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SLS Signalling Link Set

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The SLS (Signalling Link Set) is a concept used in telecommunications to describe a group of signalling links that are associated with each other for the purpose of carrying signaling traffic between network elements. The SLS is typically used in the context of SS7 (Signaling System No. 7), a widely used protocol suite for telecommunications signaling.

Here is a detailed explanation of the SLS and its components:

  1. Signaling Links: Signaling links are physical or logical connections between network elements that are used to transmit signaling messages. These links can be implemented using various technologies such as T1/E1 lines, IP networks, or optical fibers. Signaling links carry signaling traffic between network elements, allowing them to exchange control information and coordinate their operations.
  2. Linkset: A linkset is a collection of signaling links that are grouped together for a specific purpose. Linksets are typically configured to provide redundancy and load balancing. In SS7 networks, linksets are often organized in pairs, where one link in the pair serves as the primary link, and the other serves as the backup or secondary link. This redundancy ensures the availability and reliability of signaling traffic in case of link failures.
  3. SLS: The SLS (Signaling Link Set) represents a group of signaling links that are associated with each other for signaling purposes. It defines the logical connectivity between signaling points (network elements) within a signaling network. Each signaling link within the SLS is assigned a unique SLS number, which is used to identify the link within the set.
  4. SLS Number: An SLS number is a numerical value assigned to each signaling link within an SLS. It is a locally significant identifier that is used to differentiate between different links within the same SLS. The SLS number ranges from 0 to 63 (in the case of SS7), allowing for up to 64 signaling links within an SLS.
  5. Signaling Point: A signaling point is a network element that participates in signaling activities within a telecommunications network. Examples of signaling points include switches, routers, signaling transfer points (STPs), and service control points (SCPs). Signaling points exchange signaling messages over signaling links to establish and manage voice calls, data sessions, and other telecommunications services.

In summary, an SLS (Signalling Link Set) is a group of signaling links associated with each other to carry signaling traffic between network elements. The SLS provides logical connectivity between signaling points within a network and helps ensure redundancy and reliability in signaling operations. Each signaling link within the SLS is assigned a unique SLS number to differentiate it from other links within the set.