Paradise P300 specifications Rear Panel Description, Rating

Station Clock

3.5REAR PANEL DESCRIPTION

At the rear of unit are all of the connectors necessary for the user to interface the Modem to the outside world; IF input and output to frequency conversion equipment, terrestrial data connection, station clock, alarms & AGC output, remote M&C, AC power and so on.

100-240Vac	PARADISE DATACOM					ESC, AUX &			MULTI STANDARD INTERFACE
0.3-0.1A	S/N	1097				BACKWARD
50/60Hz				1998		ALARMS
			1 FOR 1		ALARMS & AGC
								E1
								75R
	STATION CLOCK		REMOTE M&C	Rx IF	ASYNC ESC	Tx IF	IN	OUT	P1440A

P300 Modem rear panel view (IDR & G.703 options fitted)

From left to right, the rear panel connectors are:

IEC mains power connector/voltage selector/fuse

The Modem is designed to operate from a mains AC supply of 100-240V (-15% + 10%, ie 85V to 264V at the connector). The IEC connector incorporates two fuses, independently fusing both live and neutral lines. Access to the fuses are provided by a slide out tray. Both fuses are standard 20 mm type, rated 2A, of the slow-blow (time delay) type. ALWAYS REPLACE THE FUSE WITH ONE OF THE SAME TYPE AND

RATING.

Chassis ground stud

This is an M4 stud for connecting a safety earth conductor directly to the chassis of the unit.

Fan

The fan may be selected to be temperature controlled or permanently active (ie the fact that it is not running does not indicate it has failed). Use the test menu to display the internal unit temperature if in doubt, the fan comes on at 26 C and off at 24 C.

This connector isEa 75 BNC femaleEwhich accepts a 1-10MHz signal, either a square wave of >1V p/p (eg a G.703 para 10 `synchronisingSclock`) or a sinusoid at a power level of 0dBm or greater. An alternative Station Clock signal at RS422 interface levels can be applied to the Async ESC connector. Either signal can be used by the modem as a reference for the receive output clock (the Station Clock does not have to be the same rate as the data as an internal PLL converts between rates). In addition if the Rx Clocking is set to use the “Station Clock” and the Tx Clocking is set to “Rx”, then the Station Clock also sources the internally generated Tx Clock (Tx & Rx data rates are independent). Finally, if a 10MHz signal is applied, this signal may also be used in place of the internal reference for the Tx and Rx IF synthesisers.

1:1 Redundancy connector

The Modem has a built-in 1 for 1 redundancy controller which connects to the corresponding port of another Modem via this 9 pin male 'D' type connector. A complete 1:1 redundancy system requires only two modems, a 1:1 control cable (on this port), a data split (`Y`) cable, and passive splitters/combiners for the IF ports (or splitters/combiners already present in the system). Connection details are given in Appendix B, and an overview of 1 for 1 operation is provided in section 9 starting on page 163.

Remote M&C connector

This is a 9 pin female 'D' type connector whose pinout and interface levels are `SA-bus` compliant. The Modem can be set to operate with either Paradise/FDC or SA-bus protocols. The electrical interface can be selected between RS232 (for direct to PC applications) & RS485 (for multidrop applications). The Remote M&C port may be internally linked (ie no cables) to the Async ESC port for over the satellite distant end Remote M&C control. Pinout details are in Appendix B.

P300H P300 Series Modem Installation and Operating Handbook Page 18