Pbx Hybrid Networks

PBX and Key/Hybrid Systems
PBX and Key systems are the wave of communication for business everywhere. The key difference between PBX and Key/Hybrid systems are the amount of stations each can handle. Key systems are designed for clients with very small line size requirements and very basic needs. It usually handles between 16 to 48 stations. PBX systems on the other hand handle a lot more stations as well as more features and sophistication. PBX are designed for larger corporations and cost much more than a simple key system communication need. Another key advantage of PBX system is it allows for room for corporation growth over the years than that of a Key System or Hybrid system.
An example of a PBX system and some of its features is the Fujitsu BCS Series 3:1
Series 3
Product Type
Digital PBX
FCC Registration Numbers
(Key) BJ885Z-60084-KF-E;
(Hybrid) BJ8USA-60083-MF-E
(PBX) BJ8USA-75355-PF-E
Date Announced
July 1993
Number of Systems Installed
Approximately 2,375 +
Line Capacity
Port Capacity
Trunk Capacity
4 to 240 (dependent on # of lines configured)
Simultaneous Calls Possible
Traffic Capacity (BHCAs)
Switching Matrix
Main System CPU
Fujitsu proprietary 8-bit or 16-bit CPU H5H5
Component Redundancy
Not available
Amt. of Main System Memory
ISDN Support
PRI only (BRI not available)
T-Carrier Support
Direct T1 interface
Wireless Support
SpectraLink WTS
Voice Messaging Support
Fujitsu TranSend/TranSend Lite unified messaging platform; Fujitsu's IVS voice messaging platform; or various third-party voice mail solutions. H6H6
ACD Support
Fujitsu Series 3 ACD; ACD Report Manager H7H7
Call Accounting Support
Integrates with Fujitsu's Call Manager H8H8
PC Attendant Console
The features of the Fujitsu BCS Series 3 is what most would look at a well functioning PBX. The price rang of the phones of each line are between 300 and 500 dollars per line with a basic package of 6500 for the TransSend unified messaging platform.
An example of a functioning Key/Hybrid System is the Lucent Merlin Legend.
A couple features of this key system are:2
Digital key/hybrid/PBX/behind-Centrex system H2H2
Date Announced
August 1991
Date Installed
October 1991
FCC Registration Numbers
Key--AS593M-72914-KF-E; multifunction hybrid--AS593M-72682-MF-E H3H3
Target Market
Small- to medium-sized businesses
General Specifications
Digital Station Capacity
Line Capacity
Simultaneous Calls Possible
Switching Matrix
Time division
Type of Processor
Centralized 68000 microprocessor
Type/Amount of Main Memory (bytes)
896K RAM
Port Capacity
As you can tell the system is can not handle as much as the PBX system but for small business the Merlin Legend is a perfect fit. The price of the key/hybrid system the basic Merlin Legend Release 7.0 module retails for US$1,494. As you can tell that is a steep difference in price between the two.
In conclusion when comparing the key system and PBX you compromise the features and price. With the PBX of the Fujitsu you spend so much more money but you get a lot of different features as well as the ablility to grow and become a bigger corporation with larger features. The Key system just leaves you with the bare requirements for your small business