsharing between 2 linksets

Hi everyone,
alpork but how the system decide which one of link in linkset or witch linkset going to DPC to choice. If I have two linksets and two signalling link in every linkset, my SLS in DPC and SLS in linkset is set to 1 (0001), witch linkset and signalling link will be choose?
Sorry for my English, I am from Poland.

alpork
Re: loadsharing between 2 linksets

Hi Robert

The system (exchange EWDS, Stand alone - His700, 5ESS or other) decides automatically.
You don't set SLS in linkset and DPC. You set special paramtes on linkset or DPC in exchange which use SLS for decide which ways (linksets) use or which links use in linkset. Value SLS is set automatically because SLS is parametr messages IAM, UDT or other.
I analyse you example DPC have 2 ways Linkset1 and Linkset2 and Linkset1/2 have two links. We set on DPC/Linkset special parametr (name depend on system) which decide which ways use linkset1 or linkset2 and which links use in linknset.
We recieve for example IAM for our His700-stand alone. Our system check what we set on DPC and if we use load share ( two ways for DPC) choose automatically way linkset1 or linkset2. SLS = XXX1 (Linkset1) or XXX0(linkset2) X=0,1. Value X isn't influence how system decide, important is only one bit. We have the same action for two links in the Linkset.

Regrets Alpork

RussCrush
Re: loadsharing between 2 linksets

There are some restrictions built in to certain devices that will not allow more than 2 linksets to any destination. In Tekelec STPs, the system will not take more than 3 routes (2 B-Links, 1 C-Link) to any DPC destination.

Robert
Re: loadsharing between 2 linksets

I know EWSD and SSNC (hiS700) and this system decide  which link in linkset to choose, on  the basic of last four significant bits of CIC, simply SLS and this four bits are equal, then SLS and parameter in LINKSET called "Load share algorithm" decide which signalink link in linkset to choose. I think the same is taken to select linkset to DPC

Difference in SLS and SLC

Hi Friends can you tell me what is the Difference in SLS and SLC.

sangamesh
sangamesh's picture
SLS is Signalling Link

SLS is Signalling Link Selector it is an identifier used for load sharing across linksets and links,Messages generated by MTP3 replace the SLS field with the Signaling Link Code (SLC). SLS value is of 4 bits in ITU-T and 8 bits in ANSI.

Sangamesh R H
Telecom Consultant

Difference in SLS and SLC

Thanks Sangamesh..please tell me more about below:-
But Why MTP3 Replace SLS with SLC. Why not SLS is used as it is ? What SLC does after Replacement. What is Need for SLC.

sangamesh
sangamesh's picture
SLS together with OPC and DPC

SLS together with OPC and DPC forms the Routing Label for MTP3 Linksets, SLC or SLS Code is used as a code reference among the links in linksets, ANSI networks use bit rotation the original SLS code is right bit-shifted before the message is transmitted onto the link. The bit rotation occurs at each node, before the message is transmitted.

Sangamesh R H
Telecom Consultant

Difference in SLS and SLC

Hi Sangamesh....
I am not able to understand the sentence "ANSI networks use bit rotation the original SLS code is right bit-shifted before the message is transmitted onto the link. The bit rotation occurs at each node, before the message is transmitted.".
Please explain or give me documents if any.. I am still doubts in what is the Difference in SLS and SLC.

sangamesh
sangamesh's picture
Bit rotation is the mechanism

Bit rotation is the mechanism of calculating the SLS value for the MSU. The SLC is a physical link reference number from 0-15 among 16 links and SLS is a calculation done based on the incoming MSU type or outgoing MSU.

refer this link http://www.informit.com/library/content.aspx?b=Signaling_System_No_7&seq...

Sangamesh R H
Telecom Consultant