Eicon Networks ISDN NT1 Spezifikationen PDF herunterladen (Seite 26)

26 The X.21 Interface

The X.21 Interface

A pin-out diagram for the X.21

interface is shown in Figure 16.

The signal definitions and names

are listed in Table 9.

Figure 16. X.21 Interface

PGND

1

T(A)

C(A)

R(A)

I(A)

S(A)

B(A)

SGND

T(B)

C(B)

R(B)

I(B)

S(B)

B(B)

PGND

15

8

9

Table 9. X.21 Interface Signals

Pin # Signal Name Direction CCITT #

1/15 PGND Protective Ground Common 101

2 T(A) Transmit Data (+) Output 103A

3 C(A) Control Signal (+) Output 105A

4 R(A) Receive Data (+) Input 104A

5 I(A) Indication (+) Input 109A

6 S(A) Signal Element Timing (+) Input 115A

7 B(A) Byte Timing (+) Input 114A

8 SGND Signal Ground Common 102

9 T(B) Transmit Data (-) Output 103B

10 C(B) Control Signal (-) Output 105B

11 R(B) Receive Data (-) Input 104B

12 I(B) Indication (-) Input 109B

13 S(B) Signal Element Timing (-) Input 115B

14 B(B) Byte Timing (-) Input 114B

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 39 40

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