NEC nd-20292 This power supply accepts a DC input voltage, PSE-DD-1 PSU, RSG-E Unit, RAA-E Unit

5.PSE-DD-1 PSU

This power supply accepts a DC input voltage of

:-48VDC and converts it to the necessary operating DC voltages of -5V, + 5V and -24V, required by a CCU.

The PSU allows the system to be powered from a locally provided nominal -48VDC power source. Battery Backup can be connected to the -48V DC power

source, thereby avoiding disruptions of system operations caused by commercial power failures and brownouts.

The PSE-AD-( ) and PSE-DD( ) should not be installed

in the same system. Operational integrity of the system may be degraded if power is lost to individual ccu’s.

6.RSG-E UNIT

The RSG-E Unit is the Ringing Supply Generator required to provide ringing signal to Single Line Telephones (SLTs), modems, and a Voice Mail system.

The RSG-E Unit is mounted into the CCU (next to the PSU) to support up to thirty two SLTs, up to four modems, and/or Voice Mail.

The RSG-E Unit installed in a CCU supplies ringing signal to SLTs, Voice Mail and modems connected to that CCU. One RSG-E Unit can supply ringing signal to an adjacent CCU, if the combined CCU ringing requirements are not exceeded.

7.RAA-E UNIT

The Remote Administration Adaptor (RAA-E) provides access to the Electra Mark11 System program from a remote location. The system program can be changed, defective ports can be busied out or put back into service, after the problem is corrected.

To accomplish this function, the following equipment is required:

a.At Job Site:

1.CPU-EB(or higher revision level) ETU

2.ESI-E( ) ETU Tone circuit for RAA-E termination)

3.Modem (212A compatible with auto answer)

4.SLI-E( ) (one circuit for Modem termination if required) ETU

5.RSG-E unit (if Modem terminates on an SLI-E( ) ETU)

b.At the Remote Location:

1.Modem (212A)

2.NEC Powermate or IBM compatible PC i

3.RAA Host Disk

ND-20292

CHAPTER 1

APRIL, 1990

t or any RAA-E compatible unit, ie., NEC PC8300 Laptop Computer, NEC PC8231A Floppy Disk Drive, NEC Multispeed, Datavu’s SPARK laptop.

8.CPU-E ETU

A CPU-E (or higher revision level) ETU is the Central Processing Unit and the heart of this system. It provides overall control via the main processor (16 bit

microprocessor) by communicating with the distributed processors mounted on the TSW-E( 1 and MMC-E ETUs.

The CPUs RAM memory is backed up with a

rechargeable NiCad battery which will retain the memory for up to seven days.

One CPU-E (or higher revision level) ETU must be installed in the ESE-32B-1 CCU.

9.MMC-E ETU

The MMC-E ETU is the Module Memory, with a 4 bit microprocessor, and Controller Unit required for each ESE-32E-1 CCU. It controls data transmission between the CPU-E( ) ETU and the interface cards installed in the ESE-32E-1 CCU in which the MMC-E ETU is installed.

Data from and to the CPU-Et 1ETU and each interface

card is temporarily stored in the memories of the MMC-E ETU.

10.TSW-E ETU

The TSW-E ETU is the Time Division Switch Unit required for the ESE-32B-1 CCU. It supplies most of the tones required in processing telephone calls. It establishes paths between stations and outside lines, extension lines or call process tones.

The TSW-E ETU also has functions similar to the MMC-E ETU in the ESE-32B-1 CCU and provides the source output for external paging.

To connect MOH and BGM sources, the TSW-E ETU houses audio digitizer circuits to change analog signals to digital signals.

11.TSW-EB ETU

The TSW-EB ETU is the Time Division Switch Unit required for the ESE-32B-1 CCU when the fourth CCU is installed. It supplies most of the tones required in processing telephone calls and it also establishes paths between stations and outside lines, extension lines or call process tones, the same as the TSW-E ETU.

The TSW-EB ETU also has an additional connector to interface to the fourth MMC-E ETU in the third ESE- 32E-1 CCU.

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