G.703/G.704 NTU W/V35
15
3.4.28 C
ONNECTING
THE
T
WISTED
P
AIR
(120
OHM
)
TO
THE
G.703 N
ETWORK
Figure 4.
G.703/G.704 170 ohm Connection.
3.5 Connecting the Serial Port
The MT335A supports V.35 serial port connections, this section describes how to
connect the serial ports to your terminal equipment.
3.5.29 C
ONNECTING
TO
A
“DTE” D
EVICE
The serial port on the MT335A is hard-wired as a DCE. Therefore these modules
“want” to plug into a DTE such as a terminal, PC or host. When making the con-
nection to your DTE device, use a straight through cable of the shortest possible
length—we recommend 6 feet or less. When purchasing or constructing an inter-
face cable, please refer to the pin diagrams in Appendix D as a guide.
3.5.30 C
ONNECTING
TO
A
“DCE” D
EVICE
If the MT335A serial interface is hard-wired as a DCE, you must use a null
modem cable when connecting to a modem, multiplexer or other DCE device.
RJ-45 Cable (8-Wire)
G.703/G.704
NETWORK SIGNAL
SIGNAL
PIN#
RX+
1-----------------------TX+
RX-
2-----------------------TX-
TX+
5-----------------------RX+
TX-
4-----------------------RX
Shield
3-----------------------Shield
Shield
6-----------------------Shield
(No Connection) 8
(No Connection) 7
(No Connection) 6
(TX+) 5
(TX-) 4
(No Connection) 3
(RX-) 2
(RX+) 1
8
7
6
5
4
3
2
1
MT335A
