Comtech EF Data CRS-500 - Manual (Page 213)

CRS-500 1:N Redundancy System Revision 2
Appendix C MN-CRS500
C–5
C.2.2 Setting Up Modems
•
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:
Use OUS (Offline Unit Status) – OUS? for queries. This command/query is available in the
following modems/firmware versions:
Modem Firmware Version
CDM-625 1.1.1 or later
CDM-750 1.4.3 or later
Refer to the appropriate modem’s Installation and Operation Manual for additional information.