
ET100 LAN-WAN Bridge
21
Sync Mode Clock Settings
Interface RS-530/449/232 or V.35 X.21
Signals TD(103) RD(104) TD(103) RD(104)
WAN TCLK
External
From
TC(114)
From
RC(115),S
WAN TCLK
Internal
Internal (Internal)*
WAN RCLK
External
From
RC(115)
From
RC(115),S
WAN RCLK
Internal
Internal (Internal)*
Table 11: SYNC Mode Clock Settings
* Because the ET100's WAN port is DTE, the X.21 clock sources for
transmit and receive are always issued from the DCE side S signal.
Setting the ET100's X.21 clock mode to internal is not recommended.
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