FREE ESSAY ON PBX HYBRID NETWORKS

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
Model 
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 
480 
Port Capacity 
588 
Trunk Capacity 
4 to 240 (dependent on # of lines configured) 
Simultaneous Calls Possible 
294 
Traffic Capacity (BHCAs) 
10,000 
Switching Matrix 
TDM 
Main System CPU 
Fujitsu proprietary 8-bit or 16-bit CPU H5H5
Component Redundancy 
Not available 
Amt. of Main System Memory 
1.5MB 
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 
Optional 
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 
200 
Line Capacity 
80 
Simultaneous Calls Possible 
108 
Switching Matrix 
Time division 
Type of Processor 
Centralized 68000 microprocessor 
Type/Amount of Main Memory (bytes) 
896K RAM 
Port Capacity 
280 
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