Nortel Networks M3110 User Manual
Page 387
Appendix C: Meridian Modular Telephones add-on modules installation
Page 387 of 504
Telephones and Consoles
Description, Installation, and Operation
See Table 67 for a listing of the V.35 CCITT signals supported by the MCA.
Table 67
V.35 CCITT signals supported by the MCA (Part 1 of 2)
V.35
CCITT
MCA
DB-25
pin no.
Abbr.
Adaptor cable
Signal
Source
Description
DB-25
Pin No.
V.35
Pin No.
DTE
MCA
101
1
DG
1
A
Protective ground*
103A
2
SDA
2
P
X
Transmit data A
104A
3
RDA
3
R
X
Receive data A
105
4
RTS
4
C
X
Request to send
106
5
CTS
5
D
X
Clear to send
107
6
DSR
6
E
X
Data set ready
102
7
S
7
B
Signal ground
109
8
CD
8
F
X
Carrier detect
—
9/10
—
9/10
CC/L
No connection
—
11
—
11
K
X
**
115B
12
SCRB
12
X
X
Serial clock receive B
103B
13
SDB
13
S
X
Transmit data B
114B
14
SCTB
14
AA
X
Serial clock transmit B
114A
15
SCTA
15
Y
X
Serial clock transmit A
104B
16
RDB
16
T
X
Receive data B
115A
17
SCRA
17
V
X
Serial clock receive A
—
18/19
—
18/19
M/HH
No connection
Note:
* Pin 1 is connected to the MCDS shelf frame.
** These leads are ignored by the MCA controller.