name: SSCF
full_form: Service Specific Co-ordination Function
context: The Multi-Protocol Label Switching (MPLS) protocol is an interstitial, layer 2.5 protocol which complements and enhances the IP protocol, in that it offers an alternative method of forwarding IP packets, while reusing the existing IP routing protocols (e.g., OSPF, BGP). MPLS can run on top of numerous L2 technologies (PPP/Sonet, Ethernet, ATM, FR, WDM Lambdas, etc.). MPLS forwards IP packets based on a 20-bit label. An ingress router at the edge of an MPLS domain, called a Label Edge Router, decides which subset of incoming packets is to be mapped to which Label-Switched Path (LSP), and then adds the corresponding label to each packet as it arrives. This subset of packets that is forwarded in the same manner over the same LSP is called a Forwarding Equivalence Class (FEC). Packets are then forwarded through the MPLS domain by the Label Switched Routers (LSRs) based on the label. At the egress edge of the MLS domain, the egress LSR removes the MPLS label from each IP packet, and
description: The Service Specific Co-ordination Function (SSCF) is a sub-layer within the SAAL-NNI that maps the requirements of the layer above to the requirements of SSCOP, enabling service-specific co-ordination and communication between network elements.
explanation: Based on its role in mapping requirements, facilitating service-specific coordination, and interacting with other network components like SSCOP and AAL5, the SSCF clearly functions as a Network Function within the telecommunications architecture.
section_title: 5.2.2	ATM Transport Option
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