CANOGA PERKINS 2370 High-Speed Universal Fiber Optic Modem - Manual (Page 24)

EdgeAccess Universal Chassis System
Model 2370 Model User Manual 3-10
• Slave mode: This 2370 uses the clock from the remote modem as both the TD Timing and RD
Timing signals. Go to the Functional Configuration screen and set the interface configuration
values: set the interface type, then select Slave mode, then set the TD Timing source to SCT for
most applications or to SCTE, SCTE Sampled, or SCT Inverted for high data rates or a long cable
to the DTE. See Figure 7.
RX Data
RX Clock
Internal
Clock
TX Clock
TX Data
RXD
SCR
SCT
SCTE
TXD
INTERFACE MODEM MAIN BOARD
Slave Mode Without Turnaround Clock
SCT Used for TD Timing
SCR Used for RD Timing
RX Data
RX Clock
Internal
Clock
TX Clock
TX Data
RXD
SCR
SCT
SCTE
TXD
Slave Mode Without Turnaround Clock
SCT Inverted Used for TD Timing
SCR Used for RD Timing
INTERFACE MODEM MAIN BOARD
RX Data
RX Clock
Internal
Clock
TX Clock
TX Data
RXD
SCR
SCT
SCTE
TXD
INTERFACE MODEM MAIN BOARD
Slave Mode With Turnaround Clock
SCTE or SCTE Sampled Used for TD Timing
SCR Used for RD Timing
Figure 7. Slave Operating Mode
• Asynchronous mode: Use when a data signal is present without a separate clock signal. This
mode samples the data signal at 100 MHz, causing a 10 ns pulse distortion, which can affect high
data transmission rates.
For details on the Functional Configuration screen and configuring the parameters for various
interfaces, see Section 4.7.