AT&T DEFINITY 2500 series Network Manual page 296

E-4
LEAD DEFINITIONS
_ ___________________________________________________________________________________________________________________________
_ ___________________________________________________________________________________________________________________________
_ ___________________________________________________________________________________________________________________________
PIN
NO. INTERCHANGE CIRCUIT
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
26
27
28
29
30
31
32
33
34
35
36
37
Note: Denotes category II or balanced circuits. All MPDM interchange circuits are implemented with RS-
423 line drivers.
Table E-3. EIA RS-449 (V.24) LEADS/DEFINITIONS
EIA
—
SI
— Unassigned
SD(A) Send Data
ST(A) Send Timing
RD(A) Receive Data
RS(A) Request to Send
RI(A) Receive Timing
CS(A) Clear to Send
LL Local Loopback
DM(A) Data Mode
TR(A) Terminal Ready
RR(A) Receiver Ready
RL Remote Loopback
IC Incoming Call
SR
TT(A) Terminal Timing
TM Test Mode
SG
RC Receive Common
— Unassigned
SD(B) (Note) Send Data
ST(B) (Note) Send Timing
RD(B) (Note) Receive Data
RS(B) (Note) Request to Send
RT(B) (Note) Receive Timing
CS(B) (Note) Clear to Send
— Unassigned
DM(B) (Note) Data Mode
TR(B) (Note) Terminal Ready
RR(B) (Note) Receiver Ready
— Unassigned
SQ
— Unassigned
TT(B) (Note) Terminal Timing
SB
SC Send Common
LEAD DESCRIPTION
(FUNCTION)
Shield
Signal Rate Indicator
Signaling Rate Selector
Signal Ground
Dummy Generator ON
Dummy Generator OFF
MPDM (Note)
INPUT/OUTPUT
—
I
—
I
O
O
I
O
O
I
O
I
O
I
O
I
I
O
X
O
—
I
O
O
I
O
O
—
O
I
O
—
O
—
I
O
I