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Power
Cord
2
\ IBM World Trade)
2740 2741
Commof'l Carrier
Data Set Coble
IBM Modems 3976
Models land
2
cable.
Figure 1,"),
IB~I
27·1O/27·n
Cables
IB:\1 27
-tu CO};FIGCRATIONS
An
IB~l
2i -10 Communication Terminal can be in-
stalled to communicate with other 27 -10's or a com-
puter, The terminal configuration can be either
point-to-point or multipoint.
18
1. Point-to-point: one 27 -10 is connected to only
one other 2740 (Figure 19) , or only one 2740
per communication line is connected to the
multiplexer of a remote computer.
2.
Multipoint: more than two terminals are con-
nected to the same communication line. Two
multipoint configurations are used:
a. Contention type: has several 2740iS con-
nected to the same line (Figure 20). The
first operator to press the bid key obtains
control of the line and his terminal becomr
r
a transmitter. The others are receivers
until the operator at the transmit terminal
presses the EOT (end of transmission) key.
b. Multiplexer Type: has several 2740's con-
nected to the same line which is also
con~
nected to the multiplexer of a computer
(Figure 21). The multiplexer selects tile
terminal to become the transmitter (because
only one can transmit at a time). All or se-
lected terminals can receive data from the
multiplexer~
Customer
Supplied
c::::ij~-
IBM Supplied
Power
Cord
3
118M
Line
~ ~d~p~e~
__
Adapter
Cables
(IBM Domestic)
2740·2741
2740 or
Multip1exer
Dota Set
or line
Adopter
Figure 19. Point-to-Point
Dato Set
Dota Set
or line
or line
Adopter
Adopter
?74()
2740
I
Doto Set
or
'line
Adopter
Figure 20. Multipoint-Contention Type
2740
Data Set
or line
Adopter
2740
The terminal can transmit to a computer, such as
the IBM System/3GO, by means of a 2701 Data
Adapter Unit,a 2702 or 2703 rransmission Con-
trol. or a 2712 Remote Multiplexer.
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