Ibm VERSION 5 SY44-5902-05 Instrukcja Użytkownika Pobierz pdf (Strona 281)

100

101

Communications signal voltage levels

Table 88. Communications signal voltage levels

Interface type OFF voltage level ON voltage level

V. 2 4

EIA-232

X.21bis

Less than -3 volts More than +3 volts

V.35 When terminated by a 100-ohm resistive

load, the differential voltage (A-B) is 0.55

volts +/- 20%.

When terminated by a 100-ohm resistive

load, the differential voltage (B-A) is 0.55

volts +/- 20%.

Note: See the V.35 cable to find out which pin numbers are A and B.

X.21 The differential voltage (A-B) is less than

-0.3 volts.

When terminated by a 100 ohm resistive

load, the differential voltage (B-A) is the

larger of 2.0 volts or 50% of the open

circuit voltage. The open circuit voltage is

between 2.0 and 6.0 volts.

The differential voltage (A-B) is more than

+ 0.3 volts.

When terminated by a 100 ohm resistive

load, the differential voltage (A-B) is the

larger of 2.0 volts or 50% of the open

circuit voltage. The open circuit voltage is

between 2.0 and 6.0 volts.

Note: See X.21 cable diagram to find out which pin numbers are A and B.

ISDN Logic 0

The differential voltage (A-B) is less than

+.75 volts and more than -.75 volts

(nominal).

Logic 1

The differential voltage (A-B) is 0.0 volts

(nominal).

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