5ESS Notes

The Primay fuctions of a 5ESS are:

Call Processing
Maintenance
Administraton

Three types of 5ESS Switches:

5ESS Switch
5ESS Switch Compact Digital Exchange CDX
5ESS Switch Very Compact Digital Exchange VCDX

In a 5ESS CDX The CM is replaced by a Compact CM. A compact CM does not support as many SM 's as a normal CM.

In a 5ESS VCDX , the AM , and CM are replaced by an Administrative Workstaion -AW. There is no CNI , the SM handles out of band signaling through the Packet Switch Unit - PSU . Only one SM can be used with a VCDX. In a VCDX the SM Handles 100% of the call processing. VCDX Cannot use Remote Switching Modules - RSM.

5ESS can be used for:

Local, Toll, or Tandem
Wireless
Operator Services
Other

The 5ESS is made up of different modules. The 4 types of modules are:
Administrative Module - AM

Monitors system integrity
Provides user interface
Stores and forwards administrative data

Common Network Interface - CNI

Provides interface to CCS Network

Communications Module CM

Routes controll messages
Routes calls between modules

Switching Module SM

Terminates Lines and Trunks
Performes majority of call processing
Checks its own integrity
Gathers administrative data and forwards it to the AM
Alternative method of providing access to the CCS Network through the PSU
RSM can be miles from the rest of the 5ESS

Information is passed between the CNI, AM and the CM over cables known as Dual Serial Channels DSCH

VCDX Connects directly to the SM using ethernet and Control Processor Intervention -CPI.

Information is passed between the CM and SM over network controll and timing links -NCT

System Software

The 5ESS has the following types of software.

Operating System
Call Processing
Maintenace
Administration
Database

The VCDX Contains all of the software mentioned. In addition it contains Sun Solaris Software to operate the Sun Workstation.

Operating System

Unix Real Time Reliable -RTR
- Controlls applications specific to the Administration Module
Operating System for Distributed Switching -OSDS
- Controlls software in all modules

Call Processing Software

Supports calls from Pick up to hang up
Handles custom call features a subscriber has

Maintenance

Monitor system for hardware and software errors.

Administration

Collects and forwards call processing and maintenence data
Billing

Data Base

Verifies and updates data in the office data bases.

Switch Operation

Flexibility

Modular Growth
Distrigbuted Processing

The VCDX can only be equiped with 1 SM if growth beyond 1 SM is desired, the VCDX can be converted to a full sized 5ESS.

Call within the same office

Callers SM line hardware and software determine type of call
Call type information passed to CM
CM Routes call to appropriate SM

In a VCDX both parties would be connected to the same SM . There is no CM in a VCDX.

Call to another Office

Callers SM line hardware and software determine type of call
Call type information passed to the CM
CM Routes call to the SM with appropriate trunk hardware

Both preceeding examples used In band signaling.

Long distance call

Callers SM hardware and software determines type of call
Call type information passed to CM
CM Routes call to the SM with appropriate trunk hardware (Connected to callers long distance carrier)

CCS