Paradise P300 Services, Overhead Pinout details are provided in Appendix B, Standby LED

of the most popular modes of the P1348/P1448 voice/data mux card used often in SNG applications.

An RS232/RS422/RS485 Port for sync/async ESC traffic, this port replaces the shared ESC/Aux access via the Async ESC connector on the main unit. Used to provide access to the 8kbps synchronous IDR ESC channel. If the Async ESC feature is available (standard on P300-IBS and above) then Async access to the 8kbps channel is also available. Again if the Async ESC feature is available this port also provides the high rate Async ESC on IBS/SMS or Closed Net Plus ESC

'services

An RS232/RS422 port for sync/async Aux traffic, this port replaces the shared ESC/Aux access via the Async ESC connector on the main unit.. The Aux port provides 32 or 64kbps access to the IDR overhead in place of one or both of the IDR 32kbps ADPCM Audio ESC channels. If the IBS/SMS feature is available then this port may be configured to provide either the IBS `low rate INTELSAT oversampled ESC facility`, or a higher rate synchronous channel within the IBS/SMS

overhead.

Pinout details are provided in Appendix B.

Terrestrial Interface Connectors

The P300 provides as standard both 25 pin EIA530 and 37 pin RS449 female DCE connectors. NOTE that these are simply wired in parallel and you should not connect both simultaneously. The electrical interface is front panel selectable to be RS422, V.35, and RS232. Normally for RS232 operation the EIA530 connector would be used (which is standard 25 pin RS232 compatible) and for RS422 the 37 pin RS449 connector. The old style 34 pin `Winchester` connector favoured for V.35 interfaces has poor EMC performance and so could not be incorporated whilst maintaining CE compliance. If this style of connector is required then an external adaptor cable must be used.

If the G.703 option is fitted, then in addition to RS422/V.35/RS232, G.703 is also available as a software selectable interface standard. T1 (1544kbps) G.703 is a balanced 100 signal, and is provided on both `D` type connectors when G.703 is selected from the front panel. When the E1 (2048kbps) G.703 option is

software. As with the 25/37 pinSconnectors,Sdo not connect signals toSbothSthe BNCSand `D` type connectors simultaneously.

fitted then in addition to providing support for the balanced 120 signal on both `D` type connectors an

additional pair of BNC connectors are provided to accept the unbalanced 75 interface standard. THE

SELECTION BETWEEN 75 and 120 IS MADE BY A SWITCH ON THE E1 G.703 OPTION not by

In addition a switch on both the T1 and E1 G.703 options controls what happens to the G.703 port when power is removed. Either the G.703 ports can be set to go high impedance (used in 1:1 redundancy operation) or it can be configured to loop the G.703 input back to the output (typically used when Drop/Insert is in operation and the same PCM bearer is cascaded through several modems). Again (as it affects what happens when power is removed) this is SET BY A SWITCH ON THE CARD not by software.

Finally, for special customer requirements it is possible to fit a different interfaces to this port. Note that UNLIKE PREVIOUS PRODUCTS the interface does NOT simply unplug. Instead it is constructed as part of the main modem, and requires `snapping off` and a connector to be soldered in place before a replacement card can be fitted.

Standby LED

This LED mirrors the front panel standby LED, so that from the rear of the equipment the operator can tell if the carrier is off, or more importantly which unit of a 1:1 pair is the offline unit.

P300H P300 Series Modem Installation and Operating Handbook Page 20