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DGS Components
Operation
,
After receipt of a positive acknowledgement or two successive bad mes-
(Cont'd)
I
sages and a negative acknm\'ledgement, the Line Concentrator (h'ops this
I
Input Station connection and proceeds to service the next Input Station
in line. The transaction is completed within a maximum of 10 seconds,
however, normally much less time is required.
Physical Characteristics
DATA GATHERING
SWITCH UNIT MODEL
70/327-2
The Line Concentrator is connected to its receiving buffer \'ia two sets
of twisted pair metallic voice grade lines
(1
pair per trunk) conforming
to the AT&T Schedule 4 Type 4A line specification or its equivalent. It may
be located up to 15 wire miles from the receiving DGS buffer.
•
The DGS Line Concentrators consist of a single wall mountable cabinet
which contains solid state control logic, power supply, control panel, and
a line termination panel. An illuminated white Power On indicator and
a circuit breaker are located on the front of the cabinet. The two models
have the following dimensions and weight:
Model
Height
Width
Depth
Weight
(inches)
!inches}
(inches)
IIbs.}
6381
23
22
9
55
6382
23
22
9
60
Both models operate within a temperature range' of 30°F and 110°F
and a relative humidity range of
59c
to
95)~.
•
This unit is designed to facilitate switching of communication lines
between alternate buffers. It operates with the Spectra
70/350
Switch
Controller and the Spectra 70/356 Communications Switch Adapter.
LINE
CONCENTRATOR
BUFFER
~
r -
~
r -
r--
DGS
SWI TCH
UNIT
- - - - - -
I
I
I
I
r------
L ___ _
BUFFER
Figure 12. DGS Switch Unit for Backup
24
PRIMARY
CCM
CPU
"
MASTER
SWITCH
CONTROLLER
STANDBY
CCM
CPU
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