Installation guide

Hospitality systems 7-15
RSM functionality
Standard 2.0 Meridian Mail Mini and Enhanced Card Option May 2000
Installation and Maintenance Guide
RSM functionality
Introduction
The RSM Module assembly NTTK40AA is a metal box, that
carries the RSM printed circuit assembly (NTTK39AA). The
assembly is wall-mounted close to the Option 11C Mini PBX.
The connection to the PBX is made using a 90 cm (4 ft)
shielded cable (NTTK44AA).
The personal computer connections to ports 2, 3, and 4 are by
the customer-provided RS-232C cables. The recommended
cable for these ports is NTMW55AA.
An overview of all the major functions of the RSM board is
provided in the following sections.
RSM drivers and
receivers
The drivers, receivers, and relays are powered through the
Meridian Mail Mini. The Meridian Mail Mini card has two
85C30 Serial Communication Controllers (SCC). Both SCC
controllers provide four RS-232C serial ports capable of
operation at 9.6 Kbps. Ports 1 and 2 are capable of either
synchronous or asynchronous operation; ports 3 and 4 are
capable of asynchronous operation only. All the RS-232C drive/
receive lines are routed from the Meridian Mail slot via the
Option 11C Mini backplane, and terminate on a 50-pin MDF
Connector.
One end of a special shielded cable, NTTK44AA, is connected
to the 50-pin connector on the Chassis Expander backplane, and
the other end is connected to the P0 connector on the RSM
Module Assembly NTTK40AA.