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Looking from the front of the unit this is on the right two pins of both
jumpers. If you require MARK to be a ONE
the header for both JP5 & JP6 on pins 2 & 3. Looking from the front of the
unit this is on the left two pins of both jumpers.
Secondary Async Port CTS Forced or Follows RTS (JP4)
JP4 determines the source of the CTS signal on J3, the asynchronous
service port. To force the CTS to constant active, install the header on
JP4 pins 2 & 3. For CTS to follow RTS install the header on JP4 pins
1 & 2.
Clocking Modes (SW4-1,2,3,4,5)
Clocking mode selection is provided by Switch 4, positions 1 through 5.
Only one switch position should be set to OFF at any time
Only one switch position should be set to OFF at any time
Only one switch position should be set to OFF at any time
Only one switch position should be set to OFF at any time
Only one switch position should be set to OFF at any time
Selecting more than one mode may result in erratic operation of the 2072
(CTS IC-G.703).
The G.703 Co-directional interface specification requires that the Data and
Clock will be provided by the same source. The 2072 (CTS IC-G.703) will
provide a clock for the data it sends to the central office PCM link. The
Central Office provides the clock for the data coming from the Central
Office on the PCM link to the 2072 (CTS IC-G.703). This arrangement is
fixed in the hardware and cannot be modified.
Clocking on the V.35 and X.21 interface however is very flexible and can be
configured to meet any need the user has. The follow descriptions along
with the diagrams explain all of the possible clocking modes available to
chose from.
Mode 1 (SW4-1 OFF,
The 2072 (CTS IC-G.703) provides both receive and transmit clock to a
DTE device connected on the V.35 or X.21 interface. The receive clock
provided on the PCM channel is used to generate all outgoing clocking.
Data passes through both the TX BUFFER and the RX BUFFER using the
PCM RX TIMING for both input and output clocks.
TX TIMING
D
TX DATA
T
RX TIMING
E
RX DATA
OFF, 2, 3, 4, 5 ON
OFF,
OFF,
ON
ON)
ON
OFF,
ON
TX BUFFER
RX BUFFER
ONE on the G.703 interface, place
ONE
ONE
ONE
TX TIMING
TX DATA
RX TIMING
RX DATA
2-3
180001UA
.
PCM
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