Dialogic DSI SS7MD manual Glossary

Dialogic® DSI SS7MD Programmer’s Manual Issue 3

Glossary

AAL5	ATM Adaptive Layer part 5
AIS	Alarm Indication Signal (Blue alarm).
ATM	Asynchronous Transfer Mode
config.txt	A text file used for protocol configuration.
ctu	An example program that demonstrates how a user application can interface with
	telephony user parts, such as ISUP and TUP.
DPC	Destination Point Code. Identifies the address (point code) of the SS7 network node to
	which a Message Signal Unit (MSU) should be directed.
DSI	Distributed Signaling Interface
gctload	A program that handles the initialization sequence and creates inter-process
	communication.
HSL	High Speed Link conforming to the Q.703 Annex A specification.
IMA	Inverse Multiplexed ATM
INAP	Intelligent Network Application Part. An SS7 stack layer that defines the messages and
	protocol used to communicate between applications (deployed as subsystems) in SS7
	nodes. INAP uses the Transaction Capabilities Part (TCAP). See TCAP below.
IS41	An ANSI signaling standard used in mobile networks.
ISUP	ISDN User Part. A SS7 stack layer that defines the messages and protocol used in the
	establishment and tear down of voice and data calls over the public switched network,
	and to manage the trunk network on which they rely.
Link	A physical and logical connection between two signaling points.
Linkset	One or more signaling links that are connected to adjacent signaling points.
LIU	Line Interface Unit.
LFM	Linear Feet per Meter.
LSL	Low Speed Link conforming to the specification in Q.703.
MAP	Mobile Application Part (MAP). An SS7 stack layer supporting messages sent between
	mobile switches and databases to support user authentication, equipment identification,
	and roaming.
MSU	Message Signal Unit. A data unit that carries signaling information for call control,
	transaction processing, network management and maintenance. Typically, the MSU is
	carried in the Signaling Information Field (SIF) of SS7 messages.
MTP	Message Transfer Part. Layers 1 to 3 of the SS7 protocol stack broadly equivalent to the
	Physical, Data Link and Network layers in the OSI protocol stack. See also MTP1, MTP2,
	and MTP3.
MTP1	Message Transfer Part Level 1. An SS7 stack layer that defines the physical and electrical
	characteristics of the signaling links of the SS7 network. Signaling links use DS0
	channels and carry raw signaling data at a rate of 48, 56 or 64 kbps.
MTP2	Message Transfer Part Level 2. An SS7 stack layer that provides link-layer functionality.
	Ensures that two end points of a signaling link can reliably exchange signaling messages.
	It provides error checking, flow control and sequence checking.
MTP3	Message Transfer Part Level 3. An SS7 stack layer that provides network-layer
	functionality. Ensures that messages can be delivered between signaling points across
	the SS7 network regardless of whether the signaling points are directly connected. It
	provides node addressing, routing, alternate routing and congestion control.
mtpsl	An example utility that can also be used to activate and deactivate signaling links.

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