Specifications
Peripheral Devices 
Printed in the USA  Page 1  GCA39-818 Rev 3, Issue 9/01 
Peripheral Devices for Comdial Systems 
PCIU 
NOTE: A product discontinuation is planned for the PCIU. 
The Personal Computer Interface Unit (PCIU) is a device you can connect between a digital 
station port and its proprietary telephone. The PCIU allows telephone users to initiate telephone-
related functions from their personal computers (PC). Applications such as this are commonly 
known as Computer Telephony Integration (CTI) applications. The PCIU will function with the 
DSU and DSU II, DXP, DXP Plus, and FX systems). 
The PCIU includes Service Provider Interface (SPI) software on computer diskettes. When you 
install this SPI software on a PC, the PC users can employ their Telephony Applications 
Programming Interface (TAPI), third-party, Microsoft Windows applications programs to 
emulate many useful telephone functions like Dialing, Transferring, and Conferencing. 
Depending on the PCIU model, it comes bundled with either Impact Call or with Visual Call 
Management (VCM) software. Impact Call is a CTI application that offers on-screen call 
management and a detailed call log. VCM is a capability of the Key Voice voice processing 
system with a revision of 10.0 or later. VCM provides a series of computer-displayed menus that 
users can use to simultaneously view and manage voice message activity. Of course, to use 
VCM, you must have the Key Voice voice processing system installed and connected to the 
Comdial system’s serial data port. 
Below is example of the PCIU device. The connectivity for the device is extremely easy, even a 
non-technician could do a PCIU installation: 
Connectivity to the PCIU 
Where the PCIU resides in 
an Office environment 










