Datasheet MH88422-1, MH88422BD-1, MH88422-2, MH88422-3 Datasheet (MITEL)

MH88422

Data Access Arrangement

Preliminary Information

Features

• FAX and Modem interface (V29)

• Variants available with different line
impedances

• Provides reinforced barrier to international PTT
requirements

• Transformerless 2-4 Wire conversion.

• Integral Loop Switch

• Dial Pulse and DTMF operation

• Line state detection outputs

• Loop current/ringing outputs

• Single +5V operation, low on-hook power
(5mW)

• Full duplex data transmission

Applications

Interface to Central Office or PABX line for:

• Modem

•FAX

• Telemetr y

DS5067 ISSUE 10 November 1998

Ordering Informations

MH88422-1/2/3 26 Pin DIL Package
MH88422BD-1 26 Pin DIL Package

0°C to 70°C

Description

The Mitel MH88422 Data Access Arrangement
(D.A.A.) provides a complete interface between data
transmission equipment and a telephone line. All
functions are integrated into a single thick film hybrid
module which provides high voltage isolation, very
high reliability and optimum circuit design needing a
minimum of external components.

A number of variants are available to meet particular
country impedance requirements. The D.A.A. has
been designed to meet regulatory approvals
requirements in these countries.

TIP

RING

TXIN

TF

RLS

Input Buffer

&

Line Termination

Network Connections

Isolation Barrier

Opto-

Isolation

Opto-

Isolation

Opto-

Isolation

Opto-

Isolation

Logic Input

Buffer

Audio

Buffer

Audio
Buffer

Ring & Loop

Buffer

User Connections

Figure 1 - Functional Block Diagram

Transhybrid

loss

cancellation

circuit

VDD

AGND

LC

VR

VX

RVLC

2-13

MH88422 Preliminary Information

VDD

IC

AGND

IC

LC

IC

RVLC

IC
IC

IC/NP

VX

IC/NP

VR

1
2
3
4
5
6
7
8
9
10
11
12
13

26
25
24
23
22
21
20
19
18
17
16
15
14

TIP
IC
RLS
IC/NP
IC
IC/NP
TF
NP
TXIN
IC
RING
NP
IC

Figure 2 - Pin Connections

Pin Description

Pin # Name Description

1 VDD Positive Supply Voltage. +5V.

2, 4, 6,

8, 9

3 AGND Analog Ground. 4-Wire Ground. Normally connected to System Ground.
5 LC Loop Control (Input). A logic 0 activates internal circuitry which provides a line

IC Internal Connection. This pin is cropped short.

termination across Tip and Ring. Used for seizing the line and dial pulsing.

7 RVLC Ringing Voltage and Current Detect (Output). Indicates the status of loop current

and ringing voltage.

10, 12 IC/NP Internal Connection or No Pin Fitted. This pin is either cropped shor t or not fitted,

depending on the variant. See Note 1
11 VX Transmit (Output). Analog output to modem/fax chip set.
13 VR Receive (Input). Analog input to modem/fax chip set.

14, 17 IC Internal Connection. This pin is cropped short.
15, 19 NP No Pin Fitted.

16 RING Ring Lead. Connects to the "Ring" lead of a telephone line.
18 TXIN Dummy Ringer Connection. Connects to the "Ring" lead of a telephone line through a

dummy ringer capacitor.
20 TF Tip Feed. Connects externally to the RLS pin.

21, 23 IC/NP Internal Connection or No Pin Fitted. This pin is either cropped shor t or not fitted,

depending on the variant. See Note 1
24 RLS Ringing Loop Sense. Connects externally to the TF pin.
25 IC Internal Connection. This pin is cropped short.
26 TIP Tip Lead. Connects to the "Tip" lead of a telephone line.

Notes:

1. Variant 1, 4 BD-1 - pins 10,12, & 21 are cropped short. Pin 23 is not fitted.

2. Variant 2 - pin 23 is cropped short. Pins 10, 12 & 21 are not fitted.

3. Variant 3 - pins 12 and 21 are cropped short. Pins 10 and 23 are not fitted.

2-14

Preliminary Information MH88422

Functional Description

The device is a Data Access Arrangement (D.A.A.). It
is used to correctly terminate a 2-Wire analog loop. It
provides a signalling link and a 2-4 Wire line
interface between an analog loop and the
subscriber’s data transmission equipment such as
Modems, Facsimiles (Fax’s), Remote Metering and
Electronic Point of Sale equipment (EPOS).

Isolation Barrier

The device provides an isolation barrier implemented
by using optocouplers. This is a reinforced barrier for
an instantaneous power surge of up to 3kV r.m.s., for
example a lightning strike. It also provides full
isolation for a continuous AC voltage level of up to
250V r.m.s.

External Protection Circuit

Should the input voltage from the line exceed that
isolated by the optocoupler, an External Protection
Circuit assists in preventing damage to the device
and the subscriber equipment. See Figure 3.

Input Impedance

The MH88422 is available in a number of different
variants each of which has its own fixed Tip-Ring AC
input impedance (Zin). Each variant is identified by
the final digit in its part number, as listed below. Also
shown are the countries whose PTT requirements
match these impedances.

MH88422-1 Zin = 220Ω + 820Ω // 120nF
Australia / South Africa / Spain

MH88422BD-1 Zin = 220Ω + 820Ω // 115nF
German BABT ZV5

MH88422-2 Zin = 600Ω
North America

MH88422-3 Zin = 370Ω + 620Ω // 310nF
UK / New Zealand

Many of these countries now pass equipment
approved to CTR21. The MH88422 will not meet this
specification. See the MH88437 datasheet for a
CTR21 Product.

Line Termination

When Loop Control (LC) is at a logic 0, a line
termination is applied across Tip and Ring. The
device can be considered off-hook and DC loop
current will flow. The line termination consists of both
a DC line termination and an AC input impedance.

When LC is at a logic 1, a Dummy Ringer is applied
across Tip and Ring. The device can be considered
on-hook and negligible DC current will flow. The
dummy ringer is an AC load, which represents a
telephone’s mechanical ringer.

DC Line Termination

When LC is at a logic 0, an active termination is
applied across Tip and Ring, at which time it can be
considered to be in an off-hook state. This is used to
terminate an incoming call, seize the line for an
outgoing call, or if it is applied and disconnected at
the required rate, can be used to generate dial
pulses. This termination resembles approximately
300Ω resistance, which is loop current dependent.

Dummy Ringer

This device supports a dummy ringer option which
can be configured by the inclusion of external
components. Further details relating to component
values and configuration can be obtained from
MSAN-154. For example, Figure 3 shows capacitor
C2 which if set to 1.8µF would meet the New
Zealand dummy ringer requirements.

2-4 Wire Conversion

The device converts the balanced 2-Wire input,
presented by the line at Tip and Ring, to a ground
referenced signal at VX, as required by modem/fax
chip sets.

Conversely the device converts the ground
referenced signal input at VR, to a balanced 2-Wire
signal across Tip and Ring.

During full duplex transmission, the signal at Tip and
Ring consists of both the signal from the device to
the line and the signal from the line to the device.
The signal input at VR, being sent to the line, must
not appear at the output VX. In order to prevent this,

2-15

MH88422 Preliminary Information

the device has an internal cancellation circuit. The
measure of attenuation is Transhybrid Loss (THL).

The Transmit (VX) and Receive (VR) signals are
ground referenced (AGND), and biased to 2.5V. The
device must be in the off-hook condition for
transmission or reception to take place.

Transmit Gain

The Transmit Gain of the MH88422 is the gain from the
differential signal across Tip and Ring to the ground
referenced signal at VX. The internal Transmit Gain of
the device is fixed and depends on the variant as
shown in the AC Electrical Characteristics table. For
the correct gain, the Input Impedance of the MH88422
variant used, must match the specified line
impedance.

By adding an external potential divider to VX, it is
possible to reduce the overall gain in the application.
The output impedance of VX is approximately 10Ω and
the minimum resistance from VX to ground should be
2kΩ.

Characteristics table. For the correct gain, the Input
Impedance of the MH88422 variant used, must match
the specified line impedance.

The input impedance to ground of VR is 47kΩ and this
can be used with an external series resistor to form a
potential divider and reduce the overall gain in the
application.

Example: If R3 = 100kΩ, in Figure 3, the Gain would
reduce by 3.0dB.

Supervisory Features

The device is capable of monitoring the line
conditions across Tip and Ring, this is shown in
Figure 3. The Ringing Voltage Loop Current detect
pin (RVLC), indicates the status of the device. The
RVLC output is at logic 0 when loop current flows,
indicating that the MH88422 is in an off hook state.

When the device is generating dial pulses, the RVLC
pin outputs a TTL pulse at the same rate.

Example: If R1 = R2 = 2kΩ, in Figure 3, the gain would
reduce by 6.0dB.

Receive Gain

The Receive Gain of the MH88422 is the gain from the
ground referenced signal at VR to the differential
signal across Tip and Ring. The internal Receive Gain
of the device is fixed as shown in the AC Electrical

MH88422

26

C1

24

20

18

16

TIP

RLS

TF

TXIN

RING

VDD

1

+

+5V

TIP

Protection

Circuit

C2

RING

Notes:

1) R1, R2: Transmit Gain Resistors

2) R3: Receive Gain Resistor

3) C1: 10µF 6V Tantalum

4) C2: Dummy Ringer Capacitor 250V

5) C3, C4: 10µF AC coupling Capacitors

An AC ringing voltage across Tip and Ring will cause
RVLC to output a TTL pulse at double the ringing
frequency with an envelope determined by the
ringing cadence.

Mechanical Data

See Figure 10, for details of the mechanical
specification.

R2

R1

AGND

3

VX

VR

RVLC

LC

11

13

7

5

R3

C3

C4

Ring Voltage & Loop

Current Detect Output

Loop Control Input

Audio

Output

Audio

Input

2-16

Figure 3 - Typical Application Circuit

Preliminary Information MH88422

Absolute Maximum Ratings* - All voltages are with respect to AGND unless otherwise specified.

Parameter Symbol Min Max Units

.

1 DC Supply Voltage V
2 Storage Temperature T
3 DC Loop Voltage V
4 Ringing Voltage - 2 variant

- all other variants

5 Loop Current I

*Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.

DD

S

BAT

V

R

V

R

Loop

-0.3 6 V

-55 +125 ˚C

-110 +110 V

-

-2

150
120

-90mA

Recommended Operating Conditions

Parameter Sym Min Typ‡Max Units Test Conditions

1 DC Supply Voltages V
2 Operating Temperatures T
3 Ringing Voltage V

‡ Typical figures are at 25˚C with nominal +5V supply and are for design aid only

Loop Electrical Characteristics

†

4.75 5.0 5.25

DD

OP

R

02570˚C

75 90 Vrms 150 Vrms for -2 variant

Characteristics Sym Min Typ‡Max Units Test Conditions

V

Vrms
Vrms

1 Ringing Voltage

-1 V ariant Only No Detect
Detect

BD-1 V ariant Only No Detect
Detect

All other V ariants No Detect
Detect

2 Ringing Frequency

BD-1 Variant Only
All other Variants

3 Operating Loop Current

BD-1 Variant Only
All other Variants

4 Off-Hook DC Voltage

-1 Variant

-2 Variant

-3 Variant

VR

35

32

14

23
15

20
15

6.0

2.4

3.1

6.0

17

15

7

28
68

80
80

28.8

6.0

6.0

7.8

9.0

14.0

Vrms
Vrms

Vrms
Vrms

Vrms
Vrms

Hz
Hz

mA
mA

V
V

V
V
V

V
V

Externally Adjustable ­See MSAN-154

Test circuit as Fig 4
I

=19mA (See Note 1)

Loop

I

=60mA

Loop

I

=15mA

Loop

I

=20mA (See Note 2)

Loop

I

=26mA

Loop

I

=15mA (See Note 3)

Loop

I

=90mA

Loop

BD-1 Variant

6.0

6.0

10.8
27

V

I

=20mA (See Note 4)

V

Loop

I

Loop

=50mA

2-17

MH88422 Preliminary Information

Loop Electrical Characteristics† (continued)

5 Leakage Current

(Tip or Ring to AGND)

10 µA 100V DC

6 Leakage Current on-hook

910µΑ V

(Tip to Ring)

7 DC Resistance during dialling

-1 Variant
All other V ariants

200
260

220
280

Ω
Ω

8 Dial Pulse Distortion

BD-1 Variant ON
OFF
All other Variants ON
OFF

†

Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡Typical figures are at 25°C with nominal + 5V supplies and are for design aid only.
Note 1: Refer to FTZ 1TR2 section 2.2
Note 2: Refer to EIA/TIA 464 section 4.1.1.4.4
Note 3: Refer to BS6305 section 4.3.1
Note 4: Refer to ZV5 Annex 1

DC Electrical Characteristics

†

0
0
0
0

+1
+1
+2
+2

+2
+2
+4
+4

ms
ms
ms
ms

Characteristics Sym Min Typ‡Max Units Test Conditions

1 Supply Current I
2 RVLC Low Level Output Voltage

High Level Output Voltage

3 LC Low Level Input Voltage

High Level Input Voltage
Low Level Input Current
High Level Input Current

†

Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡Typical figures are at 25°C with nominal + 5V supplies and are for design aid only.

DD

V

OL

V

V

V

I

OH

I

IL

IH

2.4

IL

2.0

IH

15mA

0.4 V
V

0.8

V
V

-60

µAµAVIL= 0.0V

60

= -50V

BAT

I

= 20 - 40 mA

Loop

V

= 5.0V, On-hook

DD

IOL= 4mA
IOH= 0.4mA

VIH= 5.0V

2-18

Preliminary Information MH88422

AC Electrical Characteristics† - MH88422 All Variants

Characteristics Sym Min Typ

1 Input Impedance VR 47k Ω
2 Output Impedance at VX 10 Ω

‡

Max Units Test Conditions

3 Receive Gain (VR to 2-Wire) 2.5 3.5 4.6

dB

Test circuit as Fig 6
Input 0.5V at 1kHz

4 Frequency Response Gain

(relative to Gain @ 1kHz)
All V ariants -1

5 Signal Output Overload Level

at 2-Wire
at Vx

6 Total Harmonic Distortion

BD-1 V ariant at 2-Wire
All other V ariants at 2-Wire
All V ariants at VX

7 Power Supply Rejection Ratio

PSRR
BD-1 Variant at 2-Wire
at VX

All other Variants at 2-Wire
at VX

-1

+2.0
+2.0

THD

18
18

12
12

0
0

+3.0
+3.0

1.2

1.2

1.2

40
40

20
20

+1
+1

2.0

2.5

2.0

dB
dB

dBm
dBm

%
%
%

dB
dB

dB
dB

300Hz
3400Hz

THD < 5% @ 1kHz
I

= 20 to 40mA

Loop

Input -3.5dBm at 1kHz

Ripple 0.1Vrms 1kHz
on V

DD

8 Transhybrid Loss THL 6 20 dB Test circuit as Fig 6

Input -3.5dBm,
300-3400Hz at V

†

Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡Typical figures are at 25°C with nominal +5V and are for design aid only.
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.
Note 2: dBm is referenced to 600Ω unless otherwise stated.

R

2-19

MH88422 Preliminary Information

AC Electrical Characteristics† - MH88422-1

Characteristics Sym Min Typ‡Max Units Test Conditions

1 Return Loss at 2-Wire

(220Ω + 820Ω //120nF)

2 Longitudinal to Metallic Balance

3 Idle Channel Noise

at 2-Wire

at VX

4 Transmit Gain (2-Wire to Vx)

RL

Nc

20
20
20

40
55
53

22
24
26

65
60
60

-79

-73

-72

-58

dB
dB
dB

dB
dB
dB

dBmp
dBmp

-1.4 -0.4 0.9 dB

Test circuit as Fig 7
300-500Hz
500-2500Hz
2500-3400Hz

Test circuit as Fig 8
50-300Hz
300-1000Hz
1000-4000Hz

Test circuit as Fig 5
Input 0.5V @ 1kHz
Off -Hook

5 Frequency Response Gain

(relative to Gain @ 1kHz)

†

Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡ Typical figures are at 25C with nominal +5V and are for design aid only
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.

-1.6

-2.1

-0.6

-0.5

0.4

0.9

dB
dB

300Hz
3400Hz

AC Electrical Characteristics† - MH88422-2

Characteristics Sym Min Typ

‡

Max Units Test Conditions

1 Return Loss at 2-Wire

(Reference 600Ω)

2 Longitudinal to Metallic Balance

Metallic to Longitudinal Balance

3 Idle Channel Noise

at 2-Wire

at VX

4 Transmit Gain (2-Wire to Vx)

ERL

SFRL

Nc

20
14

58
53

60
40

30
19

60
55

13
13

20
20

dB
dB

dB
dB

dB
dB

dBrnC
dBrnC

-1.4 -0.4 0.9 dB

Test circuit as Fig 7
500-2500Hz
200-3200Hz

Test circuit as Fig 8
200-1000Hz
1000-3000Hz
Test circuit as Fig 9
200-1000Hz
1000-4000Hz

Test circuit as Fig 5
Input 0.5V @ 1kHz
Off- Hook

5 Frequency Response Gain

(relative to Gain @ 1kHz)

†

Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡ Typical figures are at 25C with nominal +5V supply and are for design aid only
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.

-1.6

-2.1

-1.3

-0.5

0.4

0.9

dB
dB

200Hz
3400Hz

2-20

Preliminary Information MH88422

AC Electrical Characteristics† - MH88422-3

Characteristics Sym Min Typ‡Max Units Test Conditions

1 Return Loss at 2-Wire

(370Ω + 620Ω // 310nF)

2 Longitudinal to Metallic Balance

3 Idle Channel Noise

at 2-Wire

at VX

4 Transmit Gain (2-Wire to Vx)

RL

Nc

16 20 dB

50 60 dB

-80

-80

-70

-68

dBmp
dBmp

-1.4 -0.4 0.9 dB

Test circuit as Fig 7
200-4000Hz

Test circuit as Fig 8
300-3400Hz

Test circuit as Fig 5
Input 0.5V @ 1kHz
Off-Hook

5 Frequency Gain

(relative to gain @ 1kHz)

†

AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡Typical figures are at 25°C with nominal +5V and are for design aid only.
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.

-1.6

-2.1

-1.3

-0.5

0.4

0.9

dB
dB

300Hz
3400Hz

AC Electrical Characteristics† - MH88422BD-1

Characteristics Sym Min Typ‡Max Units Test Conditions

1 Return Loss at 2-Wire

(220Ω + 820Ω // 115nF)

RL

16 22 dB

Test circuit as Fig 7
300-3400Hz
Ref ZV5 Sec 2.5.2 and

2.8.3

2 Longitudinal to Metallic Balance

30
40
46

65
60
60

dB
dB
dB

Test circuit as Fig 8
50-300Hz
300-600Hz
600-4000Hz
Ref ZV5 Sec 2.8.2

3 Idle Channel Noise

at 2-Wire

at VX

4 Transmit Gain (2-Wire to Vx)

Nc

-84

-75

-70

-70

dBmp
dBmp

-1.4 -0.4 0.9 dB

Test circuit as Fig 5
Input 0.5V @ 1kHz
Off-Hook

5 Frequency Gain

(relative to gain @ 1kHz)

†

AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡Typical figures are at 25°C with nominal +5V and are for design aid only.
Note 1: All of the above test conditions use a test source impedance which matches the device’s impedance.

-1.6

-1.2

-1.3

-0.5

-0.4
0

dB
dB

300Hz
3400Hz

2-21

MH88422 Preliminary Information

+5V

DUT

ILoop

TIP

RLS

IC

TF

TXIN

RING

NC

26

24

22

20

470nF

18

16

14

1uF

11

13

1

3

5

7

9

VDD

AGND

LC/

RVLC/

IC

VX

VR

+5v

1uF

11

13

1

3

5

9

9

VDD

AGND

LC/
RVLC/

NC

VX

VR

Figure 4 - Test Circuit 1

-V

DUT

TIP

RLS

TF

TXIN

RING

26

24

22

IC

20

470nF

20

16

14

IC

10H 500

I=20mA

10H 500

Ω

100uF

+

Vs

Impedance = Zin

100uF

+

Ω

Gain = 20 * Log (VX / Vs)

2-22

V

Figure 5 - Test Circuit 2

Preliminary Information MH88422

-V

Ω

10H 500

I=20mA

10H 500Ω

100uF

+

V

100uF

+

(Zin)

Zin

Gain = 20 * Log (V(Zin) / Vs)

Vs

+5v

1uF

11

13

1

3

5
7

9

DUT

VDD

AGND

LC/
RVLC/

NC

VX

VR

TIP

RLS

IC

TF

TXIN

RING

NC

26

24

22

20

18

16

14

Figure 6 - Test Circuit 3

470nF

+5v

1

3

5
7

9

11

1uF

13

Return Loss = 20 x Log (V1 / Vs)

VDD

AGND

LC/
RVLC/

IC

VX

VR

DUT

TIP

RLS

TF

TXIN

RING

-V
10H 500

I=20mA

26

24

22

IC

20

470nF

18

16

14

IC

Ω

10H 500Ω

100uF

+

100uF

+

Zin

300Ω

V1

Vs

300Ω

Figure 7 - Test Circuit 4

2-23

MH88422 Preliminary Information

-V

+5v

1

VDD

3

AGND

5

LC/

7

RVLC/

9

IC

11

VX

1uF

13

VR

Long. to Met. Balance = 20 * Log (V1 / Vs)

Figure 8 - Test Circuit 5

DUT

TIP

RLS

TF

TXIN

RING

10H 500Ω

26

24

22

IC

20

18

16

14

IC

I=20mA

470nF

10H 500Ω

100uF

100uF

+

300

Ω

V1

300Ω

+

Vs

+5v

1

VDD

3

AGND

5

LC/

7

RVLC/

9

IC

11

VX

1uF

13

VR

Met. to Long. Balance = 20 * Log (V1 / Vs)

-V

DUT

26

TIP

24

RLS

22

IC

20

TF

470nF

18

TXIN

16

RING

14

IC

Figure 9 - Test Circuit 6

10H 500Ω

I=20mA

10H 500

100uF

100uF

Ω

+

300Ω

300Ω

+

510Ω

Vs

V1

2-24

Preliminary Information MH88422

0.19 Max (4.8 Max)

0.27 Max
(6.9 Max)

0.063 Max

(1.6 Max)

0.26

+0.015

(6.6+0.4)

0.90 Typ

(22.9 Typ)

0.95 Max

(24.2 Max)

Notes:

1) Not to scale

2) Dimensions in inches.
(Dimensions in millimetres)

3) Pin tolerances are non-accumulative.

4) Recommended soldering conditions:
Wave soldering - Max temp at pins 260˚C for 10 secs.
* Dimensions to centre of pin.

5) Short-cropped pins differ between variants.
(see pin description) 1 & BD-1 variant short.

*

0.08 Typ (2 Typ)
*

+0.01

0.20

(5.08+0.25)

0.020 + 0.005
(0.5

+ 0.12)

1

1.42 Max

(36.1 Max)

*

0.10 Typ

(2.54 Typ)

Figure 10 - Mechanical Data for 26-Pin DIL Hybrid

2-25

http://www.mitelsemi.com

World Headquarters - Canada

Tel: [phone]

Fax: [phone]

North America Asia/Pacific Europe, Middle East,

Tel: [phone] Tel: [phone] and Africa (EMEA)

Fax: [phone] Fax: [phone] Tel: [phone]

Fax: [phone]

Information relating to products and services furnished herein by Mitel Corporation or its subsidiaries (collectively “Mitel”) is believed to be reliable. However, Mitel assumes no
liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of
patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or
service conveys any license, either express or implied, under patents or other intellectual property rights owned by Mitel or licensed from third parties by Mitel, whatsoever.
Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Mitel, or non-Mitel furnished goods or services may infringe patents or
other intellectual property rights owned by Mitel.

This publication is issued to provide information only and (unless agreed by Mitel in writing) may not be used, applied or reproduced for any purpose nor form part of any order or
contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this
publication are subject to change by Mitel without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or
service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific
piece of equipment. It is the user’s responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or
data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in
any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to Mitel’s
conditions of sale which are available on request.

M Mitel (design) and ST-BUS are registered trademarks of MITEL Cor poration
Mitel Semiconductor is an ISO 9001 Registered Company
Copyright 1999 MITEL Corporation
All Rights Reserved
Printed in CANADA

TECHNICAL DOCUMENTATION - NOT FOR RESALE