RTS CIF-612 Specifikace stáhnout pdf (Strana 21)

SECTION

THEORY OF OPERATION

4.1 OVERALL FUNCTIONAL DESCRIPTION

(See Figure 4-1)

GENERAL The SAP1626 Source Assignment Panel

is a rack-mounted matrix switch. This switch assigns

each of 20

TW*

User Station strings to two of fifteen

possible buses. Twelve buses

can

distribute both DC

power and intercom signals. Three buses distribute

intercom signals or program signals. The matrix

switch has the effect of transforming a basic two bus

intercom system to a fifteen bus system. The switch

also assigns six camera intercom stations to a pair of

intercom/program buses or twelve camera stations to

a single intercom/program bus.

SAP1626 BUSES There are three kids of buses in

the SAP162.6: 1) two-way two-wire type intercom

buses,

DC powered two-way two-wire intercom

buses, and 3) program audio buses. There are twelve

primary intercom buses and three program or sec-

ondary intercom buses. All buses allow for two-way

two-wire intercom operation. The twelve primary

buses may also be "powered" buses. The powering

accomplished by plugging

type power supplies

into the SAP1626. The powering allows a

inter-

com station to receive power on its channel one wire

(one

of,.three wires connecting the

user station to

the SAP1626). Most

user stations require DC

power to appear across two of the three wires con-

necting it to a system. (The

stations that don't

require this DC power either have a

"Local

Power"

option or they are a special kind of

station.) The

two wires that accept DC power on a

station are

the common and [CHannel One] connections. This

means that, in general, the upper row of switches on

the SAP1626 should

set only to powered buses.

Up to ten user stations may be in a group of

user

stations connected to a SAP1626 output. The twenty

outputs discussed above are available on the back of

the SAP1626 on two fifty-conductor connectors, or on

the optional BOP220 as twenty three-conductor male

XLR type connectors.

PROGRAM BUSES The three program buses allow

three different program sources to be connected to

the

SAP1626. The

user stations

can

be assigned

these programs on their channel two connection

(bottom row of switches on the

SAP1626). If the

user station

assigned one of the program buses as

above but there

no program connected, the bus

can

then function as an intercom bus.

BUS

CONNECTIONS:

TO 12

On the SAP1626,

twelve intercom unbalanced powered or unpowered

intercom inputs are tied to SAP1626 thumbwheel

switch buses one through twelve via INTERCOM

CHANNEL

INTERCONNECT connectors, 5111,

5112, 5113, J114. Each connector ties three intercom

channels to three buses respectively. (See SD3871).

The contacts

can

handle a contact carrying current of

2.0 amperes and a contact breaking current of

0.5 amperes.

BUS CONNECTIONS: 13 TO

Three balanced

program inputs at the rear panel on connectors la-

beled "PROGRAM INPUTS"

(J105, J106, 5107) tie

to buses 13,14, and 15.

USER STATION CONNECTIONS The front panel

thumbwheel switches tie the EXTERNAL USER

STATION outputs to one of 15 buses. At the

BOP220 each XLR 3-32 connector ties to an upper

thumbwheel and a lower thumbwheel in a column, so

that a

user station plugged into one of these con-

nectors has its "Channel one and its Channel two se-

lected by a column of switches.select these 15 buses.

The "EXTERNAL USER STATION" switches con-

nect through two

50-conductor rear-panel external

output connectors, J101, 5103, which normally con-

nect via two 50-conductor flat cables to the BOP220.

The BOP220 wiring converts the two 50-conductor

connectors to twenty 3-pin XLR-type connectors.

Thumbwheel switches S13-S52 select channels for

EXTERNAL outputs labeled 1-20 on the

BOP220.

Odd numbered switches are top row and select inter-

com channel

Even numbered switches are bottom

row and select intercom channel 2.

Outputs from

these switches connect to rear-panel microribbon

connectors JlOl and 5103.

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