NEC nd-20292 manual Mfr-Ea, Cnf-E, Ecr-E, Vmi-E, Did, Tli-Eb, Dpa-E, Dta-E

ND-20292

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CHAPTER

2

1

APRIL,

1990

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ETU

CIRCUITS

CALCULATION

MAXIMUM

ETUs

PER

ETU

PER

SYSTEM

COI-E( )

4

Divide

the

number

of CO/PBX

lines

being

used by 4. (Note

1)

10 (Note

7)

ESI-EA/B

4

Divide

the

number

of

Multiline

Terminals,

CO Add-On

Modules,

20 (Note

4)

and DSS/BLF Consoles being used by 4. (Note 2)

SLI-Em

4

Divide the number of Single Line Telephones and/or Modems being

19 (Note

4)

used by 4. (Note 3)

MFR-EA

2

See Table

200-l.

4

CNF-E

1

The

number

of Conference

circuits

being

used.

4

When installing multiple zones of External Page, Chime, BGM to

1

ECR-E

10

Multiline

Terminals,

or

Delay Announcement

Unit,

and/or

tone

ringers, an ECR-E ETU is required.

When

connecting

Voice

Mail

system,

Single

Line

Telephone,

and/or

2 (Notes

4

5

VMI-E

4

Dictation

equipment,

and/or

Auto

Attendant,

VMI-E

ETU is

6, & 8) ’

’

required.

TLI-E

2

Divide

the

number

of

DID

and/or

Dial Pulse E&M Tie Lines being

20 (Note

7)

used by 2. (Note 1)

TLI-EB

2

Divide

the

number

of

DTMF/Dial

Pulse E&M Tie Lines being used

20 (Note

7)

by 2.

(Note

1)

v .

4

rn..

*,.

is not

.

1,

1

rouna

I.,

.

2,

next

.a..

1 ,

,

vote

1:

lr tne result

a wnole

numner,

it

up to tne

nigher

wnole

number.

Note

2:

A Multiline

Terminal,

with

DPA-E

Unit

(Off-hook

Announcement

Adaptor)

or

DTA-E

Unit

(Data

Switching

Adaptor)

installed,

requires an ESI-EB ETU, divide the number of those Multiline

Terminals installed by 4. If the result is not a whole number, round it up to the next higher whole

number.

This

is the

quantity

of ESI-EB

ETUs

required.

If some ports are still available on an ESI-EB, subtract the number of available ports on the ESI-EB- ETU from the number of Multiline Terminals being used w/o DPA-E or DTA-E Units. Then, divide the number by 4. If the result is not a whole number, round it up to the next higher whole number. This is the quantity of ESI-EA ETUs required.

Note 3: It is necessary for an SLT with Message Wait lamp and/or Power Failure Transfer to be supported by an SLI-EB ETU. Divide the number of modems (used for Modem Pooling) and/or Single Line Telephones with Message Wait lamp by 4. If the result is not a whole number, round it up to the next higher whole number. This is the quantity of SLI-EB ETUs required.

If some ports are still available on an SLI-EB ETU, subtract the number of available ports on the SLI- EB ETU from the number of Single Line Telephones w/o Message Wait lamp. Then divide the resulting number by 4. If the result is not a whole number, round it up to the next whole number. This is the quantity of SLI- EA ETUs required.

Note 4: Combined total of ESI-EA, ESI-EB, SLI-EA, SLI-EB and VMI-E ETUs cannot exceed 20. A maximum of 80 stations, of which, a maximum of six can be EDE-30-( ) consoles.

Note 5: When a Voice Mail system is connected to the Electra MarkII, MFR-EA ETU and RSG-E Unit may be required, depending on the model of Voice Mail system.

Note 6: When Modem Pooling and/or a Voice Mail system is connected to the Electra MarkII, an RSG-E Unit and MFR-EA Unit may be required.

Note 7: Combined total of CO/PBX, and E&M Tie lines cannot exceed 40. COI-EB ETU’s support Centrex ring patterns.

Note 8: A CPU-EC4 (or higher revision level) ETU is required to support two VMI-E ETUs, otherwise, only one VMI-ETU may be installed.

200-4

,

’

i

.’ /

’ 1