Paradise P300 specifications P1440 in V.35 Mode, Local Loop Remote Loop, 141 140, RS232

P1440 IN V.35 MODE

The P1440 is the standard interface supplied with the P300 Series Modem. If V.35 is selected under Change, Terr-Intfc, Electrical then the following interface description applies.

Min	Signal Description	V.35
Req		Name
DATA CIRCUIT TOWARDS MODEM (TX)

Circuit	25 pin		37 pin		Electrical	Old Style
Number	A	B	A	B	Levels	Winchester

	Clock In	SCTE
U	Data In	SD
	Sig’ Valid In	RTS
	Sig Accpt’d Out	CTS
	Int’ Tx Clock Out	SCT
DATA CIRCUIT FROM MODEM (RX)
	Clock Out	SCR
	Data Out	RD
	Sig’ Valid Out	RLSD
COMMON LINES
	Signal Ground	SG
U	Shield/Protective ground	FG
	Device (DTE) Ready In	DTR
	Device (DCE) Ready Out	DSR
	Local Loop In	LL
	Remote Loop In	RL

113

103

105

106

114

115

104

109

102

101

108

107

141

140

24 11

214

4

5

15	12
17	9

316

8

7

1

20

6

18

21

17 35

422

7

9

523

826

624

13

19, 20, 21

1

12

11

10

14

V.35

V.35

RS232

RS232

V.35

V.35

V.35

RS232

Ground

Screen

RS232

RS232

RS232

RS232

U & W

P & S

C

D

Y & aa

V & X

R & T

F

B

A

H

E

-

-

The maximum data rate is 10Mbps (over good quality twisted pair screened cable), but this rate is reduced as the connecting cables extend beyond 10m. As an estimate, assume the maximum rate halves as the distance doubles (ie 5Mbps to 20m, 2.5Mbps to 40m etc).

The input clock/data phase is selected automatically, reporting a `Data Marginal` warning whenever it has to switch phase. If the modem reports Data Marginal frequently then this is not a modem fault but an indication that you have a clocking problem external to the modem (ie changing clock/data phase, a problem which would otherwise have caused untraceable data errors). With the Tx Clocking Set to Tx Clock In the `Data In` signal is checked against the `Clock In` signal. With the Tx Clocking Set to Internal or Rx the `Data In` signal is checked against the `Int’ Tx Clk Out` signal.

Note that although there are both 25 pin EIA530 pinout and 37 pin RS449 pinout connectors on the rear panel, these are simply connected in parallel. Do not use both connectors at the same time. If you require the older 34 pin `Winchester` connector then an adaptor lead is required, please contact the factory for details.

By selecting Change, Terr-Intfc, Control Lines it is possible to configure the modem to raise an alarm if either the `Sig’ Valid In` line (RTS) or `Device (DTE) Ready In` line (DTR) switch to the inactive state. It is also possible to configure the Tx carrier to be switched on and off by the `Sig’ Valid In` line (RTS) by selecting Change, Tx, Modulator, Carrier, RTS-Controlled.

P300H P300 Series Modem Installation and Operating Handbook Page 169