23
MODULAR FIBER CAMPUS DRIVER, MFCD PLUS
X.21 Interface Pin Description (DB15 Female Connector)
Pin #
Signal
1
Frame Ground
2
T (Transmit Data-A)
3
C (Control-A)
4
R (Receive Data-A)
5
I (Indication-A)
6
S (Signal Element Timing-A)
7
BT (Byte Timing-A)
8
SGND (Signal Ground)
9
T/ (Transmit Data-B)
10
C/ (Control-B)
11
R/ (Receive Data-B)
12
I/ (Indication-B)
13
S/ (Signal Element Timing-B)
14
BT/ (Byte Timing-B)