Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 System Description Manual

							DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Overview of DEFINITY ECS R8 
1 The ProductName 
1 —Overview of DEFINITY ECS R8
This document provides a general overview of the DEFINITY ECS R8.2.
The ProductName
The DEFINITY ECS is a digital voice communications switch that processes and routes 
telephone calls and data communications from one endpoint to another. See Figure 1. 
						

							Overview of DEFINITY ECS R8 
2 The ProductName 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Figure 1. The System as a Digital Switch
All endpoints are external to the system. The voice and data signals going to the 
endpoints enter and leave the system through 
port circuits. The system makes 
high-speed connections between analog and digital trunks, data lines connected to host 
computers, data-entry terminals, personal computers (PCs), and IP network addresses.
DEFINITYMultimedia
call center
Voice terminal Attendant
console
Data
terminal Management
terminal
Vo i c e
messaging
system
Outside privat
eline data
transmission
equipment
Digital
facilities Analog
facilities
AUDIX DEFINITY Wireless
Business System
Voice terminal
with data moduleData terminal
Host
computer
Data
terminals
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							DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Overview of DEFINITY ECS R8 
3 System Components 
The system converts all incoming (external source) analog signals to internal digital 
signals. Incoming (internal or external source) digital signals are not converted. Inside the 
system, voice is always coded digitally. Outgoing digital signals from the system are 
converted to analog signals for the analog lines and trunks.
System Components
The basic system component is the Port Network (PN), consisting of port circuits 
connected to internal buses that allow the circuits to communicate with each other. See 
Figure 2.
Processor Port Network (PPN)
The required Processor Port Network (PPN) contains the Switch Processing Element 
(SPE). The SPE is a computer that operates the system, processes calls, and controls 
the PN containing the port circuits.
Expansion Port Network
An Expansion Port Network (EPN) (optional) contains additional ports that increase the 
number of connections to trunks and lines. 
Center Stage Switch (CSS)
A Center Stage Switch (CSS) (optional for 3 PNs or less) in the DEFINITY ECS R8r is the 
central interface between the PPN and the EPNs. The CSS consists of 1, 2, or 3 switch 
nodes (SN). One SN can expand the system from 1 EPN to up to 15 EPNs. Two SNs can 
expand the system to up to 29 EPNs. Three SNs can expand the system to up to 43 
EPNs. 
NOTE:
The number of EPNs that can be connected with 2 or 3 SNs may be less than the 
numbers given, depending on the internal SN-to-SN traffic. 
						

							Overview of DEFINITY ECS R8 
4 System Components 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
ATM Switch (Category A only)
The Asynchronous Transfer Mode (ATM) switch is a replacement option for the CSS or 
the direct-connect switch. Several Lucent ATM switch types can provide DEFINITY ECS 
port network connectivity. Non-Lucent ATM switches that comply with the ATM standards 
set by the European Union can also provide DEFINITY ECS port network connectivity.
Main System Configuration
Figure 2 shows the following 6 main system configurations:
1. Basic system consisting of a Processor Port Network (PPN) only.
2. Direct-connect system with 3 PNs (1 PPN and 1 or 2 EPNs) connected directly 
together.
3. Center Stage Switch (CSS)-connected system with up to 15 EPNs interconnected 
by 1 SN to the PPN.
4. CSS-connected system with up to 29 EPNs connected by 2 SNs to the PPN, and 
up to 43 EPNs connected by 3 SNs to the PPN.
5. ATM switch-connected system with up to 43 EPNs.
6. Multiple ATM switches over a wide area with up to 43 EPNs. 
						

							DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Overview of DEFINITY ECS R8 
5 System Components 
Figure 2. Main System Configurations
PPN
PPNPPN PPN
EPN
EPNs
(up to 43)EPNs EPN
SN SN
EPN
EPNs EPNs
EPNs
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CSS
SN
CSS-connected system
(PPN, CSS, and up to 15 EPNs)
ATM-connected system
(PPN, ATM, and up to
43 EPNs)
ATM-connected system
(PPN, multiple ATMs, and up to
43 EPNs)CSS-connected system
(PPN, CSS, and up to 43 EPNs)
CSS
PPN
Basic systemTo terminals
or trunks
1
PPN
EPN EPN
Directly-connected system
(PPN and up to 2 EPNs)
2
3
56
4
ATM SwitchATM Switch
EPNs ATM SwitchEPNs ATM Switch 
						

							Overview of DEFINITY ECS R8 
6 System Configurations 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
System Configurations
Figure 3 shows a direct-connect system with an SPE in the PPN. Buses route voice and 
data calls between external trunks and lines.
Figure 3. Components of a Direct-Connect System
PPN
Processor busSPE
Processor Memory
Po r ts
Po r ts
Po r ts Po r ts Expansion I/O
Expansion I/O Expansion I/O Expansion I/O Expansion I/OFiber optic cableExpansion I/O
Maintenance
Maintenance EPN EPNPacket
busTDM
busTerminal
Terminal TerminalExternal trunks,
lines, and IP
addresses
External
trunks, lines,
and IP
addresses External
trunks, lines,
and IP
addressesExternal
trunks, lines,
and IP
addresses Network Control/
Packet Interface
Packet
busPacket
bus
TDM bus TDM bus
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							DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Overview of DEFINITY ECS R8 
7 System Configurations 
Figure 4 shows a system with the added CSS to route voice and data calls between 
external trunks and lines.
Figure 4. Components of a CSS-Connected System
NOTE:
The components of an ATM-connected system are similar to those shown 
in Figure 4. However, in an ATM-connected system, the CSS is replaced 
with an ATM switch or switches and each Expansion I/O is replaced with a 
TN2305 or TN2306 circuit pack.
PPN
Processor busSPE
Processor Memory
Ports
Ports
Ports Ports(Port network) Expansion I/O
Expansion I/O
MaintenanceTypi c alT1 or E1
EPN CSS Packet
busTDM
bus
Te r m i n a l
Te r m i n a l
External
trunks
and lines
External trunks and linesI/O I/O
EPN EPN
EPN EPN
Packet bus
TDM bus
cydfcnf1 RPY 020998
Fiber optic cable 
						

							Overview of DEFINITY ECS R8 
8 System Configurations 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Switch Processing Element (SPE)
When a device, such as a telephone, goes off-hook or signals call initiation, the SPE 
receives a signal from the port circuit connected to the device. The digits of the called 
number are collected and the switch is set up to make a connection between the calling 
and called devices. 
The SPE consists of the following control circuits connected by a processor bus:
nProcessor: All R8 systems use a Reduced Instruction Set Computer (RISC) 
processor. The TN790 processor circuit pack is used in R8si systems. The TN798 
is used in R8csi systems. The UN332C is used in R8r systems. 
nMemory: R8csi and R8si systems use 16 Mbytes of flash Read Only Memory 
(ROM) and 16 Mbytes of Dynamic Random Access Memory (DRAM) resident on 
the processor circuit pack. R8r systems require 3 TN1650B memory circuit packs 
to provide a total of 96 Mbytes of DRAM.
nStorage: In all R8 systems except R8r, translations are stored in nonvolatile 
memory on a PCMCIA memory card. In R8r systems, the disk drive is a nonvolatile 
system bootstrap and translation storage device. A R8r system can use an optic 
drive as backup storage.
nInput/output (I/O) circuits: These act as interfaces between the SPE and the time 
division multiplexing bus and packet bus.
nMaintenance interface: connects the system to an administration terminal and 
monitors power failure, clock signals and temperature sensors.
Port Network (PN)
The Port Network (PN) consists of the following components:
nTime Division Multiplexing (TDM) bus: Has 484 time slots, 23 B channels and 1 D 
channel available per bus. Runs internally throughout each PN and terminates on 
each end. Consists of two 8-bit parallel buses: bus A and bus B. These buses carry 
switched digitized voice and data signals and control signals among all port circuits 
and between port circuits and the SPE. The port circuits place digitized voice and 
data signals on a TDM bus. Bus A and bus B are normally active simultaneously.  
						

							DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Overview of DEFINITY ECS R8 
9 System Configurations 
nPacket bus: Runs internally throughout each PN and terminates on each end. It is 
an 18-bit parallel bus that carries logical links and control messages from the SPE, 
through port circuits, to endpoints such as terminals and adjuncts. 
The packet bus carries logical links for both on-switch and off-switch control 
between some specific port circuits in the system; for example, D-channels, X.25, 
and remote management terminals. Typically, the csi model does not support the 
packet bus. Any MAPD or ISDN application rides the TDM bus. However, in R7 
and later csi systems with C-LAN, the applications use the packet bus provided by 
the C-LAN board.
nPort circuits: form analog/digital interfaces between the PN and external trunks and 
devices providing links between these devices and the TDM bus and packet bus. 
Incoming analog signals are converted to pulse-code modulated (PCM) digital 
signals and placed on the TDM bus by port circuits. Port circuits convert outgoing 
signals from PCM to analog for external analog devices. All port circuits connect to 
the TDM bus. Only specific ports connect to the packet bus.
nInterface circuits: Located in the PPN and in each EPN. These are types of port 
circuits that terminate fiber optic cables connecting TDM buses and the packet bus 
from the PPN cabinet to the TDM buses and packet bus of each EPN cabinet. The 
fiber-optic cable also connects the CSS to the PPN and the EPNs. These interface 
and cabling terminations provide a transmission path between the port circuits in 
different PNs.
In ATM-PNC, the ATM Interface connects each PN to the ATM switch. An 
Expansion Interface (EI) circuit pack also terminates each end of a cable 
connecting the PPN to an EPN, each end of a cable connecting an EPN to another 
EPN, and the PN end of a cable connected between a PN carrier and an SN 
carrier.
A Switch Node Interface (SNI) circuit pack terminates the SN carrier end of a cable 
connected between an SN carrier and a PN.
nDS1 converter: Converts from a fiber interface to a DS1 interface between PNs for 
DS1 remoting.
nService circuits: Connect to an external terminal to monitor, maintain, and 
troubleshoot the system. Also provide tone production and detection as well as call 
classification, modem pooling, recorded announcements, and speech synthesis. 
						

							Overview of DEFINITY ECS R8 
10 System Configurations 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Center Stage Switch (CSS) 
Figure 5 shows the CSS linking the PPN to EPNs by the SNI circuit packs in a SN carrier. 
A SN reduces the amount of interconnect cabling between the PPN and the EPNs by 
acting as a 
hub to distribute cabling. 
A system using a CSS can connect from 3 to 43 PNs. The CSS can consist of up to 3 SN 
carriers. The CSS can also consist of 2, 4, or 6 SN carriers (duplicated SNs) in a 
critical-reliability system.
Each SN contains from 1 to 16 SNI circuit packs. Each interface can connect to a PN or 
another SN using fiber-optic cable. One interface always connects to the PPN and 1 
connects to each EPN.
Figure 5. CSS with Switch Nodes (SNs)
In a high reliability system (with duplicated processor), 2 SNI circuit packs connect to the 
PPN, allowing up to 15 PNs to connect to 1 SN, up to 20 PNs to connect to 2 SNs, and up 
to 25 PNs to connect to 3 SNs, depending on the exact configuration chosen.
ATM Port Network Connectivity 
(Category A only)
Several Lucent ATM switch types can provide port network connectivity for a DEFINITY 
ECS. Non-Lucent ATM switches that comply with the ATM standards set by the ITU can 
also provide DEFINITY ECS port network connectivity. In this configuration, TN2305 
multi-mode or TN2306 single-mode ATM circuit packs are installed on the port networks 
and connected to the ATM switch with the multi- or single-mode fiber specified for the 
ATM switch.
PPN
SNISNISNISNISNI Switch Node
(1 to 16 SNIs)
EPNEPNEPNEPN
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