Black Box Abeo G.703 LAN Installation and operating instructions

Manual and
Installation guide
AAbbeeoo GG..770033 LLAANN
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MXU9020

Abeo LAN over X.21/V.35 Extenders
Chapter 1 Introduction
1.1 About the unit 2
1.2 Performance 3
1.3 Safety 3
1.4 Electromagnetic Compatibility 3
1.5 EN55022 Declaration 3
1.6 FCC Declaration 3
Chapter 2 Description of parts
2.1 Rear Panels 4
2.2 Status Display - Rear Panel 4
2.3 Status Display - LAN ports 4
2.4 Power Supply 5
2.5 Unbalanced BNC E1 Line Port 5
2.6 Balanced RJ-45 E1 Line Port 6
2.6.1 Connecting to a terminal device 6
2.6.2 Connecting to a network device 7
2.6.3 RJ-45 Connector layout 7
2.6.4 Cable lengths and types 8
2.7 LAN Ports 9
Chapter 3 Installation and Set-up
3.1 Setting-up the bit switches 10
3.1.1 Bit switch definitions 10
3.1.2 Timing 11
3.1.3 E1 Port select RJ-45/BNC 11
3.1.4 Loopback test 11
3.1.5 LAN mode 11
3.1.6 Auto MD /MD -X 11
3.1.7 E1 Line Port 11
Chapter 5 Specifications
5.1 Unit Specifications 15

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The Black Box MXU9020 is a four port auto-sensing 10/100BASE-T Ethernet Switch with an E1
Uplink. The product can be used to extend four LAN ports across a WAN link to a remote site.
Each LAN port may be connected to a single LAN workstation or to a hub or switch
supporting multiple workstations. The exact configuration will depend upon the user’s
network design and workload characteristics.
The MXU9020 Ethernet switch can switch between local LANs connected to its four ports,
and the unit may thus reduce the need for local LAN hubs and switches. The Ethernet switch
has full wirespeed filtering so that the WAN port carries only traffic destined for the remote
WAN-linked site, and an efficient HDLC encapsulation of packets ensures maimum
throughput over the WAN link. There is internal packet buffering to smooth out bursty
traffic. MXU9020’s are used in pairs, one on either side of a WAN link.
1.1 A out the MXU9020
MXU9020
MXU9020

Switching and filtering is performed at wirespeed: 148810 packets/second
The MXU9020 can handle a traffic level of 4064 packets/second over the E1 link.
The MXU9020 should not be connected to cabling which would be required by BS6701 to be
equipped with over-voltage protection. The following ports are designated SELV (Safety
Extra Low Voltage) within the scope of EN41003:
E1 Line (or WAN) port (BNC or RJ45)
4 x 10/100BASE-T Ethernet ports
These ports should only be connected to SELV ports on other equipment in accordance with
EN60950 clause 2.3.
n order to ensure EMC compliance all signal and data cables and connectors must use a
screened connector shell with a screened cable. The cable screen must be terminated to the
screened connector shell and not connected to any pins of the connector. Failure to use the
correct connector may compromise EMC compliance.
The MXU9020 is a Class A product. n a domestic environment it may cause radio
interference in which case the user may be required to take adequate measures.
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commerical
environment. This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the isntruction manual, may cause harmful
interference to radiocommunications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the
interference at their own expense.
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1.2 Performance
1.3 Safety
1.4 Electromagnetic Compati ility
1.5 EN55022 Declaration
1.6 FCC Declaration

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All connections into and out of the MXU9020 are made through the rear panel which is
shown in schematic form below for both AC and DC powered models.
There is a status LED on the right hand side of the rear panel which indicates the status of
the unit as shown in the figure below.
Each LAN port RJ-45 connector on the rear panel has two miniature LEDs mounted on it. The
left hand (green) LED shows link activity, and the right hand (yellow) LED shows operation at
100Mbps when it is illuminated.
2.1 Rear Panel
2.2 Status Display - rear panel
Black Box MXU9020-DC
Black Box MXU9020
Status LED Meaning
Off No mains power present
On Green Status OK
On Red E1 WAN port LOS Alarm
2.3 Status Display - LAN Ports

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2.4 Power Supply
The MXU9020 is powered by a mains supply with an input voltage of 100-250VAC, 50-60Hz
with an input current of 60 to 24mA, and an input consumption of 6 watts approximately.
The MXU9020 is provided ex-factory with a 250mA internal fuse. Mains power is connected
via the EC inlet on the rear of the unit.
An alternative -48VDC powered unit is available. The input voltage and current ranges are
-36 to -72 volts DC, 200-100mA. A Buccaneer type socket is fitted to the rear panel, and a
plug is provided with the unit for the customer’s own wiring. The connections are labelled on
the rear panel of the MXU9020.
Note: The MXU9020 must be connected to mains safety earth for correct operation.
Excessive voltages are present inside the unit. There are no user serviceable parts inside the
unit, and the cover should not be removed by unqualified personnel. The unit must not be
exposed to damp or condensing conditions.
The network is connected to the BNC connectors at the rear of the unit as shown below:
Cable lengths should be restricted to those defined below. The total maximum attenuation
of each of the cables attached to the network port must not exceed 6dB whne measured at
1.024 MHz. The frequency/attenutation characteristic of the cables attached to the network
port shall follow a root frequency law.
Pin No, Connection
1 -48VDC
2 Ground
3 0VDC
2.5 Un alanced BNC E1 Line Port
Pin Function
Tip Signal
Ring Shield
Cable Max Length (metres)
UR202 720
RG59U 600
BT2002 650
BT2003 680

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2.6 Balanced RJ-45 E1 Line Port
The layout of the female RJ-45 line or network port mounted on the rear panel is shown
below.
A connecting cable from the network port to a terminal port such as a router or a PABX is
straight through. Connections are defined in the table below.
Pin Function
1 Tx tip
2 Tx ring
3 Tx shield
4 Rx tip
5 Rx ring
6 Rx shield
7 Not connected
8 Not connected
2.6.1 Connecting to a terminal device
DSU port pin DSU port
function
erminal
port pin
erminal
port function
1 Tx tip 1 Rx tip
2 Tx ring 2 Rx ring
3 Tx shield 3 Rx shield
4 Rx tip 4 Tx tip
5 Rx ring 5 Tx ring
6 Rx shield 6 Tx shield
7 Not connected Not connected Not connected
8 Not connected Not connected Not connected

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2.6.2 Connecting to a network device.
A connection from the network port to a network device such as an E1 line or an NTU
requires a crossover cable. Connections are defined in the table below.
The figure below shows both the plug and socket head on so that any connecting wires are
behind the connector. The connector numbering is shown.
DSU port pin DSU port
function
Network
port pin
Network
port function
1 Tx tip 4 Rx tip
2 Tx ring 5 Rx ring
3 Tx shield 6 Rx shield
4 Rx tip 1 Tx tip
5 Rx ring 2 Tx ring
6 Rx shield 3 Tx shield
7 Not connected Not connected Not connected
8 Not connected Not connected Not connected
2.6.3 RJ-45 Connector layout.

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2.6.4 Ca le lengths and types
Cable lengths should be restricted to those defined below:
Note: The totoal maximum attenuation of the cable attached to the network port must not
exceed 6dB when measured at 1.024 MHz. The frequency/attenuation characteristic of the
cables attached to the network port shall follow a root frequency law. This port type is
approved to CTR12, CTR13.
Pin Max Length (Metres)
Belden 8132 (28 AWG) 175
Belden 9841 (24 AWG) 300

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2.7 LAN Ports
The four LAN ports are supported by an array of four RJ-45 female connectors mounted on
the rear panel of the MXU9020.
These ports automatically sense the LAN interface and switch between MD and MD -X
configurations. This removes the potential requirement for Crossover cables when
connecting LANs to the MTU9020 whatever LAN equipment is being used. The ports also
automatically sense the LAN speed and operate at either 10 Mbps or 100 Mbps, and sense
whether operation should be in full or half duplex mode.
There is a miniature LED on the lower right corner of each RJ-45 socket on the rear panel
which is illuminated yellow when operation is at 100 Mbps. The miniature LED on the lower
left corner of each RJ-45 socket is illuminated green when the link is active.
The RJ-45 connector layout for an auto-sensing MD /MD -X port is shown below.
Pin No. MDI Signal MDI-X Signal
1 Tx Data +ve Rx Data +ve
2 Tx Data -ve Rx Data -ve
3 Rx Data +ve Tx Data +ve
4 Not Connected Not Connected
5 Not Connected Not Connected
6 Rx Data -ve Tx Data -ve
7* Not Connected Not Connected
8 Not Connected Not Connected
The pin numbering for the connector is shown below:

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3.1 Setting up the it switches
The bit-switches on the base of the unit must be set-up before making any connections to
the unit. There is an explanatory label on the unit’s base which defines the bit-switch set-up
options and alarms.
www.blackbox.co.uk
MXU9020
BLACK BOX®
White
with
5th black
diamond
3.1.1 Bit-switch definitions
The default settings of the bit-switch are shown in bold.
Bit-switch Control On Off
1 Timing mode nternal Loop
2 E1 Port select BNC RJ-45
3 Loopback test None Remote
4 Normal
5 Normal
6 Normal
7 LAN Mode 100M FD Auto-negotiate
8 Auto MD /MD -X Disabled Enabled

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3.1.2 Timing
TIMING determines the source for the L NE E1 transmit clock, and is set by bit-switch no1. The
options are ON or OFF.
With the switch set to ON, the E1 transmit clock is derived from the MXU9020’s own internal
oscillator.
With the switch set to OFF, the E1 transmit clock is derived from the L NE E1 receive clock.
3.1.3 E1 Port select RJ-45/BNC
3.1.4 Loop ack test
This switch is used to initiate loop testing. t is fully described in the next section.
The switch is set to ON for normal operation of the unit without any loopbacks.
With the switch set to OFF, Loopback is applied, so that Trasnmit data = Received data on the
E1 port.
3.1.6 Auto MDI/MDI-X
With switch set to ON ,the LAN ports are fixed as MD -X for direct connection to a PC. This
may be necessary for reliability when connecting some older non-autos hubs.
With switch set to OFF, the LAN ports automatically sense the interface and switch between
MD and MD -X connections.
This single switch is used to select which type of connector (RJ-45 or BNC) is to be used to
connect the E1 line.
With the switch set to ON, the BNC ports are selected to give G.703 75 ohm unbalanced
interface.
With the switch set to OFF, the RJ-45 port is seleceted to give G.703 120 ohm balanced
interface.
3.1.5 LAN mode
Bit-switch ON: 100 Mbps Full Duplex operation.
Note that this option enables 100m full duplex connection to be implemented. Auto-negoti-
ate does not distinguish betweenfull versus half duplex modes when negotiating with a
fixed (i.e. non-negotiating) 100 Mbps port.
Bit-switch OFF: Auto-negotiate Mode (default).
3.1.7 E1 Line Port
Bit-switch ON: The LAN ports are fixed as MD -X for direct connection to a PC. This may be
necessary for reliability when connecting some older non-auto hubs.
Bit-switch OFF: The LAN ports automatically sense the interface and switch between MD and
MD -X connections.

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3.1.8 MAC FCS
On older units, bit-switch 7 to enabled the transmission of the MAC FCS. This function has
now been disabled and the MXU9020 always strips the MAC FCS from the Ethernet packet.
3.2 Connecting up
Safety notice: Ports that are identified as SELV in this manual should only be connected to
SELV ports on other equipment in accordance with EN 60950 clause 2.3.
Step 1: Mounting
The MXU9020 is housed in a convenient 1U table top enclosure. 19 inch rackmount options
are also available, as well as rack nests for two or 18 units.
Step 2: Set up bit-switches
These switches are located on the base of the unit and are used to configure the unit.
Step 3: LAN ports
Connect the MXU9020 to the LAN ports using the four labelled RJ-45 ports on the rear panel.
Step 4: Power Supply
Finally, connect the mains power lead and re-check all connections for security. Then turn on
the power supply. Check the rear panel status LED to ensure that it is continously lit green.
Warning: Do not connect the MXU9020 to excessive voltage. Read the safety information
before continuing
3.3 Optional rackmounting
Rackmounting kits may be used to mount two MXU9020 units side by side in a 19” rack.
The rackmount kit (MTU9000M-RACK) has a recessed plate to permit fibre bends to be made
within the envelope of a 19” rack. t also has a single cut-out for all connections to the rear
of the MXU9020. The installation method is the same in all cases.
First remove the two rear panel screws securing each unit’s lid. Fasten the two MXU9020
units to the rackmount adpator plate using the screws that you have removed, as shown in
the illustrations on the next page.
Then secure the rack mounting plate complete with the two MXU9020 units to the 19” rack
using the locating holes at the ends of the adaptor plate. f you have set the bit-switches on
the base plate before fixing units to the adaptor plate, check that the settings are still
correct.

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MXU9020 MXU9020
Black Box MXU9020Black Box MXU9020
Black Box MXU9020
Black Box MXU9020Black Box MXU9020
Black Box MXU9020

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The Status LED on the MXU9020 rear panel shows alarm conditions as shown in the table:
4.1 Alarms
Step 1: Verifty the power supply
Check the status LED on the right hand side of the rear panel of the unit at both ends of the
link. f either is OFF, power is not present on that unit. Check the mains connection to the
unit. f the mains supply is satisfactory, we recommended that the unit be taken out of
service and returned to a repair centre. Unqualified users should not open the MXU9020.
Step 2: Verify the power supply the LAN links
Connect up to 4 LAN cables to the LAN ports. f the LED on the bottom left hand corner of
the RJ-45 socket goes green, or flashes green, then there is a LAN connection. f the LED
remains dark, there is no LAN connection, and investigatory action should be taken on the
LAN and/or its cables.
Step 3: Establish and verify the WAN links
f there is LAN activity, then check for WAN activity by observing the green Tx and Rx LEDs on
the rear panel. f packets are being transmitted or received the LEDs will be ON. f they are
dark, there is no traffic being forwarded over the WAN link, or there is a problem with the
WAN link. This could be bits errors on the data lines, or no clocks present.
MXU9020 with BNC connectors - Step 3A
f the status LED is red, first check that the PORT SELECT bit-switch on the base panel is set to
BNC. f it is set correctly, try swapping the E1 L NE BNC connections at that unit.
f the status LED remains red, try looping the BNC connections on the unit with a short piece
of cable. f the status LED goes steady green, the the external BNC cabling is faulty. Check for
cable continuity and network connections, etc...
MXU9020 with RJ-45 connectors - Step 3B
f the status LED is red, first check that the PORT SELECT bit-switch on the base panel is set to
BNC. f it is set correctly, check the connections on the RJ-45 cable. Check for cable continuity
and network connections.
The MXU9020 provides a TE presentation for direct connection to the network equipment. f
LOS is experienced, a cross-over cable may be required.
4.2 Trou leshooting
Status LED Meaning
Off No mains power present
On Green Status OK
On Red E1 WAN port LOS

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Other steps
t may be useful to set the AUTO MD /MD -X bit switch to D SABLED, in which case the port
presents a fixed MD -X interface to the LAN.
Note that for 100M full duplex operation between the MXU9020 and a fixed (i.e. non-
negotiating) LAN port, Bit-switch 7 must be set to 100M FD. f this is not done, the MXU9020
will operate at the correct speed, but in half-duplex mode, and with a heavy error count.
4.3 Test Loop
Set the remote MXU9020 base panel bit-switch labelled LOOPBACK to the ON position.
When the TEST LOOP is activated at the remote MXU9020, the signal received from the local
B t Error Rate Tester (BERT) unit at the E1 port is passed directly back to the BERT at the line
interface.
f the local BERT recognises its own transmissions, then the E1 link has been validated.
MXU9020

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5.1 Specifications
Serial Line Definition
E1 Line nterface
G.703 compliant, Sensitivity -10dB. Line coding HDB3.
Interface types:
75 ohm unbalanced coax (BNC) or 120 ohm balanced RJ-45.
nterface selected by bit-switch
Jitter Tolerance Per G.823.
Barrier EN 41003 compliant barrier provided on the E1 interface
Framing Unframed
Encapsulation HDLC
Clocking options E1 Line: nternal or Loop: E1 line receive clock
Line Rate 2.048 Mbps
Maximum packet rate 4064 pps (packet per second)
LED indicators Tx/Rx Packet, Alarm
Alarms E1 LOS
Diagnostics External Loop Test initiated by bit-switch
Subscriber (LAN) Ports Definition
LAN interface (4) RJ-45, Auto switched MD or MD -X, or fixed MD selected
by bit-swtich
Operating mode Auto-negotiated 10/100 Mbps, Full/Half-duplex, or 100 Mbps
FD Fixed
Port Filtering Rate 148810 pps (packet per second)
Port Switching Rate 148810 pps (packet per second)
Switch mode Any to Any
MAC address table 4096 entries
Min/Max Packet Size 64 bytes/1522 bytes
General Definition
Power Supply 100-250VAC, 50-60Hz, 60 to 24mA, or
-36 to -72 VDC, 200-100mA
Dimensions 20.2(W) x 13.2(D) x 4.4(H) cm (Unit only)
20.2(W) x 13.2(D) x 4.8(H) cm (With feet)
Environmental Range
Ambient Temperature 0oC to +45oC
Storage Temperature -20oC to +70oC
Relative Humidity 0 to 95% non-condensing
Barometric Pressure 86 KPa - 106 KPa
Disclaimer
Black Box Network Services (UK) Ltd reserves the right to revise this publication and to make
changes from time to time in the content hereof without obligation of BBNS (UK) Ltd to
notify any person of such revision or changes.