Verilink AS100 (896-502379-001) Product Manual - Manual (Page 105)

Access System Centum Series User Manual C-1
Appendix
C
Special Serial Port Cabling
External Timing
If “External” timing is required to satisfy a particular application, Serial
Port #1 must be used (Worksheet Item #18) and Serial Port #1 must
supply the master network timing (Worksheet Item #12). The worksheet
can be found on page 3-2.
External timing is used if the attached customer equipment is a DCE
instead of a DTE. The customer DCE must be configured so that its
Receive Clock is used for BOTH transmit and receive functions. This
clock is also delivered to the Serial Port’s External Clock input and drives
the Centum Series transmit function. Transmit and Receive Data must
also be reversed.