Variable Features; Bypass Switch And Indicator Assemblies For 33 Type Sets - Teletype SA110 Description And Operation

(
(
t-
(
open test contact between terminal 7 (the col-
lector of
Q6)
and ground, the relay may be
energized momentarily by closing this contact.
4. VARIABLE FEATURES
4. 01 Versions of the SA110 are available for
installation on 33 or 35 type receivers,
DATASPEED Type 2 receivers, or other equip-
ment. For ~ach type of terminal two or four
optional bypass switch or indicator assemblies
~re available (Table A and Figure 2) which are
connected to the SAl 10 chassis
by
a cable. Those
for 33 and 35 type terminals mou~t adjacent to
the call control unit or copyholder, while those
for DATASPEED Type 2 receivers have magnetic
bases for mounting on top of the cabinet.
4. 02 Three of the optional assemblies
(TP327631, TP327633, and TP327640)
provide a bypass switch only. They are used in
applications in which a line. break on a half-
duplex line or on reverse channel is generated
whenever an error is detected. Bypassing the
accessory with the switch is necessary for the
terminal to receive messages from nonparity
senders. One assembly (TP327639) provides a
bypass switch and indicator lamp to notify t.he
operator of the receiving station that an error
has been detected (a break cannot be generated
BYPASS SWITCH OR
INDICATOR ASSEMBLY
TP327631 OR TP327632
IVORY LID
ISS 1, SECTION 578-200-100
when this assembly is used). The other as-
semblies all provide a bypass switch, indicator
lamp, and error counter (either low or high
speed) to enable the receiving operator to de-
cide - on the basis of the number of errors
counted and the length and content of the
message - whether to accept the message or
request a retransmission. These assemblies
are also useful for maintenance purposes, since
they allow transmission errors to be dis-
tinguished from machine errors.
Note: When the low speed counter is used in
high speed operation (SA110 EB), only the
number of widely~ separated individual errors
or error bursts will be recorded. The count
registered may be as low as 15 percent of the
number of errors detected by the SAll0.
'
BYPASS SWITCH AND INDICATOR ASSEMBLIES
FOR 33 TYPE SETS
4. 03 'Assemblies TP327631 and TP327632 are
designed to be mounted on 33 type ASR,
KSR, or RO sets. They are attached to a bracket
which clips on the cover.underneath the ivory lid
and hooks around on the bottom edge at the rear
(Figure 7). A single cable connects the assembly
to the SA110 chassis which is placed inside the
stand or mounted on an adjacent wall or table.
COVER
CABLE
TP327628
SAll0 CHASSIS
Figure 7 - Location of SAllO Chassis and Bypass SWitch or
Indicator Assembly on 33 Type Set
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