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Cisco ICM Enterprise Edition SS7 Gateway Configuration Tool User Guide Release 6.0(0)
Chapter 1 Introduction
Terminology
• Message Transfer Part 2 (MTP2). Provides link-layer functionality with
such capabilities as error-checking, flow control, and sequence checking.
• Message Transfer Part 3 (MTP3). Extends the functionality of MTP2 to
provide network layer functionality with such capabilities as node
addressing, routing, alternate routing, and congestion control.
• Network Interface Controller (NIC). A process within the ICM system that
communicates directly with the carrier’s signaling network. The NIC reads
call routing requests from the network and transfers them to the ICM’s
Central Controller. Subsequently, the NIC passes a routing label from the
Central Controller to the carrier signaling network.
• Point Code (PC). Numeric value that defines the unique ID of an element in
an SS7 network
• Remote Point Code (RPC). Identifies the signaling point where all links in
a linkset are directly connected.
• Signaling Connection Control Part (SCCP). SCCP provides two major
functions:
–
Addresses applications within a signaling point.
–
Performs incremental routing using a capability called Global Title
Translation (GTT), which frees originating signaling points from the
burden of having to know every potential destination to which they might
have to route a message.
• Service Control Point (SCP). Node (computer) in the carrier signaling
network. ICM software functions as a SCP in networks where the SS7Cfg
configuration tool is used.
• Signaling Link Code (SLC). Defines and numbers the links used in a linkset.
• Signaling System 7 (SS7). A standard network interface used by carriers to
interconnect switches and some peripherals.
• Service Switching Point (SSP). End-switching office in an Intelligent
Network (IN).
• Signal Transfer Point (STP). Routing and interconnection point for SS7
traffic.
• Transaction Capabilities Application Part (TCAP). Defines the messages
and protocol used to communicate between applications (deployed as
subsystems) in nodes.