Black Box MT240A-R2, MT245A, MT246A, MT241A Specifications
1
Support EIA-530
(V.36/RS-422), X.21,
or V.35 terminal
interfaces.
Sync network data
rates up to 2.048 Mbps.
Make dual coax
BNC (75-ohm) and
twisted-pair (120-ohm)
network connections.
MicroRACK Card
versions and X.21-only
model also available.
Standalone models
feature rate adaptation
for 256 kbps, 512 kbps,
and 1.024 Mbps.
Internal, external, and
receive loopback
clocking.
Easy to configure with
DIP switches and
jumpers.
T
hese Micro NTUs give you
everything you need to make
G.703 connections. Depending
on the model you order, you can
easily connect bridges or routers
with RS-530, X.21, or V.35
interfaces to G.703 networks.
Best of all, the device’s
versatility in data rates and
interfaces makes it ideal for
a variety of LAN and WAN
environments. Use it three ways:
• Use the Micro NTU as a
modem. As a modem, it
sends unstructured,
synchronous 2.048-Mbps
data from a G.703/E1 network
to a router, bridge, or mux.
• Use the Micro NTU as an
interface converter. In this
application, it accepts either
75-ohm (dual coax) or
120-ohm (twisted-pair)
G.703/E1 signals and
converts them so your
RS-530, X.21, or V.35
equipment can understand
them. Dual coax and modular
interfaces are located on the
NTU’s rear panel. All
interfaces are switchselectable and use an HD26
connector.
A G.703 modem, interface converter,
and rate adapter in one compact device.
Key Features
MICRO NTUS
• Use the Micro NTU as a rate
adapter. In this application
you can use the Micro NTU
to connect a device with a
lower bandwidth (256 kbps,
512 kbps, or 1.024 Mbps ) to
a 2.048-Mbps G.703/E1 link.
The Micro NTU operates
from internal, external, or network
(received loop) clock sources.
In addition, the device includes
loopback diagnostics and five
front-panel LEDs for easy
monitoring.
To configure the Micro NTU,
just set the externally accessible
DIP switches and internal
jumpers. These switches and
jumpers enable you to set
clocking, data rate, and test
options.
Choose from standalone
or card versions. Because the
standalone model features both
75- and 120-ohm connections,
no special adapters are needed.
The card version features
all the benefits of the standalone
unit—without the multiplexor or
V.35 capabilities— and has a midplane architecture for full hot
swappability. It’s available in two
versions: 75-ohm dual coax and
120-ohm twisted pair. The 75ohm model includes dual BNC
connectors and a DB15 connector
for X.21 terminal connections.
The 120-ohm model includes
a modular jack and a DB25
connector for RS-530 (V.36/
RS-422) terminal connections.
For a diagram of just one
application for the Micro NTU,
see page 2. However, a more
typical application than that is to
use the Micro NTU to connect a
bridge or router— without a native
G.703 interface—to a 2.048-Mbps
G.703 network. Used this way, the
bridge or router may have an
RS-530 (V.36/RS-422), V.35, or X.21
interface, and the G.703 network
may be coax or twisted pair.
The Micro NTU can be
deployed overseas as well. It’s
CE approved, it can be used in
most European countries, and
the standalone AC models come
with switch-selectable 115-/
230-VAC power supplies.
Black Box Corporation • 1000 Park Drive • Lawrence, PA 15055-1018 • Tech Support: 724-746-5500 • www.blackbox.com • e-mail: info@blackbox.com
© 2005. All rights reserved.
Black Box Corporation.
5/31/2005 #15970
2
Clocking: Internal, external, network
(receive loop)
Network Rate: 2.048 Mbps
Receiver Sensitivity: -10 dB
(0 dB = 2.4V)
Speed: Network: 2.048 Mbps;
Terminal: 256 kbps, 512 kbps,
1.024 Mbps, 2.048 Mbps
Diagnostics: Loopback test
Terminal Interface:
MT240A-R2: EIA RS-530 (RS-422),
X.21, V.35 on HD26 F using
cables (EHN092);
MT241A: X.21 on DB15 F;
MT245A: RS-530 on DB25 F;
MT246A: X.21 on DB15 F
Network Interface: G.703
Network Connectors: MT240A-R2,
MT241A: (2) BNC F (75-ohm) and
(1) modular RJ-45 (120-ohm);
MT245A: (1) modular RJ-45
(120-ohm);
MT246A: (2) BNC F (75-ohm)
Indicators: (5) LEDs: Power,
Network, Master Clock, Loop,
Loopback
Power: MT240A-R2, MT241A:
230 VAC/50 Hz or 115 VAC/
60 Hz, switch-selectable;
MT245A–MT246A: From the
MicroRACK chassis
Temperature Tolerance: Operating:
MT240A-R2, MT245A–MT246A:
32 to 140°F (0 to 60°C);
MT241A: 32 to 122°F (0 to 50°C)
Humidity Tolerance: MT240A-R2,
MT245A–MT246A: 5 to 95%,
noncondensing;
MT241A: 9 to 95%,
noncondensing
Size: MT240A-R2, MT241A:
7.3"H x 6.6"W x 1.6"D (18.5 x
16.8 x 4.1 cm);
MT245A–MT246A: 3.1"H x
0.95"W x 4.4"D (7.9 x 2.4 x
11.2 cm)
Weight: Standalone models:
2 lb. (0.9 kg)
Specifications
Ordering Information
ITEM CODE
Micro NTU G.703
Standalone, AC.................................................MT240A-R2
Card
(Fits the MicroRACK. For product details, request Product Data
Sheet 12915.)
120-Ohm................................................................MT245A
75-Ohm..................................................................MT246A
Micro NTU G.703↔X.21............................................MT241A
Y
ou will need the appropriate cable and an adapter…
Adapter Cable
HD26 Male to DB25 Male..............................EHN092-530
HD26 Male to M/34 Male..............................EHN092-V35
HD26 Male to DB15 Male .........................EHN092-X21M
G.703 75–120 Adapter........................................MT1242A-M
Use the Micro NTU G.703 standalone model to split off a
smaller piece of bandwidth for LAN communications.
LAN
PCs
Bridge/Router
Micro NTUs
(MT240A-R2)
Bridge/Router
LAN
PCs
E1
2.048 Mbps
X.21
X.21
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