MDS MDS 9710 Series Specifikace stáhnout pdf (Strana 21)

MDS 05-3305A01, Rev. D MDS 4710/9710 I/O Guide 13

3.1 LED Indicators

Table 7 describes the function of each status LED.

3.2 RSSI Measurement

As an alternative to using an HHT, the radio’s received signal strength

(RSSI) can be read with a DC voltmeter connected to Pin 21 of the

DATA

INTERFACE connector. Figure 7 shows the relationship between

received signal level and the DC voltage on Pin 21 of the

DATA INTER-

FACE connector. (Note: Readings are not accurate for incoming signal

strengths above –50 dBm.)

Invisible place holder

Figure 7. RSSI vs. Vdc (Typical)

PWR DCD TXD RXD

Table 7. LED Status Indicators

LED Name Description

PWR • Continuous—Power is applied to the radio, no problems detected.

• Rapid flash (five times-per-second)—Fault indication.

• Flashing once every 5 seconds—Radio is in Sleep mode.

DCD • Flashing—Indicates the radio is receiving intermittent data frames.

• Continuous—Radio is receiving a data signal from a continuously

keyed radio.

TXD An EIA-232 mark signal is being received at the DATA INTERFACE

connector.

RXD An EIA-232 mark signal is being sent out from the DATA INTERFACE

connector.

2.5

3.5

–110

–90

–70

–50

+ DC VOLTS (PIN 21)

SIGNAL LEVEL (dBm)

4.5

5.0

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 57 58

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MDS MDS 9710 Series Specifikace Strana 21