VMUX-(FU. DESC.)PROGRAMMABLE ALARMS AND THRESHOLDS

PROGRAMMABLE ALARMS AND THRESHOLDS

VMX-0100 detects a number of alarms conditions on PCM trunks, VF/Data user ports, clocks and other system status. Among the conditions supported include:

(i)         On PCM Trunks:

·         Loss of Signal

·         Frame Sync Loss

·         Multiframe Sync Loss

·         Excessive FAS errors

·         CRC Sync Loss

·         Excessive Slips

·         Remote Alarm

·         AIS Received

(ii)        Others:

·         Priority Clock Failure

·         VF/Data Port Failure

·         Configuration Mismatch

Each of these alarm conditions can be programmed by user to generate a Major, Minor or no alarm. The Major & Minor Alarms can also be extended to Bay Top Panel to generate the audio & visual indications.

The alarms once generated are also logged in a 100 entries deep alarm history file that can be displayed on the console. The alarm entries in this file include the alarm source, alarm type, alarm state, alarm generation and alarm clear time.

VMUX-(FUN. DESCRIPTION)NETWORK SYNCHRONIZATION

NETWORK SYNCHRONIZATION

VMX-0100 supports a variety of clock input options for network synchronization. These can be:

·         Extracted PCM1 Clock

·         Extracted PCM2 Clock

·         Extracted Synchronous Data Channel Clock

·         External 2.048 MHz Clock

·         Internal Oscillator Clock

The user can specify synchronizing clocks in order of priority. In case of failure of a higher priority clock, the next available lower priority clock is automatically brought into the circuit. In parallel, alarms are generated in case of failure of highest and next to highest priority synchronizing clock.

VMX-0100 also gives out a 120Ω / 75 Ω G.703 2.048 MHz network clock for synchronizing the next equipment in the chain.

VMUX-(FUN.DESCRIPTION)PROGRAMMABLE TIME SLOTS

PROGRAMMABLE TIME SLOTS

The operation of VMX-0100 is programmable or configurable from a VT 100 compatible Network Management Terminal (NMT) connected to it. Through this NMT the user interacts with VMX-0100 over multilevel user-friendly screens to display the existing configuration and / or to enter new configuration. Once entered, the configuration information is stored in a non-volatile RAM (NVRAM) and governs the operation of the Mux henceforth. This NVRAM has a battery life of several years.

The NVRAM comes programmed from the factory with a default configuration setting for all programmable parameters. This default setting can be viewed and altered at site using NMT. The default setting is generally good enough for the operation of VMX-0100 in a typical environment and can also be supplied tailored to a specific user requirement.

VMUX-(FUN.DESC)TYPES OF USER INTERFACES WITH VMX-0100

TYPES OF USER INTERFACES WITH VMX-0100

           The following user interfaces are presently supported by VMX-0100:

            ( i )       VF Interfaces

·         E & M (2W)

·         E & M (4W)

·         Loop Incoming Signalling

·         Loop Outgoing Signalling

·         Exchange Interface

·         Subscriber Interface

·         Hot Line Interface

Through a unique design technique all Loop Signalling interfaces are implemented in just three types of cards, thus minimizing the variety of hardware in the VMX-0100.

            (ii)        Data Interfaces

·         G.703, co-directional, synchronous data interface @ 64Kbps.

·         V.35/V.24/V.11/X.21, synchronous/ asynchronous data interface @ 1200-19200 baud.

·         "N" x 64Kbps, V.35/V.24/V.11/X.21 user configurable, synchronous data interface with N=1 to 30.

·         ISDN Digital Subscriber line (IDSL) supporting 64/128 Kbps.

·         N * 64, G.703 / Fractional E1 Interface.

·         Additional four channels for Teleprinter Data, 50/100 baud on the spare bits.

 64Kbps support is available through GDT Card, which supports four 64Kbps G703 Co-directional Data.

Low speed V.35/V.24/V.11/X.21 support is available through a UDT Card that provides four low speed synchronous  /asynchronous ports of 1200/ 2400/ 4800/ 9600/ 19200 bps in a card.