APP APP-601, Руководство по эксплуатации, Страница: 54 / 146

Hardware 4-17

Microcontroller With Ethernet Media Access Controller 10/100

2MB Serial Flash Memory IC

IRIG Isolation IC & Isolation Transformer

IRIG-B Demodulating Circuit

BNC Connectors for IRIG-B Input, 1PPS Output & 1PPS Input

RJ45 Connector (Ethernet Connection)

Mini Din Connector (Used by the factory for initial IP address and board setup)

Jumper Settings

JP1 – Jumper On =Normal Operating State
Jumper Off =Factory Debug Position

JP2 – Jumper Pins 1 to 2 =Modulated IRIG-B Input
Jumper Pins 2 to 3 =Un-Modulated IRIG-B Input

JP3 – Jumper Pins 1 to 2 = External 1PPS
Jumper Pins 2 to 3 = Internal 1PPS
Note: Internal 1PPS indicates that an IRIG-B signal has been connected to the DSP circuit board
(the 1PPS signal is part of the IRIG-B signal).
External 1PPS indicates the DSP circuit board is receiving a 1PPS signal from another
DSP circuit board or possibly from a clock 1PPS output.

J1 is used to connect an emulator. Under normal operating conditions. J1 must have four
jumpers in the following positions:
5 to 6
7 to 8
9 to 10
11 to 12

J2 is used by the factory to download a program to the microprocessor/Ethernet IC. During
normal operation J2 has no jumpers.

If the 1PPS signal is daisy chained from chassis to chassis via the input and output BNCs the
latency is 100ns per jump. Latency can be nearly eliminated by using a BNC “T” connector
and paralleling the 1PPS signal from input to input.
Pin layout 13 11 9 7 5 3 1
14 12 10 8 6 4 2