© 2006 Cronyx
1
Chapter 3. Operation
DTE Emulation
There are two input clock sources for receive and transmit data (ERC and ETC) used by
connecting the E1-L device to DCE via RS-232, V.35, RS-530 digital port in synchronous
mode.
If internal oscillator of the E1-L modem is chosen as a clock source then conformance
of output phase jitter and frequency accuracy to the appropriate ITU-T recommenda-
tions is guaranteed by the design the E1-L modem. If clock signal is originated from the
device connected to the digital port of the E1-L modem («Transmit clock: From Port»
mode) then it is necessary to ensure that its parameters are in conformance with the
ITU-T recommendations.
DTE emulation, external transmit clocks
The «Receive clock: Receive» mode is used when connecting to DCE devices receiv-
ing external clock signal (ETC) from the digital port. In this case the pair of devices
connected by digital ports (RS-232, V.35, RS-530, X.21) translates the clock frequency
transparently.
RXC
TXC
RXD
RXD
TXD
ETC
ETC
TXD
TXD
RXD
RXC
Summary of Contents for E1 - L/S
Page 50: ...50 Modem Converter E1 L S 2006 Cronyx ...
Page 51: ... 2006 Cronyx 51 ...
