Remote Connection to MCU

Connecting the PC to the MCU

When the PC is located remotely from the MCU, the MCU’s modem pooling capa- bility is ideal for connecting the data link needed to support CRCS/OpCenter. With modem pooling, Hayes-compatible analog modems are used at the PC to connect over the PTSN to the MCU. The MCU implements an external 7400A data module combined with a 3800 modem running 9600 bps to provide conversion resources needed to route the analog voice calls from the CRCS to the digital Netcon chan- nels in the MCU.

There are two types of conversion resources for modem pooling. The first type, an integrated conversion resource, is a circuit pack which emulates a Trunk Data Module connected to a 212A-type modem. The MCU does not support the inte- grated modem solution.

The second type, a combined conversion resource, is a separate Trunk Data Module and modem administered as a unit. The Trunk Data Module component of the conversion resource may be either a Modular Trunk Data Module (MTDM) or a 7400A data module. The module connects to a digital port using Digital Commu- nications Protocol (DCP); the 3800 modem connects to an analog port on the TN746B.

The MCU supports the Combined Modem Pooling Solution for use in remote con- nectivity between the MCU and the CRCS module whenever these components are not collocated. See "Appendix A: Modem Pooling" for further installation details.

Connection Procedure

1.Connect the COM1 port to the 8400B/7400B data module with an appropri- ate adapter, if necessary, and an M25B (EIA-232-D) cord or equivalent. If using modem pooling, use an analog modem instead.

2.Use an RS232 cable (M25B) with a 25-pin female connector for the CRCS PC or server and a 25-pin male connector for the analog modem (remote connection) or data module (local connection).

3.If your supplied cable does not have the appropriate gender connectors, use a gender changer to make the adjustments.

4.PC ports are usually labeled with the port number and type (serial or paral- lel), if not see your PC user manual for proper labeling. If the first serial port is a 9-pin connector, connect a 9-pin-to-25-pin RS232 adapter (you sup- ply).

10 Issue 1 CRCS R6.0 April 1999

6 specifications

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