Chapter 7
Timing, IRIG-B and Pulses
7.1 Introduction
This section should help you with understanding, choosing and connecting the correct outputs from
the Model 1084A/B/C series clocks to synchronize your external equipment, such as protective
relays. It should also answer some basic questions, such as:
• What are the different types of IRIG-B, and what are the differences?
• How do you connect multiple devices to one timing output?
• How far can you transmit timing signals?
• What type of cabling and connectors should I use?
The steps involved in getting your devices synchronized to the GPS are fairly simple and should
not take long to complete. To expedite the process, make sure that you know:
1. the type of timing signal each piece of equipment requires, and
2. how to enable the equipment to receive the timing signal.
Various methods are used to configure equipment for IRIG-B including setting a physical jumper, or
setup program. Some equipment can auto detect the timing signal, so that nothing else is required,
other than connecting the cable.
7.2 Timing Output Description
When viewing the rear panels of the Model 1084A/B/C, you will see that there are a number of
different types of connectors as illustrated in Figure 7.1. Generally, there is a power inlet connector,
a GPS antenna connector, two DB-9 serial connectors (one is an optional RS-232 port), two SPDT
relay connectors and three timing outputs. If required, space for an optional fiber optic port with
type ST connector is available. Finally, the Model 1084A/B/C series clocks also have an option
plate that may be replaced by any one of several auxiliary boards.
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