3
T
R
O
U
B
L
E
S
H
O
O
T
I
N
G
Troubleshooting Guide 3-1
M
odem Health 3-1
Modem - DTE Connection 3-2
Modem - Telephone Line Connection 3-3
Connection Problems in Answering a Call 3-3
Connection Problems When Originating a Call 3-4
On-line Operation 3-6
Private-line Operation 3-6
Dial Backup Operation 3-6
A
M
O
D
E
M
S
P
E
C
I
F
I
C
A
T
I
O
N
A
N
D
I
N
T
E
R
F
A
C
E
P
I
N
A
S
S
I
G
N
M
E
N
T
S
Transmitter / Receiver Specifications A-1
Autodial - Autoanswer A-2
Physical Description A-3
Approvals Information A-4
General Approvals Requirements A-4
Interference and Safety Requirements A-5
PBX and PABX Application A-6
Ringer Equivalence A-7
DTE Port Pin Assignments A-8
X.21/V.11 A-8
V.24/V.28 A-9
V.35/V.36 A-10
P
STN Port Cable Pin Assignments A-11
P
rivate Line Port Cable Pin Assignments A-12
