CRS-300 1:10 Redundancy Switch

Revision 16

Modem, RMI/TMI, and Switch Configuration

MN/CRS300.IOM

5.2.4.5Switch to CDM-Qx/QxL Redundancy Configuration

The CRS-300-to-CDM-Qx/QxL redundancy configuration uses an external EIA-485 multi-drop communication cable.

The CDM-Qx/QxL can be configured many different ways, such as one to four modulators, or one to four demodulators, or a mix and one or modems. For a CRS-300 application, the CDM-Qx/QxL should be configured only as one modem: containing one modulator and one demodulator card, which must be grouped to act as a modem. See the CDM-Qx/QxL Installation and Operation Manual for more information.

As shown in Figure 5-1, Modem 1 resides in Slots 1 and 2. Modem 2 is contained in Slots 3 and 4. The Switch can use either modem.

Modem 1

Modem 2

Status Indication

(a) Front Panel

Prime Power & Control

Slot 1 Mod

Slot 3 Mod

Slot 2 Demod

Slot 4 Demod

IF I/O

(b) Rear Panel Schematic

Figure 5-1. CDM-Qx/QxL Serial Communication Configuration

The CDM-Qx/QxL chassis has a configurable EIA-485 (referred to on the menus as RS-485) base address – which applies for Modem 1 – and an offset, which is added to the base-address if addressing Modem 2. The RS-485 addresses are selected via the front panel menu: CONFIG Æ REMOTE.

The Switch addresses each CDM-Qx/QxL modem based on which TMI it is attached to, with addresses at increments of 100. For a Switch with address 0, a Qx on TMI 1 has address 0100, on TMI 2 address 0200, etc to address 1000 for TMI 10. The RMI uses address 1100. See Figure 5-2and Appendix B. ADDRESSING SCHEME INFORMATION for more information.

Once the addressing scheme is understood, proceed as follows:

Step Procedure

1Configure COMs on each modem via the modem front panel menu as follows:

CONFIG Æ REMOTE: RS-485-4W, 9600 baud, format 8-N-1.

2Set the RS-485 (EIA-485) base address and offset, per Appendix B. Addressing Scheme Information.

Refer to the CDM-Qx Installation and Operation Manual for detailed configuration information.

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Mocomtech CRS-300 Switch to CDM-Qx/QxL Redundancy Configuration, CDM-Qx/QxL Serial Communication Configuration