Lucent Technologies 555-230-024 User Manual

Introduction

555-230-024

Issue 5    January 1998 

The main configurations are:

1. Basic system consisting of a Processor Port Network (PPN) only.

2. Directly-connected system consisting of two Port Networks (PNs): one 

PPN and one Expansion Port Network (EPN) connected directly together.

3. Directly-connected system consisting of three PNs (one PPN and two 

EPNs) connected directly together.

4. Center Stage Switch-connected system consisting of up to 15 EPNs 

interconnected by one Switch Node (SN) to the PPN.

5. Center Stage Switch-connected system consisting of up to 21 EPNs 

interconnected by two SNs to the PPN, and up to 43 EPNs interconnected 
by three SNs to the PPN.

Direct-connect configurations have these distinguishing characteristics:

■

Every port network is connected to every other port network via an 
expansion interface circuit pack and a fiber optic cable.

■

Each fiber is connected to a fiber transceiver that can transmit great 
distances.

In large systems, a port network can be hundreds of kilometers away from the 
central site. These remote port networks are connected to the other port networks 
via a Digital Signal Level 1 (DS1 

— 

T1 or E1) link attached to a converter board, 

which in turn is connected to the expansion interface. The converter board con-
verts the fiber optic signals between DS1 protocol and the internal expansion 
interface protocol so the signal can travel over dedicated public or private lines.

Center Stage configurations have these distinguishing characteristics:

■

An expansion interface in every port network is connected to a switch 
node interface in the Center Stage Switch.

■

Remote Expansion Port Networks require T1/E1 Converter pairs at the 
remote end and switch node T1/E1 Converter pairs at the switch node. In 
the pairs, the T1/E1 Converter board converts the fiber optic signals 
between T1/E1 protocol and the internal expansion interface protocol so 
the signal can travel over dedicated public or private lines.

■

Switch node interfaces and fiber optic cables are also required for 
communication between switch node carriers. The number of switch node 
interfaces required depends on the call traffic between port networks 
whose switch node interfaces reside in different carriers.