NEC TTS 26B User manual

NSTRUCTION

MANUAL

FOR

MODEL

TTS

PULSE

SIGNALING

TEST

SET

ISSUE

NORTHEAST

ELECTRONICS

CORPORATION

BOX

649

CONCORD,

03301

PROPRIETARY

NOTICE

The information contained in this publication is

the

of Northeast Electronics Corporation and may not be reproduced

or used for manufacturing purposes or disclosed to third parties

without the written permission of Northeast Electronics Corpor-

ation.

WARRANTY

NEC warrants all products manufactured or sold by NEC to

be free from defects in materials and workmanship, subject to

the following terms and provisions.

NECts obligations under this warranty are limited to repair-.

ing, adjusting, or replacing at our option,

with

reasonable prompt-

ness, any NEC product which shall

within

twelve

(12)

months after

delivery to the original purchaser, and after normal and proper us

age, prove to

defective on NEC inspection, provided that the

purchaser shall

have

reasonably inspected products when received

and notified NEC of any apparent defects discovered

within

fifteen

(15)

days of receipt of shipment. NEC shall not be liable for any

manufacturing costs of the buyer, lost profits or good

will

of the

buyer, or any other special or consequential damages sustained

or expenses incurred

the buyer by reason of the ilse or sale

of any defective NEC product.

No products may be returned to NEC except

with

our written

permission. After receiving NEC factory authorization, material

requiring repair

replacement should

sent prepaid to the fac-

tory accompanied by a written statement setting forth as comphte-

ly ae possible the defects and the conditions under which they occur-

red. Material delivered by NEC shall not be considered defective

satisfactorily Wills

the

buyer's performance requirements

and/or is

accordance wi%-approvedsamples. NEC8sobligations

on performance of products delivered shall be limited to comply-

ing

with

specifications

accompanying a purchase order or

dth

pub-

lished epecifications on standard catalog items. This warranty does

not extend

any

NEC

products which

have

been subject to misuse,

neglect, accidents or improper installation or applications, nor

shall it extend to units which have been repaired or substantially

altered outside the NEC factory, nor to any associated instruments

equipment6 or apparatus. This warranty is in lieu of

all

other war-

ranties, express or implied.

TTS 26B

Section

Figure

3-1

-2

3-3

3-3a

3-3b

3-3c

TABLE OF CONTENTS

Title

GENERAL DESCRIPTION

SPECIFICATIONS

OPERATING INSTRUCTIONS

CIRCUIT DESCRIPTION

MAINTENANCE

ELECTRONIC PARTS LIST

LIST OF ILLUSTRATIONS

Title

Front Panel Controls

Send Circuits

Receive Circuits

Meter Circuit

Supervisor Monitor Circuits

TTS 26B Block Diagram

TTS 26B Schematic Diagram

Component Location

E95075

Component Location E95026

Page

2-1

3-1

5-1

6-1

Page

-2

3-8

3-12

3-18

3-23

TTS

26B

SECTION

Section 1

1.1

GENERAL.

1.2 The Model

TTS

26B

is a compact pulse sig-

naling test set designed to send pulses generated

by either a built-in. transistorized oscillator or an

external source, and to measure the

'36

break and

speed of the transmitted pulses, or of pulses

received from external sources. The

break of

the pulses transmitted by the instrument can be

varied over a wide range. The speed of these

pulses can be varied in seven discrete steps.

Signals can be received or transmitted on a

loopor an

E&M

basis.

seriesof jacks isprovided

for the proper connection to the particular circuit

to be tested. Switches and keys permit the test-

man to set

testing circuits for different combin-

ations of sending and receiving on the basis of

loop,

E&M,

or a combination of both signaling

sys

terns.

1.4

The

Model

TTS

26B

may be used as a pulse

repeater or converter. Signals from

external

circuit may be applied to the EXT

DIAL

jack or

terminals and used to operate the internal pulsing

relay. The

OJo

break of this output signal can be

varied, and it can be retransmitted on a loop or

%&M

basis. It can be used to control external

circuits such as voice-frequency signaling circuits,

polar duplex circuits, etc.

Measurements may

made by connecting

the high impedance meter circuit to the circuit

under test either directly or through a low imped-

ance "slave" relay. The meter slave relay

particularly useful when testing circuits which

have high capacitance or inductance. Such circuits

might distort the pulse wave shape and thereby

result in erroneous meter readings if the high

impedance meter were used directly on the cir

cuit under test.

1.6 The meter has

two

scales

one for measur-

ing

OJo

break and the other for pulse speed mea-

surements in pulses per second

(PPS).

The

correct scale is obtained

switching the meter

circuit to correspond to the selected mode of

operation.

1.7 The TTS

26B

may be operated from the

48-volt central office battery or from

suitable

substitute such

NEC

PSI01

In emergen-

cies

a heavy duty 45-volt dry cell will supply

adequate power to the instrument for a shorttime.

The set is contained in an aluminum carrying

case with a removable, hinged cover which inclu-

des

storage compartment for cords, small

tools, and such items.

1.9 Accessory covers are available to provide

additional functions which increase the versatility

of the Model TTS

26B.

These can be substituted

for, or ordered in place of, the removable cover

which normally

supplied with the set.

separate description of each of the cover acces-

sories is supplied as supplementary information.

relay rack mounted version of the TTS

26B

available in the form of the

TTS

26BDR.

TTS 26B

SECTION

SPECIFICATIONS

2.1 GENERAL.

Section

Table 2- 1 Lists the specifications of the TTS 26B

TABLE

2-1

METER

Ranges

Break: 070 to 100'70

Speed: 0 to 25 pps

Scales

O/o

Break: 170divisions

Speed

1 pps divisions

IMPEDANCE OF MEASURING CIRCUITS

Meter Circuit: Approx. 7,50052

Meter Relay: Approx. 40052

FOR SPEED MEASUREMENTS

Approx. 4,30052

SEND SIGNALS

Internal Oscillator: 4,6,8,10,12,

14,20 ~ulses/~ec.One addi-

tional frequency can

installed

on special order.

External Dial:

standarddialor20pps

dial may be used to generate

pulses

Break Range: At least 12%to 8570

Transit time <1 millisec.

CONTROLS

ADJ

BREAK

METER CAL

METER CIRCUIT Switch

FUNCTION Switch

PULSES PER SEC Switch

RECEIVE Switch

SEND Switch

EXT DIAL CIRCUIT Switch

SEND and TEST Key Switch

TWD-L Key Switch

TWD-D Key Switch

SEND Turnbutton Switch

SPARK

SUP

Turnbutton Switch

DROP

=G&O

-B&O

DROP E =G&B

=B&O

Toggle Switch

JACKS

1. EXT DIAL

2. SEND RELAY

SEND 1 (LOOP)

4. SEND

(LOOP)

SEND B&G

6. REG LOOP

REC

E&M

8. E

10. LINE

11. DROP

12. 48VoltS(-) T(+)

13. 48 Volt S

(t)

(-)

14. EXT ADAPT (FOR ACCESSORIES)

15. DROP

=G&O M

=B&O

DROP

=G&B M =B&O

SUPERVISORY LAMPS

LINE (E)

DROP

(M)

POWER REQUIREMENTS

48 volts

DC,

220mA

Operable from approx. 40V to

55V

Diode protection for polarity reversal.

24 volt DC operation available on

special order.

SIZE

14"w

10"h x 8"d (includes cover)

WEIGHT

5 pounds

RACK MOUNTED EQUIPMENT

The Model TTS 26B is also available

for bay mounting; it is called Model

TTS

26BDR. It includes a telephone

dial as well as all the features of the

portable set.

Any of the accessories available

for the cover of the TTS 26B can be

supplied on panels for bay mounting.

Ordering information will be supplied

on request.

TTS

26B

Section

Figure

3-1.

Front

Panel

Controls

TTS 26B Section

SECTION

OPERATING INSTRUCTIONS

3.1

GENERAL.

3.2

Table

3-1

lists the functions of all controls and indicators shown indexed on fig.

3-1.

Paragraphs

3.3

through

provide the operating instructions.

TABLE 3-1

Index No. Control or

Indicator Function

SEND PPS Switch

Provides the following functions:

1. Switches the power on or off.

2. Controls the pulse rate of the internal oscillator for

any one of the available seven discrete pulse rates.

ADJ

BREAK Provides the means for adjusting the

break of the

POTENTIOMETER transmitted pulses from the internal oscillator or from

an external dial.

METER CAL Provides the means for calibrating the meter circuitry.

POTENTIOMETER

FUNCTION SWITCH Provides the following functions in clockwise sequence:

SEND a. ON HOOK

b. OFF HOOK

SEND AND

REC

CAL a. ADJ

170

BREAK

b. CAL METER

RECEIVE Switch Provides the following receive functions in clockwise

sequence:

B&G

ON LOOP

LOOP

B&O

(M)

G&O(E)

The final clockwise position permits the SEND or SENE

AND

REC switch to control both sending and receiving

functions, as shown in item

following.

Section

TTS

26B

TABLE 3-1

Index No. Control or Function

SEND or SEND AND Provides the following,sending modes in clockwise sequence,

RECEIVE switch when the receive switch is in final clockwise position:

SEND LOOP, REC G&B

SEND LOOP, REC LOOP

E&M

LINE

DROP G&Oon E

E&M LINE B&Oon M (See Note

NOTE 1: The

lead status

this mode is controlled

the

DROP

toggle switch.

NOTE: The two SEND LOOP positions provide identical

sending conditions; only the receiving functions

are different in these positfons when this switch

is used to control both sending and receiving

functions.

METER CIRCUIT Provides the following measuring functions inclockwise

switch sequence:

0-25

PPS (Pulse Speed)

BREAK DIRECT

BREAK T-HRUMETER RELAY

EXT DIAL CIRCUIT Provides the following modes of operation of the external

switch dial circuit in clockwise sequence:

1. TALK

DIAL RELAY B&G

DIAL RELAY a. LOOP

c. E

FUNCTION key switch Provides the following functions:

TEST L&D(operated upward) This position disconnects

the LINE and DROP, and the

and

jacks from access

other circuits of the set. The LINE

(E)

and DROP (M) lamp

relays are bridged on, and the LINE and DROP jacks are

connected together tip to tip and ring.to ring.

2. SEND DIAL (position normal)

SEND OSC (operated downward)

TTS

26B

Section

TABLE 3-1

Index No. Control or Function

Indicator

10 LINE

(E)

key switch Provides for the connection of the following supervisory

and measurement functions toward the line:

1. ON HOOK (operatedupward)

MONITOR (norma1 position)

OFF HOOK (operated downward)

DROP (M)key switch Provides for the connection of the following supervisory

and measurement functions toward the line:

1. ON HOOK (operatedupward)

2. MONITOR (nor

ma1

position)

OFF HOOK (operated downward)

SEND turnbutton switch Provides the following SENDfunctions on the LOOP SIGNAL-

ING jacks SEND 1 and SEND

1. SEND RT ON 1&2(operated clockwise)

SEND SLEEVES (operated counter clockwise)

In normal use this switch should be in the SEND RT

1&2

position. The pricipal use for the SEND SLEEVE position

for special applications where direct access to the SEN1

relay armature, make, and break contacts is desired

SPARK

SUP

turnbutton Inserts an internal spark suppression circuit across the

switch SEND RELAY CONTACTS.

DROP toggle switch Determines the sending status of the

lead, either ground

and open or ground and battery.

Jacks The following 310-type jacks are provided from left to right:

EXT

DIAL (for connecting an external dial, pulsing

source, or a telephone set)

2. SEND RELAY (fordirectconnectionto the relaycontacts)

3. LOOP SIGNALING

SEND 1

LOOP SIGNALING

SEND

LOOP SIGNALING

SEND B&G

LOOP SIGNALING

REC LOOP

EAND

SIGNALING

REC E&M

TTS

26B

Section

TABLE 3-1

Index No. Control or Function

Indicator

15 (cont) Jacks

TERMINALS

LAMPS

18 METER

AND

SIGNALING

(for connection to the E lead)

AND

M SIGNALING

(for connection to the

lead)

10.

AND

M SIGNALING

LINE

11. E

AND

SIGNALING

DROP

12-

48 VOLT,

=BATT, T =GND

The following terminals are provided:

1. EXT ADAPT Connector

Provides for connection to

accessory covers (Located in upper left of panel).

EXT DIAL Binding Posts

(2)

Provides for connection

of an external dial, source of pulses, or of a telephone

set (located in upper left of panel).

GND

Binding Posts

Provides access to the

TTS

26B

ground.

Two supervisory lamps, designated

LINE

(E)

and DROP (M)

are provided to indicate a busy (lampdark) or

idle

condition

(lamps lighted) an the line and drop circuits to which the

set

connected, when E and M supervision

present on

the circuits.

Provides a display for all measurements.

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