CRS-300 1:10 Redundancy Switch Revision 16
Addressing Scheme Information MN/CRS300.IOM
B–11
B.3.1 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:
1. For CDM-570/570L, CDM-600/600L, CDM-625 modems:
Use OUS (Offline Unit Status) – OUS? for queries. This command/query is available in
the following modems/firmware versions:
Modem Firmware Version
CDM-570 1.4.1 or later
CDM-570L 1.3.1 or later
CDM-600 1.6.1 or later
CDM-600L 1.3.0 or later
CDM-625 1.1.1 or later
2. For CDM-Qx/QxL modems:
Use FLT (Faults and Status) – FLT? for queries. This co mmand/query is available
in available in firmware versions 1.6.2 or later.
Note: 1:1 internal redundancy in EDMAC Slave mode is available only in firmware
version 1.6.2 or later.
Refer to the appropriate modem’s Installation and Operation Manual for additional
information.