Black Box MD1970A User manual

February 2004
0049-0119-500
MD1970A / MD1970A-DC /MD1970C Modem

Contents
CHAPTER 1INTRODUCTION............................................................................................................................3
SUMMARY OF KEY FEATURES ..........................................................................................................................3
MODELS ...........................................................................................................................................................3
USING THIS MANUAL .......................................................................................................................................3
CHAPTER 2INSTALLING THE MODEM ...........................................................................................................4
SITE PREPARATION...........................................................................................................................................4
UNPACKING YOUR HARDWARE........................................................................................................................4
ADDITIONAL ITEMS YOU NEED ........................................................................................................................4
HARDWARE OVERVIEW....................................................................................................................................4
CONFIGURING THE MODEM ..............................................................................................................................6
Jumper S1 − Carrier Detect Control...........................................................................................................9
Jumper S2 − Transmit Level........................................................................................................................9
Jumper S3 − 2-wire/4-wire Mode................................................................................................................9
Jumper S4 − Call Turnaround Squelch .......................................................................................................9
Jumper S5 − Transmit Carrier ..................................................................................................................10
Jumper S6 − Local Copy ...........................................................................................................................10
Jumper S8 − Signal and Earth Ground .....................................................................................................10
Jumper S9 − RTS-CTS Delay ....................................................................................................................10
Jumper S10 − Carrier Detect Delay..........................................................................................................11
Jumper S11 − Turnaround Squelch Time..................................................................................................11
Jumper S12 − Soft Carrier Turn Off..........................................................................................................11
Jumper S13 − Anti-Streaming ...................................................................................................................11
Jumpers S14 and S15 − Self Test or Test Pattern......................................................................................12
CONNECTING A DTE ......................................................................................................................................12
CONNECTING TO A PRIVATE LINE COMMUNICATION CIRCUIT........................................................................12
Connecting to a DC Power Source (MD1970A-DC) ................................................................................12
Connecting to an AC Power Source (MD1970C) .....................................................................................13
CHAPTER 3LEDS AND CONTROLS...............................................................................................................14
FRONT PANEL LEDS......................................................................................................................................14
FRONT PANEL TEST SWITCH ..........................................................................................................................14
CHAPTER 4TROUBLESHOOTING ..................................................................................................................17
LOCAL MODEM TEST .....................................................................................................................................17
LINE AND MODEM TEST .................................................................................................................................17
CHAPTER 5SPECIFICATIONS ........................................................................................................................18
GENERAL........................................................................................................................................................18
DIMENSIONS AND WEIGHT .............................................................................................................................18
TEMPERATURE RANGE ...................................................................................................................................18
POWER REQUIREMENTS..................................................................................................................................19
DC POWER REQUIREMENTS (MD1970A-DC)................................................................................................19
INTERFACE PIN ASSIGNMENTS .......................................................................................................................19
APPENDIX ACOMPLIANCES .........................................................................................................................20
FCC REQUIREMENTS FOR TELEPHONE-LINE EQUIPMENT ..............................................................................20
CERTIFICATION NOTICE FOR EQUIPMENT USED IN CANADA..........................................................................20
FEDERAL COMMUNICATIONS COMMISSION AND CANADIAN DEPARTMENT OF
COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS ...........................................................21
NORMAS OFICIALES MEXICANAS (NOM)ELECTRICAL SAFETY STATEMENT .................................................21
INSTRUCCIONES DE SEGURIDAD.....................................................................................................................21
Page ii

Chapter 1
Introduction
T
he BLACK BOX® MD1970A standalone modem and MD1970C rack-mount modem are Frequency Shift
Keyed (FSK) modems designed for asynchronous half-duplex communication on 2-wire private line circuits
or full-duplex communication on 4-wire private-line circuits.
Summary of Key Features
The following list summarizes the modem’s key features.
•Bell 202T compatible
•Operates over voice-grade leased lines or private lines
•0 to 1200 bps operation for unconditioned line.
•0 to 1800 bps operation for conditioned line (C2).
•Point-to-point or point-to-multipoint polling network
•4-wire full-duplex or 2-wire half-duplex leased-line configuration.
•Analog Loopback Test, Digital Loopback Test, Self Test, and Test Pattern Transmit.
•LED displays for power, RS-232 control, data status, and test mode.
Models
The BLACK BOX® modems are available in three models:
The MD1970A is a desktop modem that comes with an AC power adapter for 115/230 VAC.
The MD1970A-DC is a desktop modem that uses DC power.
The MD1970C is a rack-mount modem that installs into a standard 19-inch rack.
In this manual, the term “modem” will be used to refer to both models collectively. If information pertains to one
model only, that model will be identified by its model number.
Using This Manual
This manual contains all the information you need to install, configure, use, and test your modem.
Chapter 1 contains general information on what the modem does, contents of this manual, and contact
information for Black Box.
Chapter 2 describes how to install and configure the modem.
Chapter 3 provides general operating procedures.
Chapter 4 provides troubleshooting procedures.
Chapter 5 lists the modem’s specifications.
Page 3

Installing the Modem
Chapter 2
Installing the Modem
T
his chapter describes how to install the modem.
Site Preparation
The location where you install your modem should be:
•Within six feet of a 115 or 230 VAC grounded outlet not controlled by a wall switch
•No more than 50 feet from the data terminal equipment
•Away from extremes of temperature, humidity, and appreciable shock.
Note: Be sure that there is a 4-inch minimum space at the back of the modem for signal line and interface cable
clearance.
Unpacking Your Hardware
Your package should include at least one MD1970A or MD1970C modem, one RJ-45 jack-to-4 wire leased line
cable, and this Installation Guide. If your package contents are damaged or missing, please contact your place of
purchase immediately.
Additional Items You Need
To use your modem, you need the following additional items:
All users: an RS-232 cable to connect a data terminal. The cable must conform to the pin assignments shown on
page 19.
Standalone modem users: a two- or four-wire transmission line or leased line and power supply.
Rack-mount modem users: a modem rack and an available slot in the rack for installing the modem.
Hardware Overview
Figures 2-1, 2-2, and 2-3 show the front and back modem panels.
Page 4

Installing the Modem
Figure 2-1. Front Panel
Figure 2-2. Back Panel
On the front panel of the modem, there are:
One Power LED and six status LEDs (see page 14)
A rotary test switch (see page 14)
On the back panel of the BLACK BOX® MD1970A modem, there are:
A power cord or power input connector
A power switch for turning the modem on and off
A fuse, 3/8 amp, 250 Volt, slow-blow
A DB25 female connector for accommodating a DTE device
An RJ-45 connector for connecting to a communications line
On the back panel of the MD1970A-DC modem, there are:
A power switch for turning the modem on and off
A fuse, 1.5 amp
A DC power connector
A DB25 female connector for accommodating a DTE device
An RJ-45 connector for connecting to a communications line
Page 5

Installing the Modem
Configuring the Modem
The modem obtains some operating characteristics from jumper settings. The default jumper settings are for
common 4-wire full-duplex applications. To reconfigure the modem for 2-wire half-duplex and special applications,
you must change the default jumper settings.
To change jumper settings, push the two tabs on the back of the modem to open the modem cover and gain access to
the jumper settings on the printed circuit board (see Figure 2-4). Then set the jumpers to the desired settings and
replace the cover.
Figure 2-4. Gaining Access to the Modem Jumpers
Figure 2-5 on the next page shows the location of the modem jumpers. Table 2-1 on page 8 summarizes the jumper
settings (default settings are bold).
Page 6

Installing the Modem
Figure 2-5. Modem Jumper Locations
Page 7

Installing the Modem
Table 2-1. Jumper Settings
Jumper Function Settings See Page…
S1 Carrier Detect control -33 dBm
-43 dBm
8
S2 Transmit level 0dBm
-2 dBm
-4 dBm
-6 dBm
-8 dBm
-10 dBm
-12 dBm
-14 dBm
9
S3 2-wire/4-wire mode 2-wire
4-wire
9
S4 Call turnaround squelch Enabled
Disabled
9
S5 Transmit carrier Control
Constant
10
S6 Local copy Enabled
Disabled
10
S8 Signal and Earth ground Connected
Separate
10
S9 RTS-CTS delay 8 ms
33 ms
59 ms
219 ms
10
S10 Carrier Detect delay 6 ms
23 ms
11
S11 Turnaround squelch time (Enabled by jumper S4) 8 ms
159 ms
11
S12 Soft Carrier turn off None
8 ms
26 ms
11
S13 Anti-streaming None
4 seconds
7.6 seconds
14 seconds
28 seconds
56 seconds
11
S14 and S15 Self Test or test pattern (Tx and Rx pattern speed) 1 bps
18 bps
37 bps
75 bps
150 bps
12
Note: The jumper positions in the following sections reflect the position of the jumpers on the modem board when
you face the board as indicated in Figure 2-5 on page 7.
Page 8

Installing the Modem
Jumper S1 − Carrier Detect Control
Settings: -33 dBm (default)
-43 dBm
Jumper S1 configures the dynamic range of the modem receiver. The selections are either –33 dBm or –43 dBm. If
the incoming signal is above –24 dBm, use the default –33 dBm setting. If the modem is operated on the network,
use the –43 dBm setting.
Jumper S2 − Transmit Level
Settings: 0 dBm (default)
-2 dBm
-4 dBm
-6 dBm
-8 dBm
-10 dBm
-12 dBm
-14 dBm
Jumper S2 adjusts the modem’s transmit level. There are eight transmit level settings you can choose. By default,
the modem uses a transmit level of 0 dBm.
Jumper S3 − 2-wire/4-wire Mode
Settings: 2-wire
4-wire (default)
Jumper S3 configures the modem for 2-wire or 4-wire operation.
When configured for 4-wire full-duplex operation, jumper S5 can be strapped to maintain constant carrier from
the master modem to all slave modems at all times after the initial training. This enables the master modem to
transmit data to the slave modems, with no RTS-to-CTS delay. This is the preferred operating mode when
minimum turnaround is desired.
When configured for 2-wire half-duplex operation, the modem encounters an RTS-to-CTS delay when
transmitting to slave modems, increasing the turnaround time. Set jumper S5 to controlled carrier for 2-wire
half-duplex operation.
Jumper S4 − Call Turnaround Squelch
Settings: Enabled
Disabled (default)
Jumper S4 configures the modem’s Call Turnaround Squelch setting. For 2-wire, half-duplex communications, set
this strap to the Enabled position. In this position, the receiver is inhibited for a period of time after the local
transmitter is turned OFF. This guards against echoes caused by the transmission just completed. The time is
determined by the turnaround squelch time option (jumper S11).
Page 9

Installing the Modem
For 4-wire, full-duplex communications, keep the jumper set to the default position of Disabled.
Jumper S5 − Transmit Carrier
Settings: Control (default)
Constant
Jumper S5 places the transmitter under terminal control (default) or turns on the transmitter continuously in a 2-wire
half duplex system.
Jumper S6 − Local Copy
Settings: Enabled
Disabled (default)
Jumper S6 must be left is the default position of Disabled when operating on a 4-wire network. It is also normally
left in the default Disabled position when operating on a 2-wire network. Strapping this jumper as Disabled inhibits
the local receiver from receiving the transmission of the local transmitter.
Jumper S8 − Signal and Earth Ground
Settings: Connected
Separate (default)
Jumper S8 allows Earth GND to be tied to the modem system GND.
Jumper S9 − RTS-CTS Delay
Settings: 8 ms (default)
33 ms
59 ms
219 ms
Jumper S9 configures the modem’s RTS-CTS delay. Four choices for selecting an RTS-CTS delay are available.
Page 10

Installing the Modem
Jumper S10 − Carrier Detect Delay
Settings: 6 ms (default)
23 ms
Jumper S10 configures the modem’s Carrier Detect turn on Delay timing. The delay chosen must be consistent with
the Clear To Send delay selection of the transmitting modem and must be less than the CTS delay. The available
delays are 6 ms (default) and 23 ms. The carrier detect drop out is less than 6 ms.
Jumper S11 − Turnaround Squelch Time
Settings: 8 ms (default)
159 ms
Jumper S11 is used with the call turnaround squelch option (jumper S4). The available times are 8 ms (default) and
159 ms.
Jumper S12 − Soft Carrier Turn Off
Settings: None
8 ms (default)
26 ms
Jumper S12 configures the modem to either turn off the transmitter immediately upon release of Request To Send,
or send a Soft Carrier Turn Off signal of 900 Hz for 8 or 26 ms at the end of each transmission.
Jumper S13 − Anti-Streaming
Settings: None (default)
4 seconds
7.6 seconds
14 seconds
28 seconds
56 seconds
Jumper S13 lets you select an anti-streaming time or use no anti-streaming at all. Anti-streaming is typically used in
multi-point applications to prevent a malfunctioning slave from occupying the line indefinitely.
When anti-streaming is active, the modem can only transmit data for up to 56 seconds. Thereafter, the modem’s
transmitter is automatically turned off. The modem then looks for an ON-to-OFF transition of Request To Send
(RTS) before proceeding with normal operation.
Page 11

Installing the Modem
Jumpers S14 and S15 − Self Test or Test Pattern
Settings: 1 bps
18 bps (default)
37 bps
75 bps
150 bps
Jumpers S14 and S15 configures the modem for Self Test or Test Pattern. When the modem is in local Self Test or
Test Pattern mode, it generates a dot test pattern. The supported baud rates are 1 bps, 18 bps, 37 bps, 75 bps, or 150
bps.
Connecting a DTE
The modem back panel provides a standard, 25-pin port labeled DTE, which connects to an RS-232 device. The
connectors for this port conform to the pin assignments shown under “DTE Connector – EIA RS-232-C” on page
19.
The DTE should have a cable no longer than 50 feet, with a Cinch or Cannon plug per DB-19604-432 plus a DB-
51225-1 hood or equivalent.
Connecting to a Private Line Communication Circuit
The modem back panel provides an 8-pin RJ-45 connector labeled TELCO, which connects to a private line
communication circuit. The connectors for this port conform to the pin assignments shown under “Telco Connector”
on page 19.
Connecting to a DC Power Source (MD1970A-DC)
The MD1970A-DC back panel accepts a DC voltage source from 10 to 53 VDC and provides 500 Volts isolation.
Figure 2-3 on page 5 shows this connector. The MD1970A-DC modem comes with a grounded power cable for
attaching the modem to an acceptable DC power source. To attach this cable to the DC power connector on the back
panel:
1. Connect the positive wire from the supplied cable to the positive terminal block (labeled +) on the DC power
connector. Facing the back of the modem, this is the left terminal block.
2. Connect the negative wire from the supplied cable to the negative terminal block (labeled –) on the DC power
connector. Facing the back of the modem, this is the middle terminal block.
3. Connect the ground wire from the supplied cable to the earth ground terminal block (labeled ) on the DC
power connector. Facing the back of the modem, this is the right terminal block.
Note: Connecting the ground wire to earth ground is optional for operation. However, it is strongly recommended
that you make this connection because doing so provides surge protection for the modem.
Page 12

Installing the Modem
Connecting to an AC Power Source (MD1970A)
The MD1970A comes with an AC power adapter that connects to a 115/230 VAC power source. On the secondary
voltage side, the power adapter connects to the power block on the back of the modem. When making this
connection to the modem, align the power adapter with the positive and negative markings on the modem rear
panel.
Powering-on the Modem
To supply power to the modem, place the POWER ON switch on the modem back panel to the ON position. The
PWR LED on the front panel goes ON.
Powering-off the Modem
To turn off power to the modem, place the POWER ON switch on the modem back panel to the OFF position. The
PWR LED on the front panel goes OFF.
Page 13

Chapter 3
LEDs and Controls
T
his chapter describes the LEDs and controls on the modem.
Front Panel LEDs
Table 3-1 describes the LEDs on the modem front panel.
Table 3-1. Front Panel LEDs
LED Status
PWR ON = power is being supplied to the modem.
TM ON = the rotary switch is turned to Analog or Digital Loopback, or the switch is in the Test
Pattern transmit mode or Self Test mode and no error is detected.
CD ON = the modem is detecting a valid carrier.
RD ON = data is being received or receive data line is in a space condition.
RS ON = the Request-to-Send line from the DTE is ON.
CS ON = the Clear-to-Send line from the modem is ON.
TD ON = data to be transmitted is being furnished to the modem.
Front Panel Test Switch
The modem front panel has a five-position rotary switch that lets you select the modem’s operating mode. The five
switch positions are:
DATA use this position for normal data transmissions.
AL (Analog Loopback) this position prepares the modem for testing by the local terminal device. The
transmitter output of the modem is disconnected from the output coupling transformer and connected to the
modem receiver input. See Figure 3-1.
DL (Digital Loopback) this position configures the modem to loop back received data to the transmitter and
transmit the data to the remote end. The RS-232-C interface to the terminal is not active during this test. See
Figure 3-2.
ST (Self Test) this position inhibits the modem from transmitting and receiving data on the COMM LINE.
The RS-232-C interface to the terminal is not active during this test. See Figure 3-3.
The test pattern (dot pattern) passes through the transmitter, loops back into the receiver, is demodulated, and is
checked for errors. If errors occur, the TM LED turns OFF and remains OFF for a period of time that depends
on the pattern generator baud rate.
In Analog Loopback and Self Test modes, the received analog data is buffered, amplified by 16 dB (if output
level is set to 0 dB), and routed out on the transmit analog pair.
TTP (Transmit Test Pattern) this setting forces the transmitter on and transmits data from the test generator
to the COMM LINE. The RS-232-C interface lines (RTS, CTS, and Transmit Data) to the transmitter are not
Page 14

LEDs and Controls
active. See Figure 3-4.
The TM LED goes ON when the receive data is good. If there are errors, or if the received data does not
compare with the transmitted data, the TM LED goes off. The RS-232-C interface lines to the receiver are
active during this mode.
Figure 1 - Analog Loopback Test
DTE DTE
RECEIVER
TRANSMITTER
PAD
TRANSMITTER
RECEIVER
Local Modem
Analog LoopBack Mode
RXD
TXD
4-Wire Telephone Line
Remote Modem
Data Mode
Amplifier
Figure 3-1. Analog Loopback Test
Digital Loopback Test
DTE DTE
RECEIVER
TRANSMITTER
TRANSMITTER
RECEIVER
Local Modem
Local Digital LoopBack Mode
4-Wire Telephone Line
Remote Modem
Data Mode
Figure 3-2. Digital Loopback Test
Page 15

LEDs and Controls
DTE
TEST PATTERN TRANSMITTER
ERROR CHECK RECEIVER
PAD
Modem
Self Test Mode
4-Wire Telephone Line
Self Test
TM
TX
RX
Amplifier
Figure 3-3. Self Test
DTE DTE
TEST
PATTERN TRANSMITTER ERROR CHECK
RECEIVER
Local Modem
Send Test Pattern Mode
2-Wire Telephone Line
Remote Modem
Receive Test Pattern Mode
TM
Transmit Test Pattern
SPEED SELECT
Figure 3-4. Transmit Test Pattern
Page 16

Chapter 4
Troubleshooting
T
his chapter describes troubleshooting procedures you can use in the unlikely event you encounter a problem with
your modem.
Local Modem Test
The local modem test verifies the local modem’s transmitter, receiver, and connection to the locally attached DTE.
This test can be run either by generating a data pattern from the locally attached DTE or by having the modem
generate a test pattern.
The following procedure describes how to run the local modem test using a locally attached DTE to generate a data
pattern.
1. Using the front panel test switch, place the modem in Analog Loopback mode.
2. Turn on the Request To Send line.
3. Use the locally attached DTE to transmit the data pattern and check for data errors on the Receive Data line.
The following procedure describes how to run the local modem test using the modem test pattern instead of a data
pattern originated by the local DTE.
1. Using the front panel test switch, place the modem in Self Test mode.
2. The TM indicator should turn ON. If the indicator turns OFF or flashes, errors are occurring.
Line and Modem Test
The line and modem test verifies the local modem, the remote modem, and the communications line between them.
With this test, the local modem loops back received data to the transmitter and transmits the data to the remote
modem. These characters can originate either from a locally attached DTE or by having the modem generate a test
pattern.
The following procedure describes how to run the line and modem test using a locally attached DTE to generate a
data pattern.
1. Place the remote modem in Digital Loopback mode.
2. Place the local modem in Data mode and transmit a data pattern. Check for data errors on the Receive Data line
The following procedure describes how to run the line and modem test using the modem test pattern instead of a
data pattern originated by the local DTE.
1. Place the remote modem in Remote Test mode.
2. Place the local modem in Remote Self Test mode. The TM LED should turn ON and remain ON if the data is
error free.
Page 17

T
Chapter 5
Specifications
his chapter lists the specifications for the modem.
General
Operation: 2-wire half-duplex or 4-wire full-duplex private line operation.
Data rate: 0-1200 bps asynchronous on worst case line. 0-1800 asynchronous on C2
conditioned line
Modulation: Phase coherent. Frequency Shift Keyed (FSK)
Carrier frequencies: Mark 1200 Hz ±1%
Space 2200 Hz ±1%
Line impedance: 600 ohms ±10% transformer coupled and transient protected.
Transmitter output level: Selectable from 0 to –14 dBm, in 2 dB steps.
RTS-CTS delay: 8, 33, 59, or 219 ms
Carrier Detect delay: 6 or 23 ms OFF-to-ON, 6 On-to-OFF
Digital interface: EIA RS-232-C and CCITT V.24.
Package: Standalone, UL approved.
Turnaround squelch: 8 ms or 159 ms
Anti-streaming: Option to turn transmitter OFF after selected time, even if RTS is ON
Test features: Self Test, Analog Loopback, Digital Loopback, and Test Pattern Transmit
Dimensions and Weight
Width: 7.00 inches (17.8 cm)
Length: 9.60 inches (24.4 cm)
Height: 2.25 inches (5.7 cm)
Temperature Range
Operating: -40 to +85 degrees Celsius (MD1970A and MD1970C)
0
oto 50oCelsius (MD1970A-DC)
Storage: -40 to +85 degrees Celsius
Humidity range: 95% relative, non-condensing
Page 18

Compliances
Power Requirements
115 VAC + or – 10%: 50/60 Hz
230 VAC + or – 10%: 50/60 Hz
12 to 60 VDC
For applicable models.
DC Power Requirements (MD1970A-DC)
DC Power Supply Voltage: 10 to 53 Volts DC
DC Current Requirements: 500 mA at 12 Volts
200 mA at 24 Volts
100 mA at 48 Volts
Isolation Voltage: 500 Volts DC (between inputs to outputs)
Fuse Rating: 1.5 Amp, Slow Blow
Interface Pin Assignments
DTE Connector - EIA RS-232-C
Pin RS-232C Circuit CCITT V.24 Circuit Function
1 AA 101 Protective Ground
2 BA 103 Transmitter Data
3 BB 104 Receive Data
4 CA 105 Request to Send
5 CB 106 Clear to Send
6 CC 107 Data Set Ready
7 AB 102 Signal Ground
8 CF 109 Data Carrier Detect
9 +12 Volts Test Only
10 -12 Volts Test Only
25 Analog Loopback
Note: All interfaces on the RS-232-C digital connector conform to the requirements of EIA-RS-232-C.
Telco Connector
Pin Description
4, 5 2-wire mode: transmit/receive pair.
4-wire mode: transmit pair.
3, 6 Receive pair for 4-wire mode.
Polarity of transmit pair or receive pair is not significant. Remaining pins are not used.
Page 19

Appendix A
Compliances
FCC REQUIREMENTS FOR TELEPHONE-LINE EQUIPMENT
1. The Federal Communications Commission (FCC) has established rules which permit this device to be directly
connected to the telephone network with standardized jacks. This equipment should not be used on party lines
or coin lines.
2. If this device is malfunctioning, it may also be causing harm to the telephone network; this device should be
disconnected until the source of the problem can be determined and until the repair has been made. If this is not
done, the telephone company may temporarily disconnect service.
3. If you have problems with your telephone equipment after installing this device, disconnect this device from the
line to see if it is causing the problem. If it is, contact your supplier or an authorized agent.
4. The telephone company may make changes in its technical operations and procedures. If any such changes
affect the compatibility or use of this device, the telephone company is required to give adequate notice of the
changes.
5. If the telephone company requests information on what equipment is connected to their lines, inform them of:
a. The telephone number that this unit is connected to.
b. The ringer equivalence number.
c. The USOC jack required: RJ-11C.
d. The FCC registration number.
Items (b) and (d) can be found on the unit’s FCC label. The ringer equivalence number (REN) is used
to determine how many devices can be connected to your telephone line. In most areas, the sum of the
RENs of all devices on any one line should not exceed five (5.0). If too many devices are attached,
they may not ring properly.
6. In the event of an equipment malfunction, all repairs should be performed by your supplier or an authorized
agent. It is the responsibility of users requiring service to report the need for service to the supplier or to an
authorized agent.
CERTIFICATION NOTICE FOR EQUIPMENT USED IN CANADA
The Canadian Department of Communications label identifies certified equipment. This certification means that the
equipment meets certain telecommunications-network protective, operation, and safety requirements. The
Department does not guarantee the equipment will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the
local telecommunications company. The equipment must also be installed using an acceptable method of
connection. In some cases, the company’s inside wiring associated with a single-line individual service may be
extended by means of a certified connector assembly (extension cord). The customer should be aware that
compliance with the above conditions may not prevent degradation of service in some situations.
Page 20