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A.2

Detailed Information

SECTION

APPENDIX

A.l

General Information and Definitions

Normally the SAP1626 serves the dual purpose of sig-

nal and DC power distribution. In general, the

SAP1626 connects between the system channels or

buses and

User Stations or strings of

User

Stations (normally to the

User Stations through

the BOP220). The system channels or buses are usu-

ally established by

Power Supplies. Often these

buses are also connected to an

800

series balanced

intercom system through a System Interconnect (e.g.

Models 862,860).

"wet" channel contains 32 volts DC and two-way

intercom audio.

"dry"

channel contains, two-way intercom audio

only.

User Station must be connected so that its

channel

connected to a "wet" channel; its channel

2 may be connected to either a "wet" or

"dry"

channel.

(Exception: Local powered

User Stations

can

arbitrarily connected to wet or

dry

channels).

The top row of switches on a SAP1626 connect to the

channel one inputs of

User Stations and should

always be dialed to a "wet" channel. (Exception: If

all

stations are local powered, dial up

can

be arbitrary).

.,.

The bottom row of switches

can

be arbitrarily dialed

any

channel. Dialing to channel zero connects the

User Station/StationsY channel two connection to

ground (dead channel).

The SAP1626 Power Supply Inputs

can

be connected

to one,

two,

three, or four three channel power sup-

plies to get three, six, nine, or twelve "wet" channels,

respectively.

On the SAP1626, Channels 13, 14, and 15 are always

dry, and, in general, the top row of switches should

not be left on these channels, because an unpowered

User Station could absorb some of the Intercom

or Program Audio that may appear on these channels.

Connect each of the four-pin INTERCOM CHAN-

NEL INTERCONNECT Connectors on the SAP1626

rear panel to a

three channel Power Supply (for

wet channel operation) or a termination plug (dry

channel operation). Connect the two

frfty

pin con-

nectors to a Model BOP220 or equivalent using two

50-conductor ribbon cables.

Regarding the four-pin cable assemblies: One to four

cable assemblies required for connecting one to four

Power Supplies respectively. There are two types

of cable assemblies: one for the Early* PS30/PS60

power supplies and one for

all

the rest of the

Power Supplies:

The Late* PS30

The PS31

The PS50

The Late* PS60

Figure A-1 below shows early PS30/60 cable assembly

wiriig.

Figure A-2 below shows the connection of four Early

PS30/PS60 Power Supplies to the SAP1626.

Figure 2-1 above shows the connection of four sys-

tem-standard type Power Supplies (PS31, PS50, Late

PS30/PS60) to the SAP1626.

Figure

2-2

above shows the system-standard PS31,

PS50, and Late PS30/60, Power Supplies cable as-

sembly

wiriig.

14.22

Special Note on Models

PS30

and

PS60

All

Model PS30/PS60's have six "internal" or "local"

channels (versus "system" channels or "buses"):

three powered and three unpowered or

"dry",

available on four

pin output connectors

(5101, J102,J106,J107).

The powered channels are on channels 1,3,5;

the

dry

channels, 2,4,6.

Ear!y yd late production PS30/PS60 power sup-

plies

differ

their connections, explained below.

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