X4000
User’s Guide
395
Features of Basic Unit
13
DB-15 Plug for X.21
A DB-15 plug to ISO 4903 is normally used for an X.21 interface:
Figure 13-4:
DB-15 plug (DTE)
The DB-15 plug (DTE) and socket (DCE) have the following pin assignment:
Table 13-4:
Pin assignment of DB-15 plug for X.21 (ISO 4903)
Variable Connector=DTE
Signal direction
Pin no.
Variable Connector=DCE
ITU-T
Signal
Signal
ITU-T
101
PG
––– 1 –––
PG
101
102
SG
––– 8 –––
SG
102
103
T+
9 ––––>
R+
104
103
T-
2 ––––>
R-
104
104
R+
<–––––11
T+
103
104
R-
<––––– 4
T-
103
105
C+
10 ––––>
I+
106
105
C-
3 ––––>
I-
106
106
I+
<–––– 12
C+
105
106
I-
<––––– 5
C-
105
115
S+
<–––– 13
S+
114
115
S-
<––––– 6
S-
114
.....
1
8
.....
9
15
Summary of Contents for X4000
Page 4: ...4 X4000 User s Guide...
Page 6: ...6 X4000 User s Guide Table of Contents...
Page 14: ...14 X4000 User s Guide Table of Contents...
Page 30: ...30 X4000 User s Guide Welcome 1...
Page 34: ...34 X4000 User s Guide General Safety Precautions 2...
Page 68: ...68 X4000 User s Guide Hardware Description and Installation 3...
Page 92: ...92 X4000 User s Guide Configuration Requirements 4...
Page 118: ...118 X4000 User s Guide Fast Configuration with the Configuration Wizard Basic Unit 6...
Page 362: ...362 X4000 User s Guide Configuration of Security Functions and Firewall 10...
Page 374: ...374 X4000 User s Guide Configuration Management 11...
Page 386: ...386 X4000 User s Guide Troubleshooting 12...
Page 433: ...X4000 User s Guide 433 15...
Page 449: ...X4000 User s Guide 449 15...
Page 468: ...468 X4000 User s Guide General Safety Precautions in 15 Different Languages 15...
Page 496: ...496 X4000 User s Guide Index...
Page 498: ...498 X4000 User s Guide Document 71000L Version1 3...