Nortel Networks 553-3001-211 manual Msdl operations

NT6D80 MSDL card Page 383 of 894

Equipment emulation mode – Configure an MSDL port to emulate DCE or DTE by setting switches on the card and downloading LD 17 interface parameters.

I/O port electrical interface – Each MSDL port can be configured as an RS-232 or RS-422 interface by setting the switches on the MSDL card. MSDL ports use Small Computer Systems Interface (SCSI) II 26-pin female connectors.

Figure 81 on page 384 shows the system architecture using the MSDL as an operational platform. It illustrates operation routing from the CPU, through the MSDL, to the I/O equipment. It also shows an example in which DCH operation peripheral software in the MSDL controls functions on ports

2 and 3.

MSDL operations

The system automatically performs self-test and data flow activities. Unless a permanent problem exists and the system cannot recover, there is no visual indication that these operations are taking place.

The system controls the MSDL card with software that it has downloaded. The MSDL and the system enable the MSDL by following these steps:

1When the MSDL card is placed in the system, the card starts a self-test.

2When the MSDL passes the test, it indicates its state and L/W version to the system. The CPU checks to see if downloading is required.

3After downloading the peripheral software, the system enables the MSDL.

4MSDL applications (DCH, AML, SDI) may be brought up if appropriately configured.

Circuit Card Description and Installation