Octel XC1000, Service Manual

Page: 52 / 889

SITE PREPARATION
2-19 Edition One XC1000 Service
2.6.3.1 SMT Connections.
The SMT is normally connected to the XC1000 at the
J50 connector on the distribution board, using a male-to-male DB25 cable.
The RS-232-C interface uses pins and signals listed in Table 2-9.
Table 2-9. RS-232-C Pins for the SMT.
Pin Abbreviation Name
1 GND Ground
2 TD Transmit data
3 RD Receive data
7 SG Signal ground
In addition to the primary SMT port (J50), serial ports J43, J44, and J46 can
be configured for secondary SMT connections for XC1000s using software at
Release1.5X and newer. The primary SMT port is a data-circuit-terminating-
equipment (DCE) connector. Because J43, J44, and J46 are data-terminal-
equipment (DTE) connectors, a null-modem adapter must be used with the
connectors. Any of these connectors can be used, but the XC1000 can
support only one primary and two secondary SMTs.
2.6.3.2 Data-Link Connections. Three RS-232 connections J44, J43, and J46 are
provided on the main distribution board for integration. The connections also
can be used for secondary SMTs. Table 2-10 lists the pin assignments.
Table 2-10. Connector-Pin Assignments for RS-232
Data-Link Connections J44, J43, and J46.
Pin No. Description
1 Ground
2 Transmit data
3 Receive data
5 Clear-to-send (CTS)
7 Monitor (signal)
ground
8 Data carrier detect
20 Data terminal ready
When more than three data links are required, use the ACP (section 2.6.4).
2.6.3.3 External-Alarm Connections.
Alarm relay dry-contact closures for out-of-
service (OOS), service-affecting (SA), and non-service-affecting (NSA) alarms are
located at connector J25. These relay closures can be used to activate audible
or visual alarm indicators. The dimensions to the data-link and external-alarm
connections are shown in Figure 2-10. An Amphenol connector is used to
connect external alarms.
SECTION 2.6