Specifications

X723-300151 4-1 Issue 2
4 Management Configuration
4.1 Introduction
The multiplexer may be controlled either locally by a terminal connected
to its local RS-232 port or by a Network Control System (NCS) connected
to the V.28 network management port. If the 3200 to which the NCS is
connected is fitted with redundant system controllers, alarm panel DT245
must be fitted to allow the NCS to work with the standby controller.
Access to spare bit capacity in TS0 is provided for networking and remote
control.
NCS operates a poll and response type of system. Only the node that has
been polled by NCS will respond. Normally NCS traffic is carried through
the network in the TS0 of Not Frame word (NFW) spare bits 4, 5, 6, 7. In
resilient networks, it is usually necessary to have at least 2 routes
through the Network to reach a node. These are referred to as the A and
B polling branches. Traditionally, the A branch uses NFW bits 4 and 5,
whilst B uses 6 and 7. In order to avoid the NCS seeing its own polling
number under loop conditions for example, the patchfield arranges for the
polls to be transmitted in bits 4 and 6, whilst the responses from the nodes
are carried in bits 5 and 7.
The multiplexer system controller and Dual LIU are equipped with
firmware patchfields. Each of these contain 7 pre-programmed patchfields
which are available for the user to select on a per configuration basis. The
required patchfields are selected for the 14 management configurations
using the 'Install' menu. (see Section 5.3.4.).
The system controller patchfield deals with the routing of management
data between the backplane management bus ('M' bus), the V.28 Network
ports and the system controller management UARTS, while the LIU
patchfield deals with data between 'TS0' bits and the management 'M'
bus.
All cards in the multiplexer are linked by a bi-directional management
‘Wired OR’ bus. Up to 4 bits are available on the 'M' bus, termed M1 to
M4, these may be accessed by the Dual LIU and/or system controller