Vodavi Starplus Sts Key System Installation Manual

1
Introduction
This manual provides the information necessary to operate and maintain the STS System. The 
described features are based on the current software release. If any of these features do not 
work on your system, call your sales representative.
This chapter describes and illustrates the components that may be used with the STS System. 












 
 
 
 
 
 

General Information1-3
Chapter 1 - Introduction
General Information
System Overview
The STS Key Telephone System supports a maximum configuration of 28 CO/PBX/Centrex lines  
and 50 station devices. The Basic Key Service Unit (BKSU) and Expansion Key Service Unit (EKSU) 
accommodates plug-in boards that can be added to expand CO/STA capacity. Both KSUs can 
generally support a 12x24 configuration for a total capacity of 28x50. The BKSU and EKSU 
cabinets are installed using industry-standard blocks,...

1-4Key Service Unit
Chapter 1 - Introduction
Key Service Unit
This diagram illustrates the basic layout of both KSU cabinets, the card slots for the extension 
boards, and the locations of the Champ connectors.
Basic Cabinet
The Basic Key Set Unit (BKSU) has mounting holes so that it can be mounted on the wall. The 
Main Board Unit (MBU) contains the main CPU – MC68LC302, Memory – the memory size is
1 Mbyte (4Mbit x 2), Data is 512 Kbytes (1 Mbit x 4), and all other system-operating type circuitry 
to...

Key Service Unit1-5
Chapter 1 - Introduction
Main Board Unit
The Main Board Unit (MBU) controls and manages communication between peripheral 
interface, supervises all resources in the system, controls gain adjustment of PCM signal, 
generates system tone, and manages call processing of the system.
PERIPHERAL & DAUGHTER BOARDS -- The following can be installed on the BKSU’s MBU:
1 - Modem Unit
2 - Digital Telephone Interface Boards (8 port)
1 - T1 Interface Board (24 channels) & 1 Phase Lock Loop Unit
2...

1-6Extension Boards
Chapter 1 - Introduction
Expansion Cabinet
The Expansion Key Service Unit (EKSU) mounts above the BKSU and is connected via cables that 
extend the voice and data signaling to and from the BKSU. An integral power supply provides 
enough power to support all CO lines, stations, and daughter board options.
The EKSU has mounting holes so that it can be mounted on the wall. The station connections 
are via a 50-pin amphenol connector. This connector is located in the EKSU. CO connections...

CO Interface Boards1-7
Chapter 1 - Introduction
Single Line Telephone Interface Board (4 port)
The Single Line Telephone Interface Board (SLIB4) provides four standard 24V 2500-type Single 
Line interfaces. The Single Line station circuit specifications for the SLIB4 are as follows:

One-pair wiring to SLT devices

24 V power for all four circuits

RGU power for all four circuits

Optional Message Wait Unit (MSGU) (4 circuit)

Loop interrupt
CO Interface Boards
The types of CO Interface boards that can...

1-8Add-On Boards
Chapter 1 - Introduction
Add-On Boards
Message Wait Unit
The Message Waiting Unit (MSGU48) provides a 90V message voltage to light the message 
indicator on single line telephones.
One MSGU can be installed on each SLIB4 (required if message wait indication is needed).
Modem Unit
The Modem Unit (MODU) provides a communication interface for remote maintenance and 
remote PC Admin.
The MODU allows the system to function as follows:

Operates at 9600 baud and installs in the BKSU.

Provides...

2
System Specifications
This chapter describes the STS system specifications. It also provides a part number listing of 
basic and ancillary components of the system.