G.703 NTU W/V35
11
3.5.15 C
ONNECTING
TO
A
“DTE”
DEVICE
The serial port on the MT331A/C (V.35 version) is hard-wired as a DCE. There-
fore these modules “want” to plug into a DTE such as a terminal, PC or host.
When making the connection 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 interface cable, please refer to the pin diagrams in
Appendix B. on page 15 as a guide.
3.5.16 C
ONNECTING
TO
A
“DCE”
DEVICE
If the MT331A 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.
This cable should be of the shortest possible length—we recommend 6 feet
or less.
3.6 Power connection
3.6.17 U
NIVERSAL
AC
POWER
(100–240VAC)
The MT331A uses a 5VDC, 2A universal input 100–240VAC, power supply
(center pin is +5V). The universal input power supply has a male IEC-320 power
entry connector. This power supply connects to the MT331A by means of a barrel
jack on the rear panel. Many international power cords are available for the uni-
versal power supply.
The MT331A powers up as soon as it is plugged into an AC outlet—there is no
power switch.
WARNING
There are no user-serviceable parts in the
power supply section of the MT331A.
Contact Black Box technical support at
+1 (724) 746-5500 for more information.
Summary of Contents for G.703 NTU w/V35
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