Black Box MDU9705A-V35, MDU9705A-X21 User Manual

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Compact mDSL Modem

464 Basingstoke Road, Reading, Berkshire RG2 0QN

© Copyright 2000. Black Box Catalogue, Ltd.

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 accor­dance 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 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).

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.

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Compact mDSL Modem

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Compact mDSL Modem

General Information

Thank you for your purchase of this Black Box product. This prod­uct 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 2­wire connectivity to ISPs, PTTs, and corporations using mDSL (Multi­rate 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-and­Play and inband externally accessible configuration switches. All ver­sions 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.

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Compact mDSL Modem

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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

On

S2

S3

Off

12345678

ON

OFF

ON

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

Off

Receive

Recover

Off

Off

Off

S2 SUMMARY TABLE

Factory Default

CO/CP

Unit S2-6 S2-7 Clock Mode Description

CO On On Internal Transmit clock

generated inter­nally

CO Off On External (DTE) Transmit clock

derived from
terminal inter­face

CP On Off Receive Recover Transmit clock

derived from the
received line

Off Off

Reserved

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Compact mDSL Modem

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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 loop­back 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

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Compact mDSL Modem

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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 selec­tion will be based on the lowest line rate that will support the DTE
rate.