AT&T DEFINITY 2500 series Network Manual page 294

E-2
LEAD DEFINITIONS
_ ___________________________________________________________________________________________________________________________
_ ___________________________________________________________________________________________________________________________
_ ___________________________________________________________________________________________________________________________
PIN
NO. INTERCHANGE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Table E-1. EIA RS-232C (V.28) LEADS/DEFINITIONS
EIA CCITT
EQUIVALENT
CIRCUIT CIRCUIT
AA 101
BA 103
BB 104
CA 105
CB 106
CC 107
AB 102
CF 109
— —
— —
SA —
SCF 122
SCB 121
SBA 118
DB 114
SBB 119
DD 115
— —
CN
SCA 120
CD 108/2
CG 110
RL 140
CH 111
CE 125
CI 112
CU
DA 113
— —
CM
TM
LEAD DESCRIPTION
(FUNCTION)
Protective Ground
Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground/Common Ground
Received Line Signal Detected
Reserved for Testing,
(+P) Transmit Current Loop Data
Reserved for Testing
Supervisory Transmitted Data,
(–P) Transmit Current Loop Data
Secondary Received Line Signal
Detect—(Speed Mode Indication)
Secondary Clear to Send
Secondary Transmitted Data
Transmit Signal Element Timing
Secondary Received Data
Received Signal Element Timing
Normally Unassigned
Make Busy/Local Loopback
+ Receive Current Loop Data
Secondary Request to Send
Data Terminal Ready
Signal Quality Detector
Remote Loopback
Data Signal Rate Selector
Ring Indicator
Data Signal Rate Selector
Speed Select on Originate
Transmitter Signal Element Timing
Normally Unassigned
Make Busy/Local Loopback
Test Mode
– Receive Current Loop Return