Paradise P300 specifications Operation, Fault Philosophy, Electrical Description

3 DESCRIPTION

3.1OPERATION

The P300 Series modem are fully software controlled and with the exception of the optional G.703 interface option there are no links or switches used to configure the unit. This enables all control and configuration to be performed either locally from the front panel, or by remote M&C. Local control is by front panel keyboard, and a large, easy to read, 80 character LCD display, with clear, intuitive menus for configuration and control. All the set-up parameters are stored in non-volatile memory which will retain data for a minimum of 3 years, with no power applied. The receive and transmit functions of the Modem are independent, so that they may be operated at a different data rates, IF frequencies, or different services if required.

Like all Paradise Datacom products, the P300 Series includes a traffic log which stores the last 1000 events, suitably time-stamped. It can automatically add several measured parameters to the log at operator set intervals, including average & worst case Eb/No, average & worst case estimated user BER, average

&worst case estimated uncorrected BER, and the buffer fill state. The logged performance monitoring allows investigation into customer reports of poor link performance, and can provide a useful correlation against weather conditions, etc.

3.2FAULT PHILOSOPHY

Faults are split into two categories:

a)UNIT FAULTS: Equipment failures (such as a synthesiser lock failure).

b)TRAFFIC FAULTS: Data path failures, (such as a lack of input clock).

A full description of every detected fault, its category (unit or traffic), and the corresponding action taken is provided in Appendix G - Fault Messages and Action Table. The response of the front panel LED indicators and external fault relays respond is described in the following sections.

3.3ELECTRICAL DESCRIPTION

The P300 modem comprises of a single main modem Printed Circuit Board (PCB) with four optional additional boards:

Optional G.703 interface (two different boards for T1 or E1 operation). Optional IDR ESC board which provides for all the IDR ESC requirements

Optional Monitor / AGC board which provides a user scalable AGC output and a constellation monitor point.

Optional Turbo FEC daughtercard

For the P310, an L-Band daughterboard is also fitted internally above the main modem board, and further three internal options are possible:

Reference oscillator options (several of varying stabilities)

An internal 100W PSU to provide a DC feed to an external BUC

'An optional FSK communications board, to enable a modem and BUC to bo operated from the modem front panel (and to provide closed loop power control to the BUC flange).

P300H P300 Series Modem Installation and Operating Handbook Page 16