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180001UA
Mode 2 (SW4- 2 OFF
The 2072 (CTS IC-G.703) gets its receive clock from a DCE device and
gives an external transmit clock to the DCE device connected on the V.35
interface. The receive clock provided on the PCM channel is used to
generate all outgoing clocking. Data passes through the RX BUFFER
using the RX TIMING for both input and output clocks. Data passes
through the TX BUFFER using the DCE TX TIMING for the input clock and
PCM RX TIMING for the output clock. This mode is not available for X.21.
RX TIMING
D
RX DATA
C
Ext TX TIMING
E
TX DATA
Mode 3 (SW4-3 OFF
The 2072 (CTS IC-G.703) gets the Signal Timing from the X.21 DCE device
connected on the DB-15 interface. The receive clock provided by the PCM
channel is used to generate transmit clock for data going to the PCM
interface. Data passes through the RX BUFFER using the PCM RX TIMING
for the input clock and Signal Timing from the X.21 interface for the output
clock. Data passes through the TX BUFFER using the Signal Timing from
the X.21 interface for the input clock and PCM TX TIMING for the output
clock.
D
RX DATA
C
SIGNAL TIMING
E
TX DATA
Mode 4 (SW4-4 OFF
The 2072 (CTS IC-G.703) gets an external transmit clock from the DTE
device and gives a receive clock to the DTE device connected on the V.35
interface. The receive clock provided on the PCM channel is used to
OFF
OFF
ON
ON
OFF
OFF 1, 3, 4, 5 ON
ON
ON)
TX BUFFER
RX BUFFER
OFF
OFF
ON
ON
OFF
OFF 1, 2, 4, 5 ON
ON
ON)
TX BUFFER
RX BUFFER
OFF
OFF
ON
ON
OFF
OFF 1, 2, 3, 5 ON
ON)
ON
TX TIMING
TX DATA
RX TIMING
RX DATA
X.21 ONLY
X.21 ONLY
X.21 ONLY
X.21 ONLY
X.21 ONLY
TX TIMING
TX DATA
RX TIMING
RX DATA
2-4
PCM
PCM
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