ISDN and SS7

3 Day Course
Code PWL061

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Scheduled Online Onsite


This is a technical course designed for engineers who are experienced in signalling and ISDN. The course starts looking at signalling systems in general, with the wide number of protocols and systems in uses, in particular their interface with SS7 (Signalling System No. 7) and ISDN (Integrated Services Digital Network). It looks in details at Signalling System No. 7 (SS7) and its wide deployment within modern telecom network. This course looks in detail at the SS7 protocol stack, the main components of the SS7 network and the Signal Units. The ISDN section looks in details at ISDN at various levels – Data link layer and Physical layer and also at the architecture of the ISDN network.


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Introduction To Signalling

User-Network Signalling (2 topics)

  • Analogue types
  • ISDN

Network- Network Signalling (2 topics)

  • Analogue types
  • SS7

User-User Signalling (2 topics)

  • In ISDN
  • Q.Sig and DPNSS

Signalling types CAS and CCS (8 topics)

  • Identifying the 2 main categories of signalling systems:
  • Channel Associated Signalling (CAS)
  • State-based signalling
  • R2
  • Common Channel Signalling (CCS)
  • Message-based signalling
  • SS7
  • CCS and CAS Comparison

HDLC – The frame for telecommunications (10 topics)

  • Data link control
  • Framing
  • Addressing
  • Control
  • Error checking
  • Use of HDLC
  • SS7
  • V5.1 and V5.2
  • Others (LAPB, LAPF, LAPM and LAPD+)

Others (LAPB, LAPF, LAPM and LAPD+) (13 topics)

  • ITU-T Signalling System No. 7 and how it works
  • Associated and quasi associated mode
  • Examining parts of SS7
  • MTP
  • TUP
  • ISUP
  • SCCP
  • TC (and TCAP)
  • Proprietary parts
  • Signalling units of SS7
  • MSU
  • LSSU
  • FISU

Signalling Systems and ISDN (9 topics)

  • ISDN Services
  • Bearer Services
  • Teleservices
  • Supplementary Services
  • ISDN Channel Allocation
  • Basic Access
  • Primary Rate Access (PRA)
  • ISDN Signalling
  • Q.921 and Q.931

Signalling System No. 7

Standards and Recommendations (4 topics)

  • Standards bodies
  • ITU-T recommendations
  • ETSI standards
  • ANSI standards

Signalling Links and Signalling Points (10 topics)

  • What is a signalling point in a SS7 network?
  • The three different types of SS7 signalling points
  • The signalling transfer point (STP)
  • The service switching point (SSP)
  • The service control point (SCP)
  • Mated pair configurations in the SS7 network
  • What is a signalling link?
  • The different types of SS7 signalling links and how each is used
  • Understanding how signalling link selection (SLS) works
  • Point codes and global titles

The SS7 Protocol Stack (4 topics)

  • The open systems interconnection (OSI) reference model
  • The SS7 protocol stack and how it relates to the OSI model
  • Identifying the different components of the SS7 protocol stack

Message Transfer Part (MTP) (5 topics)

  • What is the MTP?
  • What functions does the MTP perform in a SS7 network?
  • Examining the functionality of the three layers of the MTP
  • The addressing systems used at the MTP levels
  • The signalling point code

The Signalling Connection Control Part (SCCP) (6 topics)

  • What is the SCCP?
  • How the SCCP supplements the functions of the MTP
  • How the SCCP is used to interconnect at a global level
  • Examining the structure of an SCCP message
  • Understanding how the SCCP handles global titles
  • How does global title translation work?

Transaction Capabilities (TC) (4 topics)

  • What is TC and TCAP and what is it used for in a SS7 network?
  • Examining the two layers of the TCAP
  • Examining the functions of the component sub-layer
  • Examining the functions of the transaction sub-layer

TUP and ISUP (7 topics)

  • What are the functions of the top layers - the user parts?
  • Examining the different user parts and understanding how they work
  • Telephone user part (TUP)
  • ISDN user part (ISUP)
  • Identifying the basic ISUP message format
  • Examining the basic ISUP call control messages
  • Tracing the ISUP messages used for a basic voice call

Signal Units (17 topics)

  • What are SS7 signal units?
  • The components of SS7 signal units
  • Octets, flags and the frame check sum
  • The length indicator bit, the backward indicator bit and the forward indicator bit
  • The backward and forward sequence number (BSN/FSN)
  • The 3 different types of signal units
  • Examining the fill in signalling unit (FISU)
  • Examining the frame layout of a FISU
  • The capabilities of the link status signalling unit (LSSU)
  • Examining the frame layout of a LSSU
  • The status field
  • Examining the applications of the message signalling unit (MSU)
  • Examining the frame layout of a MSU
  • The service information octet (SIO)
  • The signalling information field (SIF)
  • Understanding how a routing label is attached to the MSU
  • National point codes


Standards and Recommendations (5 topics)

  • ITU-T recommendations
  • ETSI standards
  • NETS and CTRs
  • ANSI standards
  • APIs

Architecture, protocols & systems configuration (8 topics)

  • Network Interfaces and channel structure
  • User-Network Interface Configuration
  • How important are the ISDN Architectural Reference Points?
  • R, S, T, U, V, NT1, NT2, TE1, TE2 and TA
  • Interface types and Channels - The ISDN Transmission Structure
  • Primary Rate Access (PRA)
  • PRA B Channels
  • PRA D Channels

ISDN at the Physical Layer (4 topics)

  • Reviewing what happens at the Physical Layer - identifying the models, functionality, and interfaces:
  • Primary Rate Access User-Network Interface
  • USA 1.544 Mbit/s Interface
  • Europe 2.048 Mbit/s Interface

ISDN at the Data Link Layer

Getting to grips with the HDLC procedure (13 topics)

  • How does the HDLC procedure work (High Level Data Link Control)?
  • Identifying the data link models, functions and services
  • Point to point protocol
  • Layer 2 frame formats
  • I-Frames
  • Supervisory frames
  • Un-numbered frames
  • Link Access Procedure using D Channel (LAPD)
  • What are the characteristics of LAPD?
  • Examining the structure of the LAPD Frame
  • Traffic management at the Data Link Layer
  • Flow control
  • Error detection and recovery

ISDN Call Control (10 topics)

  • What happens at Layer 3?
  • Protocols and functions
  • Protocol formats
  • What is Basic Call Control and how does it work?
  • Terminal types
  • Messages - organisation and types
  • Messages - organisation and types
  • Access Connection
  • Packet-Mode connection control
  • Control of supplementary services

Additional Material (4 topics)

  • Error messages in SS7 and ISDN
  • Protocol start up in SS7 and ISDN
  • SS7 trace analysis and examples
  • ISDN trace analysis and examples

Scheduled Dates

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Different pricing structures are available including special offers. These include early bird, late availability, multi-place, corporate volume and self-funding rates. Please arrange a discussion with a training advisor to discover your most cost effective option.

Code Location Duration Price Apr May Jun Jul Aug Sep

(Classroom or Online)
3 Days $2,085

What Our Customers Say

The training was delivered with a high level of expertise and excellence. Instructor was highly knowledgeable.”

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Excellent course, informative and well-paced.”

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Course was very well outlined. Topics were great and bridged many gaps.”

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