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www.iec.org/online/tutorials/ss7/topic06.html

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Posted by crouse

pls visit:
www.mobilein.com/ss7.htm -

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Posted by crouse

Being at different hierarchies, the local-to-long distance links would be considered D links. Links used for SS7 communication directly between SSPs (no STP ...more details
www.mobilein.com/ss7.htm - 29k -

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Posted by waqasahmad

interconnect mated STP pairs of one hierarchical level to mated STP pairs to another hierarchical level

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Posted by Hash007

For details:

www.pt.com/page/tutorials/ss7-tutorial

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Posted by sagitraz

STPs are always deployed in pairs, allowing a spare should one of the STPs have a problem. Each STP of a "mated pair" are connected to each other via Cross links (C links). STP pairs connect to other STP pairs via Bridge or Diagonal links (B or D links). B links connect STP pairs that are at the same level of hierarchy while D links connect STP pairs that are different hierarchial levels. An example would be STPs in a local network connecting with STPs of a long distance network. Being at different hierarchies, the local-to-long distance links would be considered D links.

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Posted by HamidAliKhan

Diagonal links connect mated STP pairs at one hierarchical level to mated STPs at another hierarchical level. They are deployed in the same fashion as B links

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Posted by Kuan-yin