User Manual

DXU Distribution Switch Unit
Table 4 G.703 Interface Pins
Pin Function
1 Data up, hot wire, 75 W (not used for T1)
2 Data up, shield, 75 W (not used for T1)
3 Ground
4 Data down, shield, 75 W (not used for T1)
5 Data down, hot wire, 75 W (not used for T1)
6 Data up, twisted pair 100/120 W
7 Data up
, twisted pair 100/120 W
8 Data down, twisted pair, 100/120 W
9 Data down, twisted pair, 100/120 W
Pin 2 and Pin 6 are connected and both may be used to connect shield from
data up-coax. Pin 4 and Pin 9 are used for data down-coax.
OMT RS 232
The OMT RS 232 port is used for communication with the OMT. The OMT
is connected to the DXU with a 9-pin female D-sub. The OMT connection is
galvanically separated. All signals use RS 232 levels. For information about the
OMT pins and their functions, see the table below.
Table 5 OMT Pins
Pin Function
1 DCD, looped from DTR (Pin 4)
2 RxD, data out of DXU
3 TxD, data into DXU 4
4 DTR, looped to DCD (pin 1) and DSR (pin 6)
5 Signa
l ground
6 DSR, looped from DTR (pin 4)
7 RTS, looped from CTS (pin 8)
8 CTS, looped from RTS (pin 7)
9 RI not connected
Note: The connector is configured as a DCE, and thus should be connected
to an IBM PC style DTE (such as a computer) with a straight cable.
9 (12)
EN/LZT 720 0243 Uen R1A