18
MICRONTU G.703 CARD (120 OR 75 OHM)
4.3.1 T
WISTED
-P
AIR
(120-O
HM
) C
ONNECTION
(MT245A)
The 120-ohm version of the MicroNTU G.703 Card is equipped with a single
RJ-45 jack for connection to a 120-ohm twisted-pair G.703 network interface.
The pinout of this jack is as follows:
RJ-45 Pins
Signal
1 and 2
Receive pair (from network)
3
Shield reference point
4 and 5
Transmit pair (to network)
6
Shield reference point
7
Not used
8
Not used
4.3.2 D
UAL
C
OAX
BNC (75-O
HM
) C
ONNECTION
(MT246A)
The 75-ohm version of the MicroNTU G.703 Card is equipped with dual
female BNCs (TX and RX) for connection to a 75-ohm dual coax G.703
network interface. The outer conductor of the coax cables is isolated from
system earth ground.
4.4 Connection to the Terminal Device
The MicroNTU G.703 Card is wired as a DCE, and—when configured
properly—supports communication with a variety of terminal (DTE) devices.
4.4.1 EIA-530 (RS-422) T
ERMINAL
C
ONNECTION
(MT245A)
The 120-ohm rear card for the MicroNTU G.703 Card is equipped with a
female DB25 connector. This connector is wired according to the EIA-530
standard (see the wiring diagram in the
Appendix
). To connect to an RS-530
terminal (DTE), use a standard DB25 cable.
NOTE
The 120-ohm rear card must be set for non-synchronized clocking (see
Section 3.2.1) in order to support the EIA-530 interface.
