Switches S1-1: Test Mode Activation
Use Switch S1-1 to enable or disable the Model 2070/Dx Test
Mode. When enabled, the Local Line and G.703 loopback tests are
activated simultaneously. When disabled, the Model 2070/Dx functions
normally.
S1-1
Activation
Description
On
Enabled
Local Loop and G.703 Loop
diagnostics enabled
Off
Disabled
Local Loop and G.703 Loop
diagnostics disabled
Switch S1-2 : Clocking Mode
Use Switch S1-2 to set the system clock for the Model 2070/Dx.
When using two Model 2070s together in a point-to-point application as
short range modems, set one unit for Internal clock and the other unit
to Network clock. When connecting directly to the G.703 network, set
the unit to Network clock.
S1-2
Clocking
Description
On
Network
The G.703 network
provides the system clock
Off
Internal
The Model 2070/Dx provides
an internally generated
system clock
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MODEL 2070/Dx SWITCH S1 SUMMARY TABLE
Position
Function
Factory Default
S1-1
Test Mode
Off
Disabled
S1-2
Clock Mode
On
Network
S1-3
Byte Timing
On
Enabled
S1-4
Reserved
Off
Switch S1-3: Byte Timing
Use Switch S1-3 to enable byte timing on the Model 2040/Dx. The
Byte timing clock is an 8 KHz (1 byte/sync. pulse) framing clock
synchronized to the G.703 Data.
S1-3
Activation
Description
On
Enabled
Model 2070/Dx outputs Byte Timing
Off
Disabled
Byte timing is disabled
Switch S1-4: Reserved for Factory Use
Switch S1-4 is reserved for factory use and must remain in the
Off position.
S1-4
Activation
On
Not a Valid Setting
Off
Normal Operation
3.4.2 Jumper Strap “JP1” and “JP2”
The Model 2070/Dx uses two jumper straps (JP1 and JP2, see
Figure 13 below) to select the power source option and to connect the
unit signal ground to frame ground.
.
Figure 14 (following page) shows possible settings of jumper straps
JP1 and JP2. JP1 may be positioned on pegs 1 and 2 or on pegs 1
and 3; JP2 may be positioned on pegs 4 and 6 or on pegs 5 and 6. A
detailed description of each jumper strap follows Figure 14.
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Figure 13. Location of Strap JP1 and JP2 on the top of the Model 2070/Dx PC board
Jumpers JP1 & JP2
1
3
5
2
4
6
Содержание 2070 Series
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