Section 2: Installation
Instruction Manual 8144-DD/075020
Page 2-3
2.2
SWITCH AND HEADER SETTINGS
The switches and headers determine the input alarm and clock termination,
reaction to loss of primary (A) and secondary (B) inputs, the waveshapes of the
DS1 outputs, whether a second clock input is used, and the latching of the alarm
lamps and relays.
A summary of the internal settings is below. A more detailed description follows
on subsequent pages.
HEADER FUNCTION
A
B
H1
B Alarm Termination
High impedance
1
120
ohms
H2
A Alarm Termination
High impedance
1
120
ohms
H3
B Clock Termination
100 ohms
1
High impedance /bridging
H4
A Clock Termination
100 ohms
1
High impedance /bridging
H7
B Input Alarm Enable
No B Input
B Input
1
H8
Major Alarm Indicator Latch Select
Latched
1
Not
Latched
H9
Minor Alarm Indicator Latch Select
Latched
1
Not
Latched
H10
Major Alarm Relay Latch Select
Latched
1
Not
Latched
H11
Minor Alarm Relay Latch Select
Latched
1
Not
Latched
H14
A Channel AIS Alarm Select
Alarm on AIS
1
No Alarm on AIS
H15
B Channel AIS Alarm Select
Alarm on AIS
1
No Alarm on AIS
H16 Switching
Priority
Non-revertive
1
Revertive with A Priority
H17
DS1 Output Framing Select
ESF
D4
1
SWITCH FUNCTION
S1
“B” Receiver Mode, factory test use only, place all switches OFF
1
.
S2
“A” Receiver Mode, normal operation, place all switches OFF
.1
S3 - S14
Transmit Length Selected, 0-133 feet, Switch 3 ON, Switches 1, 2 and 4 OFF
1
.
S15
Data Output Select
Factory Test
Framed all one’s
1
1
= Factory setting
TABLE 2-1 SWITCH AND HEADER SETTINGS SUMMARY
Refer to Figure 2-2, Component Layout, to locate and identify functions of the
internal switches and jumpers.
