Patton electronic 1082/F user manual Timing Mode Selections, Network Replacement Configuration

The first G.703 modem is in Internal Clock mode. The second modem is in Receive Recover mode. See Figure 3.

RX

TX

CSU

DTE

G.703 INTF-	G.703 TX	HOST
MODEM	SMOOTHS	MODEM -
	RX MODEM	RECOVERED
TIMED MODE
	CLOCK	TIMING

	TX	FIFO	RX
G.703	RX	FIFO	TX

SECOND MODEM

G.703 TX SMOOTHS

RX MODEM CLOCK

RX

TX

G.703

TX	FIFO
RX	FIFO

SMOOTHED

RX

TX

2 Wire

CSU DTE

G.703 INTF- FIRST MODEM	HOST
MODEM	MODEM -
TIMED MODE	INTERNAL
	TIMING

Figure 3. Network Replacement Configuration

2.5 TIMING MODE SELECTIONS

Based on the timing arrangements and clock sources mentioned above, there are two timing modes in which the interface can work. These two modes select the clock sources mentioned above and determine which clock gets smoothed.

•Network Timed—This sets the interface to pass the smoothed recov- ered timing to the modem as XCLK1, with the Rx data as TXD1, and also to the G.703 Tx side.

•Internal/Receive Recovered—This sets the interface to use the modem’s Tx timing (recovered or internal source) to send the Rx data (as TXD1) to the modem and to smooth the modem’s recovered timing for transmitting on the G.703 Tx side.

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