SB-4170 /TT Switchboard

Description

The SB-4170/TT is a 12 line manual switchboard. It can be used with 12 2-wire lines or 6 4-wire lines. It supports either dial or touch tone signaling.

Prime power is 28 VDC using a KPT08F14-18SW connector where pin U and +28 VDC on pin J. There are also 3 jumpers in the power connector: B to D, K to L, M to N. As received the wiring inside the power connector cable was very bad and if powered up may have shorted out the 28 volt supply. All the wiring in the connector needed to be redone.

Front Panel

Cards

Slot
Slot Type
Card

J1
Crosspoint
empty

J2
Crosspoint empty

J3
Crosspoint empty

J4
Crosspoint A1 Crosspoint

J5
Crosspoint A1 Crosspoint

J6
Crosspoint A1 Crosspoint

J7
Channel
Front Panel Connector

J8
Channel A17A1 NR1

J9
Channel A17A2 NR1

J10
Channel A2 Magneto Line Trunk

J11
Channel A3 DCC Trunk

J12
Channel A7 CB/CBS Line Circuit

J13
Channel A8 4 Wire Trunk

J14
Common
A6 Common

J15
Common Front Panel Connector

J16
Common A4 CPU

J17
Common A5 CPU Interface

J18
Power Supply
(DB-25) Power Supply & Keyboard

Rear Panel

Power Supply & Operator's Keyboard

I'm guessing the power supply can work from 110 to 240 VAC @ 50 or 60 Hz (F1 and/or F2) or from 10 to 30 VDC (F3).
It's modular construction.

The keys with letters are for call precedence in order from highest to lowest:

FO = Flash Override

F = Flash

I = Immediate

P = Priority

R = Routine

C = Conference

PS1A4 Talk battery supply?

PS1A2 System voltages power supply?

PS1 chassis with modules removed

PS1A3 Ring HV supply

Rear of PS1

Connectors

Description
SB-4170/TT
ID
Cable

AC/DC Power W1A2J1 GC 07A14-19P
MS3116E-14-19SW

A stock connector has
the wrong keyway rotation

Expansion

24-61
(shell O.D. 1.496", 38.26mm)
?

Remote

25-00009-22-55SW
?

Power Connector Pin Out

Pin
Description

A, B
to transformer 1

C
to transformer 3

D
to transformer 2

E, F
to transformer 4

G
Fuse 1 (1A) center only switch ON

H
Fuse 2 (1A) center only switch ON

J
Fuse 3 (3A) center only switch ON

K
U1

L

M

N

P
Fuse 1 (1A) outer

R
Fuse 2 (1A) outer

S, T, U, V
chassis ground

Transformer 1 to 3: 6.6 Ohms DC
Transformer 2 to 4 7.6 Ohms DC

SB-22 Military manual switchboard
Panasonic KX-TA824 small business hybrid PBX
Phones - military, civilian
Cell Phones

Slot	Slot Type	Card
J1	Crosspoint	empty
J2	Crosspoint	empty
J3	Crosspoint	empty
J4	Crosspoint	A1 Crosspoint
J5	Crosspoint	A1 Crosspoint
J6	Crosspoint	A1 Crosspoint
J7	Channel	Front Panel Connector
J8	Channel	A17A1 NR1
J9	Channel	A17A2 NR1
J10	Channel	A2 Magneto Line Trunk
J11	Channel	A3 DCC Trunk
J12	Channel	A7 CB/CBS Line Circuit
J13	Channel	A8 4 Wire Trunk
J14	Common	A6 Common
J15	Common	Front Panel Connector
J16	Common	A4 CPU
J17	Common	A5 CPU Interface
J18	Power Supply	(DB-25) Power Supply & Keyboard

Description	SB-4170/TT	ID	Cable
AC/DC Power	W1A2J1	GC 07A14-19P	MS3116E-14-19SW A stock connector has the wrong keyway rotation
Expansion		24-61 (shell O.D. 1.496", 38.26mm)	?
Remote		25-00009-22-55SW	?

Pin	Description
A, B	to transformer 1
C	to transformer 3
D	to transformer 2
E, F	to transformer 4
G	Fuse 1 (1A) center only switch ON
H	Fuse 2 (1A) center only switch ON
J	Fuse 3 (3A) center only switch ON
K	U1
L
M
N
P	Fuse 1 (1A) outer
R	Fuse 2 (1A) outer
S, T, U, V	chassis ground