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...

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...

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...

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...

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...

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...

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...

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...

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...