Page 1
®
BLACK BOX
NETWORK SERVICES
G.703 NTU
w/10BaseT
®
MARCH 2006
MT330A
CUSTOMER
SUPPORT
INFORMATION
G.703 NTU w/10BaseT
Link
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
TMStatus10BTE1
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G.703 NTU W/10BASET
CE NOTICE
The CE symbol on your Black Box equipment indicates that it is in compliance
with the Electromagnetic Compatibility (EMC) directive and the Low Voltage
Directive (LVD) of the European Union (EU). A Certificate of Compliance is
available by contacting Technical Support.
RADIO AND TV INTERFERENCE
The Multi-Rate Ethernet Extender generates and uses radio frequency energy,
and if not installed and used properly-that is, in strict accordance with the manufacturer’s instructions-may cause interference to radio and television reception.
The Multi-Rate Ethernet Extender has been tested and found to comply with the
limits for a Class A computing device in accordance with specifications in Subpart B of Part 15 of FCC rules, which are designed to provide reasonable protection from such interference in a commercial installation. However, there is no
guarantee that interference will not occur in a particular installation. If the Ethernet Extender does cause interference to radio or television reception, which can
be determined by disconnecting the unit, the user is encouraged to try to correct
the interference by one or more of the following measures: moving the computing equipment away from the receiver, re-orienting the receiving antenna and/or
plugging the receiving equipment into a different AC outlet (such that the computing equipment and receiver are on different branches).
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G.703 NTU W/10BASET
FCC PART 68
The MT330A is not intended to be connected to the public telephone network.
Caution
TRADEMARKS USED IN THIS MANUAL
All applied-for and registered trademarks are the property of their respectiv e o wners.
NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT
Instrucciones De Seguridad
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes
de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc.
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más
allá a lo descrito en las instrucciones de operación. Todo otro servicio
deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá, alfombra
o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor , estuf as u otros aparatos (incluyendo
amplificadores) que producen calor .
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G.703 NTU W/10BASET
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo
descrito en el instructivo de operación, o como se indique en el aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean
pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo
particular atención a los contactos y receptáculos donde salen del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas
de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A. El cable de poder o el contacto ha sido dañado; u
B. Objectos han caído o líquido ha sido derramado dentro del aparato; o
C. El aparato ha sido expuesto a la lluvia; o
D. El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E. El aparato ha sido tirado o su cubierta ha sido dañada.
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G.703 NTU W/10BASET
CONTENTS
CE Notice .................................................................................................... 2
Radio and TV Interference.......................................................................... 2
FCC Part 68................................................................................................. 3
Trademarks Used In This Manual............................................................... 3
Normas Oficiales Mexicanas (NOM) Electrical Safety Statement............. 3
1. General Information ....................................................................................7
1.1 Features ...............................................................................................7
1.2 Description ......................................................................................... 7
2. PPP Operational Background...................................................................... 8
2.3 Applications........................................................................................ 8
3. Configuration............................................................................................. 10
3.4 DIP Switch Configurations............................................................... 10
3.4.1 Switch S1 settings.................................................................. 11
3.4.2 SW1-1 Line Coding: HDB3 (default).................................... 11
4. Installation................................................................................................. 13
4.5 Connecting to the G.703 Network and Ethernet LAN ..................... 13
4.5.3 Connecting Dual Coaxial Cable (75 ohm) to the
G.703 Network ...................................................................... 14
4.5.4 Connecting the Twisted Pair (120 ohm) to the
G.703 Network ...................................................................... 15
4.5.5 Connecting the 10Base-T Ethernet port to a PC (DTE) ........ 15
4.5.6 Connecting the 10Base-T Ethernet Port to a Hub ................. 16
4.5.7 Power Connection.................................................................. 16
5. Operation................................................................................................... 17
5.6 Power-up........................................................................................... 17
5.7 LED Status Monitors........................................................................ 17
5.8 Operating Line Loopback (LL) ........................................................ 19
A. G.703 Specifications ................................................................................. 20
A.1 Network Data Rate ...........................................................................20
A.2 Network Connector ..........................................................................20
A.3 Nominal Impedance ..........................................................................20
A.4 Line Coding ......................................................................................20
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G.703 NTU W/10BASET
A.5 Line Framing ....................................................................................20
A.6 Clocking ...........................................................................................20
A.7 Distance ............................................................................................20
B. Ethernet 10Base-T Specifications ............................................................. 21
B.8 DTE Interface ...................................................................................21
B.9 DTE Data Rates ................................................................................21
B.10 LAN Connection ..............................................................................21
B.11 Protocol .............................................................................................21
B.12 MAC Address Table Size .................................................................21
B.13 MAC Address Aging ........................................................................21
B.14 Frame Buffer ....................................................................................21
B.15 Frame Latency ..................................................................................21
B.16 Diagnostics .......................................................................................21
B.17 Indicators ..........................................................................................21
B.18 Configuration ....................................................................................21
B.19 Power Supply ....................................................................................22
B.20 Humidity ...........................................................................................22
B.21 Temperature ......................................................................................22
B.22 Dimensions .......................................................................................22
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G.703 NTU W/10BASET
1. General Information
Thank you for your purchase of this Black Box product. If any questions arise
during installation or use of the unit, contact Black Box Tech Support at
(724) 746-5500.
1.1 Features
•
Terminates G.703 E1 service
•
Available in low-cost standalone or rack-mountable versions
•
2.048 Mbps data rate
10Base-T Ethernet bridge
•
PPP (Point to Point Protocol, RFC 1661) with Bridge Control Protocol
•
(RFC 1638)
75-ohm dual coax and 120-ohm twisted-pair G.703 connections
•
Line loopback diagnostics
•
Internal and G.703 network timing
•
CE marked
•
•
100–240 VAC
•
Conforms to ONP requirement CTR 12 for connection to international Telecom networks
1.2 Description
The MT330A receives clear channel E1/G.703 (2.048-Mbps) data from the
telco's digital data network. The MT330A terminates the G.703 telco interface
and converts the data for transmission to a user-oriented 10Base-T (802.3) Ethernet interface.
The Ethernet (MT330A) supports an integrated 10Base-T (802.3) Ethernet port
with transparent bridging capability for IP, IPX, DECnet, NetBIOS and other
layer-3 protocols. The MT330A attaches to the LAN and intelligently bridges
data traffic to the large central site router through the telco's leased line network.
The MT330A supports PPP (RFC 1661) and BCP (RFC 1638).
The MT330A is a 10Base-T bridge that operates over G.703 lines. It uses MAC
learning and forwarding to provide seamless LAN-to-LAN connectivity. As a
result, corporate enterprises can connect their servers to a pair of NTUs and automatically forward data packets that are meant for the remote network. Local
packets are filtered and passed only to the local LAN.
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G.703 NTU W/10BASET
2. PPP Operational Background
PPP is a protocol used for multi-plexed transport over a point-to-point link. PPP
operates on all full duplex media, and is a symmetric peer-to-peer protocol,
which can be divided into the following main components:
A standard method to encapsulate datagrams over serial links
•
•
A Link Control Protocol (LCP) to establish, configure, and test the data-link
connection
A family of Network Control Protocols (NCPs) to establish and configure dif-
•
ferent network layer protocols
In order to establish communications over a point-to-point link, each end of the
PPP link must first announce its capabilities and agree on the parameters of the
link’s operation. This exchange is facilitated through LCP Configure-Request
packets.
Once the link has been established and optional facilities have been negotiated,
PPP will attempt to establish a network protocol. PPP will use Network Control
Protocol (NCP) to choose and configure one or more network layer protocols.
Once each of the network layer protocols have been configured, datagrams from
the established network layer protocol can be sent over the link. The link will
remain configured for these communications until explicit LCP or NCP packets
close the link down, or until some external event occurs.
The PPP Bridging Control Protocol (BCP), defined in RFC 1638, configures and
enables/disables the bridge protocol on both ends of the point-to-point link. BCP
uses the same packet exchange mechanism as the Link Control Protocol (LCP).
BCP is a Network Control Protocol of PPP, bridge packets may not be exchanged
until PPP has reached the network layer protocol phase.
2.3 Applications
In situations where a routed network requires connectivity to a remote Ethernet
network, the interface on a router can be configured as a PPP IP Half Bridge. The
WAN line to the remote bridge functions as a Virtual Ethernet interface, effectively extending the routers WAN port connection to the remote network. The
bridge device sends bridge packets (BPDU’s) to the router’s WAN interf ace. The
router will receive the layer three address information and will forward these
packets based on its IP address.
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MT330A
G.703 NTU W/10BASET
MT331A
A
S
U
Router
e in the
ad
M
Line
Interface
Internet
Ethernet
LAN
Customer’s Site
Figure 1.
A
S
U
e
th
in
e
d
a
M
X
E1
R
X
T
e
n
i
L
t
e
n
r
e
h
t
E
r
e
w
o
P
er
w
Po
Service Provider’s Network
Router with serial interface, configured as PPP Half Bridge.
Figure 1 shows a typical router with a serial interface configured as a PPP Half
Bridge. The router serial interface connects to the WAN via a MT311A (V.35) E1
NTU and to the remote MT330A with support for PPP bridging. The MT330A
functions as a node on the remote Ethernet network. The serial interface on the
router will have an IP address on the same Ethernet subnet as the bridge.
For example, the customer site is assigned the addresses 192.168.1.0/24 through
192.168.1.1/24. The address 192.168.1.1/24 is also the default gateway for the
remote network. The above settings remove any routing/forwarding intelligence
from the MT330A. The associated router configuration will set serial interface
(s0) to accommodate half bridging for the above example.
!
interface s0
ppp bridge ip
ip address 192.168.1.1 255.255.255.0
!
Authentication is optional under PPP. In a point-to-point leased-line link, incoming customer facilities are usually fixed in nature, therefore authentication is generally not required.
Some networking systems do not define network numbers in packets sent out
over a network. If a packet does not ha ve a specific destination netw ork number , a
router will assume that the packet is set up for the local segment and will not forward it to any other sub-network. However, in cases where two devices need to
communicate over the wide-area, bridging can be used to transport nonroutable protocols.
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G.703 NTU W/10BASET
3. Configuration
The MT330A features configuration capability via hardware DIP switches. This
section describes all possible DIP switch configurations of the MT330A.
3.4 DIP Switch Configurations
The MT330A has an internal DIP switch that enables configuration for a wide
range of applications. The DIP switch is accessed from the underside. Figure 2
shows the location of the DIP switches on the bottom of the printed circuit board.
Rear
S1
Front
Figure 2.
ON
OFF
Underside of MT330A, showing location of DIP switches
The DIP switches can be configured as either “ON” or “OFF”. Figure 3 shows
the orientation of the DIP switches with respect to ON/OFF positions.
Figure 3.
10
Close-up view of configuration switches
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G.703 NTU W/10BASET
3.4.8 S
WITCH
S1
SETTINGS
Table 1 shows the settings for DIP switch S1-1 thru S1-8.
Table 1:
Switch Description Setting
S1-1 Line Coding Off = HDB3
S1-2 Line Loopback (toward
E1 line)
Note
The MT330A, when in
line loopback mode,
will loop the network
line and return any trafic
received on the E1 line
to the sending device at
the remote end.
S1-3 Reserved Off = Default
S1-4 Reserved Off = Default
S1-5 Reserved Off = Default
S1-6/S1-7 Clocking Switch
S1-8 Reserved Off = Default
Switch S1 settings
1-6
On
On
Off
Off
On = AMI
Off = LLB disabled
On = LLB enabled
Switch
1-7
On
Off
On
Off
Network
Internal (default)
Reserved
Network
3.4.9 SW1-1 L
INE CODING
Use Switch SW1-1 to control the Network Line Coding options. Set these
options to be the same as the Line Coding given to you by your Service Pro vider.
If you are using two MT330As together as short range modems, set both units
to HDB3.
: HDB3 (
SW1-1 Line Encoding
Off HDB3
On AMI
DEFAULT
)
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G.703 NTU W/10BASET
Options:
HDB3
•
HDB3, AMI
. In this line coding, the transmitter substitutes a deliberate bipolar violation when excessive zeros in the data stream are detected. The receiver recognizes these special violations and decodes them as zeros. This method enables
the network to meet minimum pulse density requirements. Unless AMI is
required in your application, HDB3 should be used whenever possible.
AMI
•
. Alternate Mark Inversion defines a pulse as a "mark,” a binary one, as
opposed to a zero. In an E1 network connection, signals are transmitted as a
sequence of ones and zeros. Ones are sent as pulses, and zeros are sent as
spaces, i.e., no pulse. Every other pulse is inverted from the previous pulse in
polarity , so that the signal can be ef fectively transmitted. This means, however,
that a long sequence of zeros in the data stream will cause problems, since the
NTU receiving the signal relies on the signal to recov er the 2.048 Mbps clock.
Note
If you must use AMI, you should ensure that the data terminal equipment
connected to the unit provides a minimally acceptable pulse density. For
this reason, there are advantages to using HDB3 instead. AMI coding
does not inherently account for ones density. To meet this requirement,
the user should ensure that the data inherently meets pulse
density requirements.
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G.703 NTU W/10BASET
4. Installation
Once the MT330A is properly configured, it is ready to connect to the G.703
interface, to the Ethernet port, and to the power source. This section describes
how to make these connections.
4.5 Connecting to the G.703 Network and Ethernet LAN
This section describes installing the G.703 (75-ohm and 120-ohm), Ethernet
LAN, and power connections. Refer to the following to detemine which installation procedures you will use:
•
The 75-ohm dual-coax female BNCs (TXand RX) are used for connecting to a
75-ohm dual coax G.703 network interface. If your G.703 network terminates
via dual coaxial cables, refer to section “Connecting Dual Coaxial Cable (75
ohm) to the G.703 Network” on page 14
The 120-ohm RJ-48C jack is used for connecting to a 120-ohm twisted-pair
•
G.703 network interface. If your G.703 network terminates with a RJ-48C,
refer to section “Connecting the Twisted Pair (120 ohm) to the G.703 Network” on page 15.
•
The Ethernet 10Base-T port is configured as DTE (Data Terminal Equipment).
If the MT330A is to connect to another DTE device such as a 10Base-T network interface card in a PC, refer to “Connecting the 10Base-T Ethernet port to
a PC (DTE)” on page 15. Otherwise, refer to “Connecting the 10Base-T Ethernet Port to a Hub” on page 16.
Refer to “Power Connection” on page 16 to connect the MT330A to a 100–240
•
VAC source or to a 36–60 VDC DC-to-DC adapter.
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G.703 NTU W/10BASET
Made in the USA
TX
RX
Line
Line
Power
Ethernet
Ethernet
(120 ohm)
RX
(75 ohm)
(75 ohm)
Power
4.5.10 C
G.703 N
Figure 4.
ONNECTING DUAL COAXIAL CABLE
ETWORK
MT330A rear panel
(75
OHM) TO THE
Refer to Figure 4 to make the proper connections.
Note
The outer conductor of the coax cables are isolated from system
earth ground.
When using the 75-ohm interface, jumper straps JP2, JP5, JP6, and JP7 must be
installed over the jumpers. The jumpers are located next to the BNC connectors.
Do the following to configure the jumpers:
TX
1. Open the case by inserting a screwdriver into the slots and twist the screwdriver head slightly. The top half of the case will separate from the lower
half of the case. Take caution not to damage any of the PC board mounted
components
2. Open the case and install jumper straps for JP2, JP5, JP6, and JP7.
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G.703 NTU W/10BASET
4.5.11 C
ONNECTING THE TWISTED PAIR
(120
OHM) TO THE
G.703 N
ETWORK
Refer to the pinout and signals chart in Figure 5 to connect the 120-ohm G.703
network channel.
ire)
5
4
1
2
3
6
G.703
NETWORK SIGNAL
RX+
RX-
TX+
TX-
Shield
Shield
(No Connection) 8
(No Connection) 7
(No Connection) 6
(TX+) 5
(TX-) 4
(No Connection) 3
(RX-) 2
(RX+) 1
RJ-45 Cable (8-W
MT330A
SIGNAL PIN#
TX+
TX-
RX+
RX-
Shield
Shield
8
7
6
5
4
3
2
1
4.5.12 C
ONNECTING THE
Figure 5.
10B
G.703 120-ohm connection.
-T E
ASE
THERNET PORT TO A
PC (DTE)
To connect the MT330A to another DTE device such as a 10Base-T network
interface card, construct a 10Base-T crossover cable and connect the wires as
shown in Figure 6 below and Figure 7 on page 16.
1 TD+ (data output from 2707/I)
2 TD- (data output from 2707/I)
3 RD+ (data input to 2707/I)
4 (no connection)
5 (no connection)
6 RD- (data input to 2707/I)
7 (no connection)
8 (no connection)
Figure 6.
1
2
3
4
5
6
7
8
Connecting the 10Base-T Ethernet Port to a PC
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G.703 NTU W/10BASET
10Base-T Port
RJ-45 Pin No.
4.5.13 C
1 (TD+)
2 (TD-)
3 (RD+)
6 (RD-)
Figure 7.
ONNECTING THE
10Base-T cross-over cable connection
10B
ASE
-T E
THERNET PORT TO A HUB
10Base-T DTE
RJ-45 Pin No.
1 (TD+)
2 (TD-)
3 (RD+)
6 (RD-)
The 10Base-T interface is configured as DTE (data terminal equipment), just like
a 10Base-T network interface card in a PC. Therefore, it “e xpects” to connect to a
10Base-T Hub using a straight-through RJ-45 cable. Refer to Figure 8 below and
Figure 6 on page 15 to construct a cable to connect the 10 Base-T interface to a
10Base-T hub.
10Base-T Port
RJ-45 Pin No.
1 (TD+)
2 (TD-)
10Base-T Hub
RJ-45 Pin No.
1 (RD+)
2 (RD-)
4.5.14 P
3 (RD+)
6 (RD-)
Figure 8.
OWER CONNECTION
Connecting the 10Base-T Ethernet port to a hub
3 (TD+)
6 (TD-)
The MT330A uses a 5VDC, 2A universal input 100–240VAC, power supply
(center pin is +5V). The univ ersal input power supply has a male IEC-320 power
entry connector . This po wer supply connects to the MT330A by means of a barrel
jack on the rear panel. Many international power cords are available for the universal power supply.
Note
The MT330A powers up as soon as it is plugged into an AC outlet—
there is no power switch.
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G.703 NTU W/10BASET
5. Operation
When the MT330A has been properly configured and installed, it should operate
transparently. This section describes power-up, LED status monitors, and the
built-in loopback test modes.
5.6 Power-up
Before applying power to the MT330A, please review section “Power Connection” on page 16 to verify that the unit is properly connected to the appropriate
power source.
5.7 LED Status Monitors
The MT330A features six front panel LEDs that monitor connections on the
G.703 and 10Base-T links, signaling, error and test modes. Figure 9 shows the
front panel location of each LED. Table 2 on page 18 lists descriptions of
each LED.
Status
Link
10BT
E1
10BT Link
E1 Link
Figure 9. MT330A front panel
G.703 NTU w/10BaseT
TM
TM
Status
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G.703 NTU W/10BASET
Table 2: LED descriptions
LED Description
E1 Link (Active Green) Solid green (On) indicates that the end to
end E1 Link is up, signifying that the link is activ e. The E1
Link LED is Off when the link is down.
10BT Link (Active Green) Solid green indicates that the 10Base-T
Ethernet interface has detected a valid SQE heartbeat,
signifying a valid 10Base-T connection.
Status Blinks yello w from one to ele ven times to indicate system
status. Each pulse pattern is separated by a 2 second
“off” period. Greater pulse patterns have higher priority
(buffer satur ation has greater priority than an empty MAC
table). Valid system statuses are:
1 pulse—system status is okay
2 pulses —no MAC entries in the MAC Address Table
3 pulses—Clear to Send (CTS) or Carrier Detect (DCD)
from base unit are not asserted
4 pulses—IM1/I buffer is saturated
5 pulses —WAN receive frame(s) too large
6 pulses —WAN receive frame(s) not octet aligned
7 pulses—WAN receive frame(s) aborted
8 pulses—Detected WAN receive frame(s) with CRC
9 pulses—Detected LAN receive frame(s) too large
10 pulses—Detected LAN receive frame(s) not
octet aligned
11 pulses—Detected LAN receive frame(s) with
bad CRC
TM (Active Yellow) Solid Yellow indicates an Active
Test Mode.
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G.703 NTU W/10BASET
5.8 Operating Line Loopback (LL)
The Line Loopback (LL) test checks the operation of the local MT330A, and is
performed separately on each unit.
G.703 NTU
MT330A
2 Mbps G.703
Network
Clock/
Data
Clock/
Data
Figure 10. Line loopback for a network termination application
Cable Span
Network
Clocking
Data
MT310A
Ethernet
Device
To perform an LL test, set DIP switch S1-2 to On. The TM LED will be lit while
the unit is in loopback test mode.
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G.703 NTU W/10BASET
A. G.703 Specifications
A.1 Network Data Rate
2.048 Mbps
A.2 Network Connector
RJ-48C/Dual Coax BNC
A.3 Nominal Impedance
75/120 ohm
A.4 Line Coding
Selectable AMI or HDB3
A.5 Line Framing
G.703 (Unframed)
A.6 Clocking
Internal or Network (Receive Recover)
A.7 Distance
Maximum 6,000 ft (1.6 km) On 24 AWG cable
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B. Ethernet 10Base-T Specifications
B.8 DTE Interface
10Base-T on RJ-45F
B.9 DTE Data Rates
10 Mbps
B.10 LAN Connection
RJ-45, 10Base-T, 802.3 Ethernet
B.11 Protocol
PPP (RFC 1661) with Bridging Control (RFC 1638)
G.703 NTU W/10BASET
B.12 MAC Address Table Size
4096 entries
B.13 MAC Address Aging
MAC addresses deleted after 8 minutes of inactivity
B.14 Frame Buffer
512 Frames
B.15 Frame Latency
1 frame
B.16 Diagnostics
Line Loopback
B.17 Indicators
E-1 Link, 10Base-T Link, Ethernet Status, Test Mode
B.18 Configuration
8-Position DIP Switch
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G.703 NTU W/10BASET
B.19 Power Supply
5 VDC external power supply 100–240VAC, 50–60Hz, 0.4A
B.20 Humidity
Up to 90% non-condensing
B.21 Temperature
0–50°C (32–122°F)
B.22 Dimensions
3.5L x 2.1W x 0.78H in.(9.0L x 5.3W x 2.0H cm)
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G.703 NTU W/10BASET
Notes
________________________________________________________________
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BLACK BOX
NETWORK SERVICES
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