Planning the Timing
Chapter 4: Getting Started
Page 4-16
VersaMux-4000 Operation & Installation Guide
Part No. 24001157
Revision C
shows the VersaMux-4000 receiving the master clock via the External
Clock Input as it does in
. The difference in this example is that the
VersaMux uses its system clock reference to clock out the Transmitted Data to the
DCE. In addition, it sends this Tx Clock signal to the DCE (Transmit Signal Element
Timing- DTE Source). Typically the DCE would receive the PRS from the same
external source as the VersaMux or it would use the VersaMux Tx Clock (DTE) as
its system reference. Note that the VersaMux uses the Rx Clock (Receiver Signal
Element Timing- DCE Source) to clock in the Receive Data
Figure 4-19
VersaMux-4000, DTE Mode, External Clock, TxClkSrc = System
External Input Timing, VersaMux = DCE
shows the VersaMux-4000 in DCE mode receiving the master clock via
the External Clock Input. In this example the VersaMux uses the master clock
reference for the DCE Tx Clock (Transmit Signal Element Timing- DCE Source) and
the Rx Clock (Receiver Signal Element Timing- DCE Source). With the
TxClkSrc
parameter set to
TxClkIn
, the VersaMux uses the DTE Transmit Clock (Transmit
Signal Element Timing- DTE Source) to clock in the Transmitted Data from the DTE.
Typically the DTE would receive the PRS from the same external source as the
VersaMux or it would use the VersaMux Tx Clock (DTE) or Rx Clock (Receiver
Signal Element Timing- DCE Source) to generate its system reference.
Figure 4-20
VersaMux-4000, DCE Mode, External Clock, TxClkSrc = TxClkIn
DCE Device
(IE: Satellite
Modem)
ClkRef
NRZ Interface
Transmitted Data
Tx Clock (DCE)
Tx Clock (DTE)
Rx Clock (DCE)
Rx Data
VersaMux-4000 (DTE)
Mode = DTE
ClkRef = Ext (1MHz, 5MHz, 10MHz)
TxClkSrc = System
Port Interfaces
Primary Reference Source (PRS)
DTE Device
(IE: Crypto)
ClkRef
NRZ Interface
Transmitted Data
Tx Clock (DCE)
Tx Clock (DTE)
Rx Clock (DCE)
Rx Data
Primary Reference Source (PRS)
VersaMux-4000 (DCE)
Mode = DCE
ClkRef = Ext (1MHz, 5MHz, 10MHz)
TxClkSrc = TxClkIn
Port Interfaces
