Nortel Meridian Meridian 1 Maintenance Manual page 18

6 Chapter 1: Overview
553-3211-510 Standard 1.0 October 1998
¥ MVME332XTS Asynchronous Communication Controller (ACC) card
This card provides eight RS-232 interface ports for connection of
terminals and printers. There are three LEDs on the faceplate of the
ACC card:
Ñ The red LED (Fail indicator) lights when a hardware failure
occurs on the ACC card.
Ñ The red LED (Halt indicator) lights steadily when the on-board
processor halts, indicating an ACC card malfunction.
Ñ The green LED (Run) indicates the activity level of the ACC card
by lighting dimly, brightly, or in pulsing mode. A dimly lit LED
indicates that the system is idle, meaning that no terminal
activities are occurring. A brightly lit or pulsing LED indicates
data transfer activities are taking place.
¥ MVME712A and MVME712AM transition cards
The MVME712A and MVME712AM cards provide four 9-pin
connectors (asynchronous serial ports 1Ð4) and a printer-port
connector. Additionally, the MVME712AM card provides an RJ11
port.
The MVME712AM card has a built-in modem and is used in countries
in which the modem is type-approved. The MVME712A transition
card, which does not provide a built-in modem, uses a locally-
approved external modem for remote maintenance.
The built-in modem in the MVME712AM card provides full duplex
operation over two-wire Public Switch Telephone Networks (PSTNs).
It operates in asynchronous mode at data rates of 300, 600, 1200, or
2400 bps.
This transition card also provides an Ethernet connection.
¥ MVME712M transition card
This card supports RS-232 ports and Ethernet and SCSI interfaces for
the SBC card.