Black Box MDU9705A-V35 Manuel utilisateur

TECHNICAL:

SALES:

FAX:

ADDRESS:

WEB:

(0118) 965 6000

(0118) 965 5100

(0118) 931 5001

464 Basingstoke Road, Reading, Berkshire RG2 0QN

www.blackbox.co.uk

Compact mDSL Modem

464 Basingstoke Road, Reading, Berkshire RG2 0QN

MDU9705A-V35

MDU9705A-X21

August 2000

Table of Contents

Section Page

Radio and TV Interference....................................................2

CE Notice

Service

General Information...............................................................4

Features

Description

Configuration .........................................................................5

Configuring the Hardware DIP Switches

Configuration DIP Switch Set “S2”

Configuration DIP Switch Set “S3”

NetLink Plug ‘n’ Play

Installation............................................................................11

Connecting the Twisted Pair Interface

Connecting the MDU9705A-V35 Serial Interface

Connecting the MDU9705A-V35 to a DTE Device

Connecting the MDU9705A-V35 to a DCE Device

Connecting the MDU9705A-X21 Serial Interface

Connecting the MDU9705A-X21 to a DCE or DTE Device

Opening the Case

Connecting Power

Universal Power (100 - 240VAC)

120VAC Power (US)

230VAC Power (International)

48VDC Power

Operation.............................................................................16

Power-Up

LED Status Monitors

LED Descriptions Chart

Test Modes

Overview

Loops and Patterns

Using the V.52 (BER) Test Pattern Generator

Appendix A - Specifications........................................................27

Appendix B - V.35 Interface Pin Assignments............................29

Appendix C - X.21 Interface Pin Assignments...........................30

Appendix D - Transmission Distance Chart ...............................31

Radio and TV Interference

The Compact mDSL Modem generates and uses radio frequency

energy, and if not installed and used properly—that is, in strict accor-

dance with the manufacturer's instructions—may cause interference to

radio and television reception. The Compact mDSL Modem has been

tested and found to comply with the limits for a Class A computing

device in accordance with the specifications in Subpart J 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 Compact mDSL Modem does cause interference to radio or televi-

sion 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).

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.

Compact mDSL Modem

General Information

Thank you for your purchase of this Black Box product. This prod-

uct has been thoroughly inspected and tested and is warranted for

One Year parts and labor.

Features

• Multi-Rate Symmetric DSL

• CAP (Carrierless Amplitude and Phase) Modulation

• Data Rates up to 2.304Mbps

• V.35 and X.21 Interfaces

• Interoperable with the MDU9700

• SNMP Manageable via SNMP Management Module

• NetLink Plug ‘n’ Play for Easy Installations

• Universal Power Options, 120VAC, 230VAC and -48VDC Available

• Front Panel Status Indicators

• Small, Convienent Desktop Unit

• CE Marked

Description

The Black Box Compact

mDSL Modem

provides high speed 2-

wire connectivity to ISPs, PTTs, and corporations using mDSL (Multi-

rate Symmetric Digital Subscriber Line) technology. Multi-rate DSL

offers the ability to deliver the maximum bit rate that a twisted pair line

can accommodate. Supporting multiple line rates from 144kbps to

2.320Mbps, the modem provides “megabyte” speeds to leased line,

LAN to LAN interconnection, and WAN access networks over 3.6

miles/5.8km (1.054Mbps on 24AWG/.5mm wire).

The MDU9705A-V35 provides a V.35 interface on an M/34 female

connector. MDU9705A-X21 provides an X.21 interface on a DB-15

female connector. Features include loopback diagnostics,

SNMP/HTTP remote management capabilities using NetLink Plug-and-

Play and inband externally accessible configuration switches. All ver-

sions of the Compact mDSL Modem are compatible with Black Box’s

mDSL standalone and mDSL Access rack card.

As a symmetric DSL NTU,

mDSL

offers the same data rates in

both directions over a single pair of regular telephone lines using

Carrierless Amplitude and Phase (CAP) modulation. Line connection

is made by an RJ-45 jack. Standard versions of the Compact mDSL

Modem are powered by a 100/230VAC(Universal) supply. The DC

power supply option supports any DC input between 36-72VDC.

Compact mDSL Modem

Configuration

The Compact mDSL Modem is equipped with two sets of eight

DIP switches, which allow configuration of the unit for a wide variety of

applications. This section describes switch locations and explains all

possible configurations.

Configuring the Hardware DIP Switches

The 16 external switches are grouped into two eight-switch sets,

and are externally accessible from the underside of the Compact

mDSL Modem (See Figure 1).

The two sets of DIP switches on the underside of the Compact

mDSL Modem will be referred to as S2 and S3. As Figure 2 shows,

the orientation of all DIP switches is the same with respect to “ON” and

“OFF” positions.

Figure 2. Close Up of Configuration Switches (all sets are identical in appearance)

Figure 1. Underside of Compact mDSL Modem, Showing Location of DIP Switches

Front

Back

Off

12345678

OFF

Configuration DIP Switch Set “S2”

The configuration switches on S2 allow you to specify the Clocking

Mode and to enable/disable Local and Remote Loop requests from the

V.35 DTE. Default settings of S2 are shown in the table below.

Switch S2-1, S2-2, S2-3, S2-4, and S-5:

Reserved for factory use and must remain in the OFF Position.

Switches S2-6 and S2-7: Clock Mode

Use Switches S2-6 and S2-7 to configure the 1088 for internal,

external, or receive recover clock mode.

Position Function

S2-1 Reserved

S2-2 Reserved

S2-3 Reserved

S2-4 Reserved

S2-5 Reserved

S2-6 Clock Mode On

S2-7 Clock Mode Off

S2-8 Enable Loop from DTE

Off Disabled

Off

Receive

Recover

Off

S2 SUMMARY TABLE

Factory Default

CO/CP

Unit S2-6 S2-7 Clock Mode Description

CO On On Internal Transmit clock

generated inter-

nally

CO Off On External (DTE) Transmit clock

derived from

terminal inter-

face

CP On Off Receive Recover Transmit clock

derived from the

received line

Off Off

Reserved

Compact mDSL Modem

Switch S2-8: Enable/Disable Loop Tests from DTE

Switch S2-8 may be used to allow the MDU9705A-V35 to enter loop-

back diagnostic tests (Local or Remote) when the V.35 DTE raises the

appropriate loop request pin (LLB: Pin L or RDL: Pin N). When Switch

S2-8 is in the On position, the MDU9705A-V35 will enter Local

Loopback or Remote Loopback at the request of the DTE. When

Switch S2-8 is in the Off position, the MDU9705A-V35 ignores DTE

loop requests. In the Off position, loop requests may still be initiated

by the front panel switch.

S2-8 Setting

On DTE Loopback Request Enabled

Off DTE Loopback Request Disabled

Configuration Switch Set “S3”

Use the six DIP Switches in Switch S3 to enable the DTE bit rate.

The following table summarizes default positions of DIP Switch S3.

Detailed descriptions of each switch follow the table.

Switch S3-1: DTE Rate

Use Switch S3-1 through S3-6 to set the DTE bit rate.

S3-1 S3-2 S3-3 S3-4 S3-5 S3-6 DTE Rate (kbps)

Off Off On On On On 64

On On Off On On On 128

Off On Off On On On 192

On Off Off On On On 256

Off Off Off On On On 320

On On On Off On On 384

Off On On Off On On 448

On Off On Off On On 512

Off Off On Off On On 576

On On Off Off On On 640

Off On Off Off On On 704

On Off Off Off On On 768

Off Off Off Off On On 832

On On On On Off On 896

Off On On On Off On 960

On Off On On Off On 1024

Off Off On On Off On 1088

On On Off On Off On 1152

Off On Off On Off On 1216

On Off Off On Off On 1280

Off Off Off On Off On 1344

On On On Off Off On 1408

Off On On Off Off On 1472

S3 SUMMARY TABLE

Position Function Factory Default

S3-1 DTE Rate On

S3-2 DTE Rate Off

S3-3 DTE Rate Off

S3-4 DTE Rate Off

S3-5 DTE Rate On

S3-6 DTE Rate On

S3-7 Reset Software Defaults On Normal Operation

S3-8

Transmit Data Sample Point

On Normal Operation

}

768 kbps

Compact mDSL Modem

On Off On Off Off On 1536

On On Off Off Off On 1600

Off On Off Off Off On 1664

On Off Off Off Off On 1728

Off Off Off Off Off On 1792

On On On On On Off 1856

Off On On On On Off 1920

On Off On On On Off 1984

Off Off On On On Off 2048

On On Off On On Off 2112

Off On Off On On Off 2176

On Off Off On On Off 2240

Off Off Off On On Off 2304

Switch S3-7: Reset Software Defaults

Switch S3-7 allows the user to reset the software configured factory

defaults. This will only be needed when using the SNMP Management

Module to SNMP manage your units. For more information, please

refer to the SNMP Management Module Operations Manual.

S3-7 Setting

On Normal Operation

Off Reset

Switch S3-8: Transmit Data (TD) Sampling Point

Switch 3-8 controls the Transmit Data (TD) sampling point.

S3-8 Setting Description

On Normal TD sampled on the falling

edge of the Compact mDSL

Modem Transmit

Clock (TC)

Off Invert TD sampled on the rising

edge of the Compact mDSL

Modem Transmit

Clock.

NOTE: Based on the DTE rate chosen, the Compact mDSL

Modem will automatically select the optimum line rate depending

on distance and line conditionsfor the distance. The line selec-

tion will be based on the lowest line rate that will support the DTE

rate.

Plug-and-Play

The Plug-and-Play feature allows ISPs, carriers and PTTs to

quickly upgrade the link speed for a customer without requiring the

customer to re-configure the Customer Premise (CP) Compact mDSL

Modem. This feature also allows service providers to set up all of the

configurations at the Central Office (on the rack cards) before installing

the stand alone units, saving time spent configuring or re-configuring

DIP switches.

The Plug-and-Play feature allows the user to configure the DTE rate

(bandwidth allocation, see Switches S3-1 through S3-6) of the CP unit

from the rack card at the Central Office (CO). The stand alone unit at

the Customer Premise (CP) site will automatically configure itself to the

DTE rate (Bandwidth Allocation) of the rack card. Other configuration

parameters remain in the default setting.

Follow the instructions below to activate Plug-and-Play between

CO (mDSL Rack Card and CP Compact mDSL Modem) units:

1. Set the mDSL Rack Card (CO) to either Internal or External

clocking mode as defined by the application.

2. Set the Compact mDSL Modem (CP) to “Plug-and-Play CP”

by setting all S2 and S3 DIP switches in the OFF position as

described in Figure 3, below.

When the CO and CP units connect over DSL, the CP will enter a

predefined default configuration (Receive Recovered Clocking). During

the negotiation process between the units, the CO unit will configure

the DTE rate/line rate on the CP unit as defined by the settings of the

CO unit. When additional bandwidth is required, only the configuration

of the CO unit should be changed. This feature gives ISPs, LECs and

PTTs the ability to provision bandwidth on an as needed basis to cus-

tomers.

mDSL Rack

Card (CO) 1088 (CP)

DIP Switches all in OFF position

DIP Switches or NMS configured

according to specific application

requirements

Figure 3. Typical Plug-and-Play Application

NOTE: Plug-and-Play is only available when using a

rack-mounted mDSL Rack Card as the CO unit.

DSL Span

Compact mDSL Modem

Installation

Once the Compact mDSL Modem is properly configured, it is

ready to connect to the twisted pair interface, to the serial port, and to

the power source. This section tells you how to make these connec-

tions.

Connecting the Twisted Pair Interface

The Compact mDSL Modem supports communication between two

DTE devices at distances to 5 miles (8 km) over 24 AWG (.5mm) twist-

ed pair wire. Two things are essential:

1. These units work in pairs. Both units at the end of the twisted

pair DSL span must be set for the same DTE rate.

2. To function properly, the Compact mDSL Modem needs one

twisted pair of metallic wire. This twisted pair must be

unconditioned, dry, metallic wire, between 19 (.9mm) and 26

AWG (.4mm) (the higher number gauges will limit distance).

Standard dial-up telephone circuits, or leased circuits that run

through signal equalization equipment, or standard, flat modu-

lar telephone type cable, are

not acceptable

The RJ-45 connector on the Compact mDSL Modem’s twisted pair

interface is polarity insensitive and is wired for a two-wire interface.

The signal/pin relationships are shown in Figure 5 below.

Figure 4. Compact mDSL Modem RJ-45 twisted pair line interface.

1 (N/C)

2 (N/C)

3 (N/C)

4 (2-Wire TIP)

5 (2-Wire RING)

6 (N/C)

7 (N/C)

8 (N/C)

Connecting the Compact mDSL Modem (V.35) Serial Interface

The MDU9705A-V35 supports V.35 serial port connections. This

section describes how to connect the serial ports to your V.35 equip-

ment.

Connecting the Compact mDSL Modem (V.35) to a “DTE” Device

The MDU9705A-V35 provides a V.35 DCE (Data Circuit

Terminating Equipment) interface on an M/34 female connector. As a

DCE, this interface is designed to connect to DTE equipment, such as

a router. When connecting the V.35 interface of the Compact mDSL

Modem to your DTE device, use a V.35 straight through cable (See

Figure 4, below). Appendix C describes pin assignments and signal

sources for the Compact mDSL Modem V35 interface. When purchas-

ing or constructing an interface cable, please refer to the pin diagrams

in Appendix C as a guide.

Connecting the Compact mDSL Modem (V.35) to a “DCE” Device

The MDU9705A-V35 provides a V.35 DCE (Data Circuit

Terminating Equipment) interface on an M/34 female connector. As a

DCE, this interface is designed to connect to DTE equipment, such as

a router. However, tail-circuit applications require connection to anoth-

er DCE equipment, such as a multiplexer. When connecting the V.35

interface of the Compact mDSL Modem to your DCE device, use a

V.35 null modem cable. Some applications may also require the

installation of a V.35 tail-circuit buffer to account for small differences

in clock frequency between the MDU9705A-V35 and the V.35 DCE

(Multiplexer).

Figure 5. Connecting the MDU9705A-V35 to V.35 Serial DCE

Straight-Through M/34

Cable

DSL Span

MDU9705A-V35 (DCE)

Remote Compact

mDSL Modem

V.35 Router (DTE)

DSL Span

Remote Compact

mDSL Modem

MDU9705A-V35

(DCE) V.35 Multiplexer (DCE)

Figure 4. Connecting the MDU9705A-V35 to V.35 Serial DTE

Compact mDSL Modem

Connecting the Compact mDSL Modem (X.21) Serial Interface

The MDU9705A-X21 supports X.21 serial port connections. This

section describes how to connect the serial ports to your X.21 equip-

ment.

Connecting the MDU9705A-X21 to a “DCE” or “DTE” Device

The MDU9705A-X21 provides an X.21 interface on a DB-15

female connector. The X.21 interface default configuration is DCE

(Data Circuit Terminating Equipment) for connection to DTE (Data

Terminal Equipment) such as a router. However, the X.21 interface on

the Compact mDSL Modem may be configured as DTE (Data Terminal

Equipment) for connection to DCE such as a modem or multiplexer.

When connecting the X.21 interface of the MDU9705A-X21 to your

DTE device, use a X.21 straight through cable (See Figure 6, below).

To change the DCE/DTE orientation from the

default position (DCE), you must open the case Compact mDSL

Modem case.

Opening the Case

To open the Compact mDSL Modem case, insert a flat head

screw driver into an open slot on both sides of the case, as in Figure 7.

Twist the screw driver head slightly and the top half of the case will

separate from the lower half, as in Figure 7, below. Take caution not to

Figure 6. Connecting the MDU9705A-X21 to X.21 DTE or DCE

Straight-Through 15-pin

D-Sub Cable

DSL Span

Router (DTE)

Mux (DCE)

MDU9705A-X21

(DCE or DTE)

Remote Compact

mDSL Modem

Figure 7. Opening the case with a small screwdriver

damage the pc-board mounted components.

The DCE/DTE strap is located on the top side of the MDU9705A-

X21 pc board (See Figure 8, below). The arrows on the top of the

strap indicate the configuration of the X.21 port (for example, if the

DCE arrows are pointing toward the DB-15 connector, the X.21 port is

wired as a DCE). Change the DCE/DTE orientation by pulling the

strap out of its socket, rotating it 180º, then plugging the strap back

into the socket. You will see that the DCE/DTE arrows now point in

the opposite directions, showing the new configuration of the X.21 port.

To close the case, fit the 2 halves together snugly and snap them back

in place.

Connecting Power

The Compact mDSL Modem (all versions) are available with

Universal AC (100-240VAC), 120VAC, 230VAC or -48VDC power

options. This section describes these options.

Universal AC Power (100-240VAC)

The Compact mDSL Modem 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 Compact mDSL Modem by means of a barrel

jack on the rear panel. Many international power cords are available

for the universal power supply (Please refer to Appendix B for country-

specific power cords.

The Compact mDSL Modem powers up as soon as it is plugged

into an AC outlet--there is no power switch.

DCE/DTE Strap

DB-15 Connector

Figure 8. Setting the DCE/DTE Strap

Compact mDSL Modem

120 VAC Power (US)

The 100-132 VAC adapter supplied with the U.S. version of the

Compact mDSL Modem is a wall mount type and may be plugged into

any approved 120 VAC wall jack.

230 VAC Power (International)

The 230 VAC adapter supplied with the International version of the

Compact mDSL Modem is a wall mount type and may be plugged into

any approved 230 VAC wall jack.

DC Power

The 36-60 VDC DC to DC adapter supplied with the DC version of

the Compact mDSL Modem plugs in a DC source (nominal 48VDC)

and plugs into the barrel power supply jack on the rear of the Compact

mDSL Modem. Please refer to Figure 9, below, to make the proper

connection.

Figure 9. Connecting DC Power to the 48VDC Power Supply.

WARNING! There are no user-serviceable parts in the

power supply section of the Compact mDSL Modem. Fuse

replacement should only be performed by qualified service

personnel.

To Power

Supply Jack

-Vin

+Vin

To -48VDC

Source

Operation

Once the Compact mDSL Modem is properly configured and

installed, it should operate transparently. This sections describes

power-up, reading the LED status monitors, and using the built-in loop-

back test modes.

Power Up

To apply power to the Compact mDSL Modem, first be sure that

you have read Section 4.4, and that the unit is connected to the

appropriate power source. Then power-up the unit.

LED Status Monitors

The Compact mDSL Modem features six front panel LEDs that

monitor power, the DTE signals, network connection and test modes.

Figure 10 (below) shows the front panel location of each LED.

Following Figure 10 is a description of each LEDs function. See also,

LED description chart on page 17.

DSL Link (Active Green) Solid green (On) indicates that the

end to end DSL Framer Link is up, signifying that

the link across the DSL span is active. The DSL

Link LED is Off when the link is down.

TD & RD Glows yellow to indicate an idle condition of Binary

“1” data on the respective terminal interface sig-

nals. Green indicates Binary “0” data

NS (No Signal) glows red to indicate that the local

Compact mDSL Modem is not connected with the

remote Compact mDSL Modem.

ER - blinks ON/OFF after a 511/511E test has timed

out. See Section 5.3.3 (Test Pattern Generator) for

more information.

-flashes once to indicate that a CRC error has

occurred (during normal operation) or bit errors

have occurred (during 511/511E tests).

Figure 10. Compact mDSL Modem Front Panel

Compact mDSL Modem - V.35

Compact mDSL Modem

-only at power up, blinks once every 200 ms if the

DTE Rate is set to an unsupported settings

TM glows yellow to indicate that the Compact mDSL

Modem has been placed in Test Mode. The unit can be

placed in test mode by the local user or by the remote

user. The TM LED will flash for 400msec when a valid

packet is received from the SNMP Management

Module.

Test Modes

The Compact mDSL Modem offers two proprietary loopback test

modes, plus a built-in V.52 BER test pattern generator to evaluate the con-

dition of the modems and the communication link. These tests can be acti-

vated physically from the front panel or via the DTE interface.

Overview

Figure 11 shows the major elements used in the loop-back and pattern

tests available in the Compact mDSL Modem. Each block has several func-

tions. Following Figure 11 are descriptions that show how the elements are

used during Test Modes.

Clock (CO) Internal 768Kb No DTE Clock (CP) R/R No DTE

TD RD DSL NS ER TM TD RD DSL NS ER TM

Power ON G O off ON off off O O off ON off off

DSL Link G O G off off off O G G off off off

Link Brk G O off off off off O O off off off off

Brk+ 10s G G off ON off off O O off ON off off

RDL G G G off off ON O G G off off ON

RDL+511 G G off off off ON O G off off off ON

With DTE Connected With DTE Connected

Mark O O G off off off O O G off off off

Space G G G off off off G G G off off off

Data GO GO G off off off GO GO G off off off

Link Brk = DSL Link Broken

Brk+10s = 10 Seconds following Link Break

G=GREEN

O=ORANGE

ON= ON

off= OFF

Y=yellow

5.2.1 Compact mDSL Modem LED Descriptions Chart

Figure 11: Block Diagram Compact mDSL Modem

Framer The framer is used to determine the status of

the line. In normal operation the framer transmits

and expects to receive framed packets from the

far end. If the framer receives framed packets

from the far end, CTS and CD will be active. If

framed packets are not received, CTS and CD

will be inactive. The restart procedure uses this

information to determine if a valid connection is

made (cable disconnect, poor cable quality, etc).

In normal Data Mode, if the Compact mDSL

Modem receives 4 seconds of unframed packets

it will restart and begin trying to re-establish a

connection with the far end. The distinction

between framed packets and unframed packets

becomes important when we discuss the Pattern

Generator.

Pattern Gen/Det This part of the Processor generates and

detects the 511/511E patterns. When transmit-

ting 511 patterns, the information is unframed

(because it originates after the framer) and is

intended to be evaluated only by another

Processor. If the units are in Data Mode and the

pattern generator is enabled on one end of the

link, the far end will begin receiving unframed

packets and assume that the line has gone

down. During test modes, we force the pattern

generator to time out before it can cause the link

to be killed.

Loop Control This part of the Processor is used to control

loop-backs. In a Local Loop, the data is looped

back towards the local DTE. In a Remote Loop,

the data is looped back to the line, but it is also

allowed to pass through to the framer and to the

remote DTE.

Pattern

Gen/Det Loop

Contr

Loop

Contro

Pattern

Gen/Det

Processor

Framer Framer

Line

Compact mDSL Modem

Restart Procedure The restart procedure is in place to allow the

and Time Outs units to re-establish a connection after the

framer begins seeing unframed packets. The

Test Model Timing Chart below shows the

amount of time the framer must see consecutive

unframed packets before the unit will restart and

try to establish a new line connection. The rea-

son that there are different Restart Times will

become apparent after reading the rest of the

document. The 511/511E Time Out shown refers

to the amount of time the 511/511E pattern will

be valid. At the end of this time the pattern will

automatically turn itself off and the normal data

path will be re-established. The ER led will flash

indicating to the user that the test has timed out.

The ER led will stop flashing once the 511/511E

switch is placed into the normal position.

Symbol Indicators

This symbol designates the origination or the

termination of a data path. The direction of the

arrow connected distinguish the two data paths.

This symbol designates an invalid data path. If

there is data present it should be ignored.

Test Mode Timing

Item Elapsed Time (seconds)

Start Up 50

Data Mode 4

511/511E Generator Enabled 60 (The generator will stop after 45 seconds.)

Remote End of an RDL 60

511/511E Time Out 45 (The pattern generator will automatically turn

off after 45 seconds. The ER LED will flash until

the user turns off the 511/511E switch.)

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