VMUX-SYSTEM ARCHITECTURE (CARDS)

SYSTEM ARCHITECTURE

CARDS

The design of VMX-0100 is modular and is based on multiple processors. Broadly VMX-0100 system can be partitioned as follows:

(i)         Common Cards

·         T M E Card

·         Redundant P S U Card

(i i)       User Interface Cards

            (a)        VF Cards

·         E & M Card: Required for E&M 2W & 4W interfaces.

·         F X O Card: Required for Loop I/C and Exchange Line interfaces.

·         F X S Card:  Required for Subscriber, Loop O/G and Hot Line interfaces.

            (b)       Data Cards

·         G703 Card: Required for 64Kbps G.703 Co-directional Data

·         U D T Card: Required for 1200/2400/4800/7200/9600/19200 baud synchronous or asynchronous data.

·         N64 Card: Required for Nx64 data where N _max=30

·         T P C Card: Required for 50/100 baud Teleprinter Data on spare bits.

·         U I F Card: Required for 64/128K Data Extension to remote sites.

·         FE1 Card: Required for supporting two Fractional E1 streams

            ( c )      Optional Cards

·         L P C Card: Required to protect the 2Mb tributary carrying the omnibus channels in case of any major failure in the network.

·         D A C Card: Required for monitoring the voltages & other environmental parameters like Temperature, Pressure, Humidity, Battery Voltage, A.C. Voltage etc.

(i)         PSU Card

Power Supply in the VMX-0100 is DC-DC converter based on S M P S  technology. VMX-0100 supports optional redundant P S U Card for higher availability. The two modules go in slot 1a & slot 1b of the motherboard. Apart from generating the output voltages required for the functioning of the system, it also generates the 75V rms , 25Hz. ring signal required for the F X S card. The input output specifications are as under:

·         Input:

-36 V to -72V (-48V nominal)

·         Output:

+5V/10 Amp

+12V/1.05 Amp

-12V/1.05 Amp

A filtered -48V given to loop signalling VF Cards for powering the VF Loop interfaces. Typical power consumption of VMX-0100 is 75W.

(ii)        T ME Card

T ME Card form the heart of VMX-0100 system and goes in slot no. 3 of the VMX-0100 Shelf. This is a microprocessor-based card employing Motorola’s MC68EN302 Microprocessor and functions as the overall controller of VMX-0100. It implements all programmable features of the mux , scans the mux for alarm conditions, maintains history files as well as takes the user defined action whenever the alarm condition is detected. It also scans the mux hardware for correct functioning and signals the user whenever any abnormality is seen. It also interacts with N M T user over a user-friendly menu based man machine dialogue for various actions requested by him. This implements full featured cross connect between PCM1, PCM2 trunks and the local user ports. It also functions as the signalling processor card for VMX-0100 and extracts the signalling information coming on time slots 16 of P CM 1 and 2 and sends them to the VF ports and vice versa. It houses the clock handing logic & P L L. It also interacts with the Network management System either through Rs-232 or Ethernet interface for providing Network Monitoring & Control.

(iii)       User Interface Cards

All user interface cards implement the required specifications of the user interface port. They also sense and drive the line, register signalling conditions on the line and pass them on to the TME card after processing.

All user interface cards support 4 interfaces per card except the N*64, U I F, FE1 Cards which provide 2 interfaces per card. All ports on a card however can be independently mapped to any time slot on PCM1 or PCM2.

            (iv)       LPC Card

This Card is used to protect the P1 & P2 streams carrying the traffic in case of any major failure in the network. It provides the protection to the main 2Mb stream in a manner that all nodes on the chain remain connected to each other on the omnibus channels. It uses two 2Mb streams one spare & one backup for providing the protection.

            iv)        D A C Card

This Card has

-           8 auxiliary input ports, which can be used for getting status of events.

-           8 auxiliary dry contacts for controlling 8 tasks.

-           6 analog inputs for monitoring up to 6 environmental parameters.

                        -           System voltages monitoring.

                        This card can go into any line card slot.
DAC Card is supporting Unit of EACU i.e External Alarm And Control Unit