
Eicon Connections for Linux User’s Guide
page 59
Null-Modem Cables
This section contains information, including pin-out diagrams, on various Dialogic null-modem
cables, .
All current null-modem cables for Eiconcards are shown in the table below. These cables may
be ordered from your Dialogic distributor.
Note: Not all cables are symmetrical: both ends of a cable are not necessarily identical.
These null-modem cables can be used to perform the following functions:
• The V.24 Null-Modem Cable connects an Eiconcard to another Eiconcard, using an V.24
interface.
• The V.24/V.35 HSI/HSI Null-Modem Cable connects an Eiconcard HSI to another Eiconcard
HSI, using a V.24 or V.35 interface.
• The X.21 HSI Null-Modem Cable connects an Eiconcard HSI to another Eiconcard HSI, using
an X.21 interface. When using this cable to connect two Eiconcards, be sure to set both
ends to NRZI encoding, Internal Clocking, and the line speed to 19.2 kbps or less.
• The HSI Null-Modem Conversion Cable connects an Eiconcard HSI to a HSI Modem Cable
connector.
Cable Name Part Number
V.24 Null-Modem Cable 300-022
V.24/V.35 HSI/HSI Null-Modem
Cable
300-031
X.21 HSI Null-Modem Cable 300-032
HSI Null-Modem Conversion Cable 300-033
DB-26 Male
DB-15 Male
X.21 HSI Modem Cable
1
8
6
13
4
11
12
5
7
14
2
9
10
3
15
NC
300-025
1
7
9
10
11
12
13
16
14
23
19
26
20
24
PGND
SGND
S(A)
S(B)
R(A)
R(B)
I(B)
I(A)
B(A)
B(B)
T(A)
T(B)
C(B)
C(A)
300-026
V.24 HSI Modem Cable
DB-26 Male DB-25 Male
1
2
3
4
5
6
7
8
15
17
18
20
21
22
24
25
1
2
3
4
5
6
7
8
15
17
18
20
21
22
24
25
PGND
TxD
RxD
RTS
CTS
DSR
SGND
DCD
TxCLK
RxCLK
TEST
DTR
RLB
RI
CLK
TI
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