DHS3 Release 1 System General Description
Chapter 1 Scope
A new range of Alcatel
PABXs will cover the market from 50 to 8000 users. This range is called DHS3x.
This range is covered by several system configurations called DHS 30, 32 and 34
depending on the capacity of the system.
The whole DHS 3x program
is split in two parts: one called release 0 which includes the DHS 30/32
configuration the other called release 1 which includes the DHS 34
configuration .This document describes the architecture and the services of the
DHS 30 / 32 systems which will cover the range between 50 and 800 users.
Sometimes in this document
we use the name DHS3 which is the generic name for DHS 30 and DHS 32.
Chapter 2 Terms and definitions
2.1. Standard acronyms and abbreviations
802.3 IEEE standard for
CSMA/CD access method.
802.5 IEEE standard for
Token ring access method.
802.6 IEEE standard for
MAN ( metropolitan area network) access method.
ACSE The Application
Control Service Element is an ASE that provides basic facilities for the
control of an application-association between two applications entities that
communicate by means of a presentation-connection.
AGENT PROCESS Agent
processes perform the management function upon receipt of directives specifying
management operations on managed objects.
API Application
Programming Interface. Set of primitives allowing an external application to
access the basic mechanisms of DHS3.
ASE Application Service Element is a coherent set
of services used for communication at the application layer level.
ASN.1 The Abstract Syntax
Notation one is a language for specifying protocol message formats.
CCR The Commitment of
Concurrence and Recovery is an ASE that supports atomic actions by providing
concurrence controls for commitment systems and recovery procedures.
CMIP Common Management
Information Protocol specifies a protocol which is used by application layer
entities to exchange management informations.
CMISE Common Management Information Service Element
is an ASE which may be used by an application process in a management
environment to exchange information and commands for the purpose of system
management.
CSTA Computer Supported
Telecommunications Applications is a standard which enhances the capabilities
of both computing and switching networks.
CLNP ConnectionLess
Network Protocol.
CLNS ConnectionLess
Network Service.
CONS Connection Oriented
Network Service.
CSMA/CD Carrier Sense
Multiple Access with Collision Detect.
DCE Data Circuit
terminating Equipment comprises such equipment as a modem. In an X25 context
the network access and packet switching modem is classed as DCE.
DTE Data Terminal
Equipment comprises user devices such as terminals and computers. The DTE
connects to the DCE which interfaces to the network and handles the
transmission and reception fo data.
DISA Direct In System
Access; feature which allows a public subscriber to access
PABX services after having
dialled a personal code
ETI Extended Terminal
Interface is an UNIX library allowing the screen management of ASCII terminals.
FDDI Fiber Distributed
Data Interface. Standard specifying a packet switched LAN to LAN backbone that
conveys data at high throughput rates over a variety of multimode fibers.
FTAM File Transfer, Access
and Management is an ASE which may be used by an application process for file
transfer.
FTP File Transfer
Protocol.FTP uses TCP services to control the exchange of files between two
hosts. FTP consists of both a server portion and a client portion. ASCII and binary
file transfers are supported. FTP also supports third party transfers where a
user establishes a FTP session on a local host to transfer a file between two
remote hosts.
I430/I431 Identical to
S0/S2.
I441/I451 Identical to
Q921/Q931.
IP Internet Protocol. The
Internet Protocol is designed for use in interconnected systems of
packet-switched computer communication networks.The internet protocol provides
for transmitting blocks of data called datagrams from sources to destinations,
where sources and destinations are hosts identified by fixed length addresses.
The internet protocol also provides for fragmentation and reassembly of long
datagrams, if necessary, for transmission through "small packet"
networks.
IPNS ISDN PBX Networking
Specification is an ISDN based protocol allowing telephonic features in network
configuration.
ISDN Integrated Services
Data Network.
Kermit Protocol which
offers a remote terminal service and a file transfer facility. It is packet
oriented and uses 8 data bits per byte and supports sliding windows and data
compression.
KD This is the ETSI
terminology for the digital accesses to the public switched network. KD1
represents the basic access , KD2 the primary rate access and KD3 the non ISDN
digital access ( e. g. PCM 30) LAN Local Area Network. Any physical network
technology that operates at high speed over short distances.
LAPB Link Access Procedure
Balanced. Protocol of the X25 layer 2, based on
HDLC frame exchange.
LAPD Link Access Protocol
on D channel. See Q921.
LAT Local Area Transport.
LAT means DIGITAL's communications model for resource sharing between computer
hosts connected to an Ethernet network and interactive and application
terminals and printers connected to the same network.
LD This is the ETSI
terminology for the local digital accesses to the PABX network. LD1 represents
the basic access ( S0) , LD2 the primary rate access ( S2) and LD3 the non ISDN
digital access ( e. g. UA )
LLC Logical Link Control.
(IEEE 802.2). Data link sub-layer used in LAN communication protocols.
LME The Layer Management
Entity provides the layer specific management functions.
MAO Maintenance
administration and operations
MAC Medium Access Control.
Data link sub-layer used in LAN communication protocols.
MANAGING PROCESS Managing
Processes have the responsibility for management activities, therefore managing
processes issue operations and receive notifications.
MAP Manufacturing
Automation Protocol. Developed by General Motors, MAP architecture is based on
OSI model. MAP products use the token bus.
MAU Medium Access Unit.
MD This is the ETSI
terminology for the private links between the PABXs ( e.g. a leased line) . MD1
represents a private 2B+D link , MD2 represents a 30B+D private link and MD3 a
proprietary digital private link.
MIB Management Information
Base is the conceptual repository of management information within an open
system.
NUMERIS Name of the French
public ISDN.
PAD Packet Assembler/
Desassembler (X3 CCITT Recommandation). Term used with packet networks that
refers to a terminal multiplexor device that forms a connection between
terminals and hosts. A PAD accepts characters from conventional terminal and
sends them across a packet network. It accepts packets from a packet network,
extracts characters, and displays them on a terminal.
PAV "Point
d'Accès Videotex". Identical to a PAD with extensions for videotex
terminals.
PDU Protocol Data Unit.
Data units specified in a protocol(N) and consisting in protocol(N) control
information (PCI) and user (N) data.
PSN Private Switched
Network.
Q921 Protocol of the ISDN
layer 2, based on HDLC frame exchange.
Q931 Protocol of the ISDN
layer 3 (network), providing the user/network interface.
QOS Quality Of Service.
Set of negotiated parameters between the two cooperating entities. QOS is
negotiated at connection establishment phase.
RFC Requests For Comments
(RFC) provide informations, definitions and specifications of protocols used in
the ARPA world (ex: TCP, IP, NFS, TELNET, SNMP ...).
ROSE The Remote Operation
Service Element is an ASE that provides services to support interactive
applications in a distributed open systems environment.
RTC "Reseau
Telephonique Commuté". French Public Switched Network.
S0/S2 Basic and primary
ISDN interfaces.
SAP Service Access Point.
Point where the services(N) are provided by an entity(N) to an entity(N+1).
SMAE System Management
Application Entity is the application layer entity responsible for
communication between systems management application processes.
SMAP The System Management
Application Process is the local process within a system that is responsible
for executing system management functions.
SMASE The System
Management Application Service Element defines the semantics and abstract
syntaxes of information transferred as relevant to specific functional area.
SMF The System Management
Functions are those functions that accomplish users requirements in an OSI
management environment.
SMFA The Specific
Management Functional Area is a user requirements category of systems
management.
SMI The Structure of
Management Information defines the logical structure of system management
information.
SNA System Network
Architecture. It's the IBM master plan for communications with and among IBM
computers, terminals, and office systems.
SRT self routing tag;
basic address allowing the automatic routing of the VLF
TCP Transmission Control
Protocol. TCP is a connection-oriented, end-to-end reliable protocol designed
to fit into a layered hierarchy of protocols which support multi-network
applications. The TCP provides for reliable inter-process communication between
pairs of processes in host computers attached to distinct but interconnected
computer communication networks.
Telnet Terminal Network.
Telnet builds on TCP services a fairly general bi-directional, eight-bit byte
oriented communications facility. Its primary goal is to allow a user at one
site to interact with a remote system at another as if the user's terminal
connected directly to the remote machine.
TOP Technical and Office
Protocol. Developed by Boeing, TOP architecture is based on OSI Reference
model. TOP products use the CSMA/CD or Token Ring access methods.
TRANSFIX Name of a French
data transmission service. It provides digital, permanent and synchronous
specialized links.
TRANSPAC Name of the
French public packet switched data network.
UDP User Datagram
Protocol. This protocol provides a procedure for application programs to send
messages to other programs with a minimum of protocol mechanism. The protocol
is transaction oriented, and delivery and duplicate protection are not
guaranteed.
V21/V22/V23 Set of CCITT
recommendations specifying asynchronous and synchronous
V24/V35 interchange
circuit definitions.
V25/V25BIS PSN automatic
answering and calling equipment.
V110 Specifies the rate
adaptation for the support of synchronous and asynchronous equipment using the
V series type interface on a PSN.
V120 Specifies the rate
adaptation for the support of synchronous and asynchronous equipment using the
V series type interface on a PSN.
VLF variable length frame
WAN Wide Area Network. A
network typically over relatively large geographic areas.
X3 Packet
Assembly/Disassembly facility in a data network. It lists options and defaults
for interactive asynchronous terminal connection to packet networks.
X11 see X-Windows.
X21 Specifies interface
between DTE (Data Terminal Equipment) and DCE (Data Circuit terminating
Equipment) for synchronous operations on data networks.
X31 t.b.c.
X25 Network communication
packet switched protocol of the data link and network levels (connection
oriented) of the OSI Reference Model.
X28 DTE/DCE interface for
asynchronous DTE accessing the PAD facility.
X29/X29M Procedure for
exchange of control information and user data between a packet mode DTE and a PAD
facility.
X32 Procedure for access
between users and packet networks thru the switched telephone network and thru
circuit switched public data networks.
X500 Directory Services.
Network communication protocol enabling transparent access to services in a
distributed environment.
X-Windows Protocol which
defines a high level interface to drive graphic terminals.
2.2. DHS3 acronyms and abbreviations
DHS3 generic name of DHS
30 and 32. It is also the name of the project which is in charge of developing
the system
DHS3x generic name of the
new range of Alcatel PABXs. It includes the DHS 30, 32 and 34 configurations
CLUSTER set of several
interconnected crystals
CRYSTAL name of the full
meshed aarchitecture
Chapter 3 Main requirements for DHS 30-32
Chapter 4 Description of the characteristics of the
product
Chapter 5 Architecture of the system: the choices
Chapter 6 Architecture of the system: the system in release 0
Chapter 7 Architecture of the system: the hardware
7.3.
CPU
Two boards are needed to
implement the hardware. The CPU1 supports the processing unit while the IO1
supports the IO controller, the system clocks and power.
A connecting PCB (ATB) is
plugged in front of the CPU1 and IO1 boards and conveys the power supply for
the plateform, the AT bus, power station alarm and controller's watchdog signals.
Behind the back panel, a
connecting board (Ccard) is plugged into the DIN sockets of IO1 and CPU1. It
supports sockets for tape recorder, alarm relay logic, trunk line diversion
logic, protection key, floppy disk and RS232C links (the 4 connected to the
CPU).
7.3.1. CPU1 (processing
unit)
7.3.2. IO1
7.4. PRA coupler
7.5. PCM coupler
7.6. UA coupler
7.7. Analog subscriber
cupler
7.8. BRA coupler
7.9. INT1 couplers
7.10.
Analog specific couplers
7.11.
the USC-VG board
7.12.
US shelf
7.13.
Crystal backpanel
7.14.
Power supply architecture
7.15.
Clock and synchronisation
Chapter 8 Architecture of the system: the packaging
Chapter 9 Architecture of the system: the software