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END
Line Termination
Speed Selection
Controls and Ind icators
70/710 Telegraph Buffer
•
The buffer reports END whenever it completes the operations required
by each command as previously indicated. END is enabled only by a TERC
from the CCM.
•
The buffer is connected to the CCM line termination panel where tele-
graph lines are terminated. Telegraph line filters are supplied with the
buffer for installation on the line termination panel.
•
The buffer must be connected to the proper modulation rate
0
scillator in
the CCM at the time of installation. Speed selection is based upon the type
of communication facility connected to the buffer and the requirements of the
remote terminal(s). The buffer operates at the transmission speeds and
modulation rates as shown in table 4-1 according to the type of remote
terminal it is exchanging data with.
Table 4-1. Model 70/710 Remote Device Characteristics
Tel etypewriter
Code Level
Characters
Bits per Second
Terminals
per Second
(Modulation Rate)
Model 28
5
6, 7.5, 10
45.5,56.9, 75
Model 32
5
6, 10
45.5,75
Model 33
8
10
110
Model 35
8
10
110
•
The operator controls and indicators for the buffer are located on the
CCM control panel. They consist of the following:
Data (amber indicator) -
With a TC present, this indicator lights ex-
cept when a spacing bit is transmitted.
With an RC present, after the
first mark to space transition, this indicator lights except when a
spacing bit is received.
Select (patch panel) -
The buffer is easily connected to any CCM
Select (SEL) line, and is thereby enabled with power is on. When the
buffer is enabled, it responds to an SEL with BOP.
4-10
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