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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