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G.703 CODIRECTIONAL CONVERTER
Figure 2-2. G.703 Codirectional Converter signaling.
2.2.2 G.703 C
ODIRECTIONAL
T
IMING
The G.703 Codirectional Converter can support virtually all timing options
that you might need, as described and illustrated in this section.
G.703 Receive Timing Used for G.703 Transmit Timing
When G.703 receive timing is used for G.703 transmit timing, three timing
options for the data-communication side, associated with the loopback timing
(LBT) on the G.703 side, are available:
• Receive Clock and Transmit Clock are both outputs from the Converter,
which serves as a DCE (see Figure 2-3).
• Receive Clock and Transmit Clock are both inputs to the Converter
(with X.21 interface only), which serves as a DTE (see Figure 2-4).
• Receive Clock is an output from the Converter, while Transmit Clock
is an input to the Converter from an external DCE, for connection to
a tail circuit (see Figure 2-5).
G.703
Codirectional
Converter
