18
SHM-768K
Table 3-1. Interface Signal List (Female Connectors) Pins and
Standard Signal Names (continued).
V.35
EIA-530
X.21
Signal
DB25
34-Pin
DB25
DB25
DB15
Description
Function
Frame Standalone
Standalone
Frame
Standalone
Pin Circuit
Pin Circuit
Pin Circuit/
(Function)
Clear to
5
D CTS 106
5 CB(A)
A positive level
Send
13 CB(B)
from the SHM
without delay,
after receipt of
Request to
Send, and when
the SHM is
ready to
transmit.
Data Set
6
E DSR 107
6 CC(A)
A positive level
Ready
22 CC(B)
from the SHM
when the power
is on, and the
SHM (a) is not
in the DIGITAL
LOOP mode, or
(b) has not
received a
REMOTE
LOOPBACK
signal from the
remote unit.
Data
20
H DTR 108
20 CD(A)
Not used.
Terminal
23 CD(B)
Ready
Carrier
8
F DCD 109
8 CF(A)
8
5 I(A)
A positive level
Detect
10 CF(B)
10
12 I(B)
from the SHM,
(Indication)
except when a
loss of the
received carrier
signal is
detected, or
when Data Set
Ready is
negative.
