CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Appendix C Revision 19
C–11
C.2 Modem Setup
• Local Modem m, where m is modem position number (1 through 10) on Switch:
o MCA = (Switch RCA) + (100 x m)
o Set EDMAC Framing on.
o Set as EDMAC master.
o Set with EDMAC Slave Address Range, ESA = (Modem RCA) + 10
•
Distant Modem 1 (attached to the Distant end of link to Modem m):
o Remote control address: no setting required (Remote control not used).
o Set EDMAC Framing on.
o Set as an EDMAC slave.
o Set Slave Address, ESA = (Master ESA) + 1
o MCA = ESA
•
Two Distant Modems in a 1:1 configuration:
Set up the on-line modem as for Distant Modem 1, described previously in this section. The
offline modem is automatically configured to match the on-line modem. M&C can only be
achieved to the online modem.
Note: It is not possible for the offline modem of a 1:1 pair to respond to EDMAC messages
directly as it is not transmitting. Using the internal 1:1 link, the online modem polls and
retains the off-line modem status. Depending on the modem, this information can be
obtained as follows:
1) For CDM-625/A, CDM-570/A, CDM-570L/AL, and CDM-600/L modems:
Use OUS (Offline Unit Status) – OUS? for queries. This command/query is available in
the following modems/firmware versions:
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