Installation, Operation & Diagnostics
for the
MIU202T
Industrial Grade, Bell 202T
Standalone Modem
Document No. 49-0002-011 Rev. B
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TABLE OF CONTENTS
1. STANDARDS.............................................................................................. 2
2. PRODUCT OVERVIEW........................................................................... 3
3. GENERAL PRODUCT SPECIFICATIONS............................................ 4
4. MODEM SPECIFICATIONS ................................................................... 5
5. ANALOG LINE SPECIFICATIONS ........................................................ 7
6. ANALOG MICROWAVE INTERFACE.................................................. 8
7. POWER CONNECTIONS........................................................................ 10
8. SERIAL DATA PORT PIN-OUT ............................................................ 11
9. DIP SWITCH FUNCTIONS..................................................................... 12
10. MODEM CONFIGURATION ................................................................. 14
11. LED INDICATOR..................................................................................... 15
12. OUTLINE DRAWING & MOUNTING.................................................. 16
13. DIAGNOSTICS ......................................................................................... 17
MIU202T Installation, Operation & Diagnostics Edition: December 28, 2000 Page 1
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1. STANDARDS
Meets FCC Rules Part J, Subpart 15, Class A for radiated emissions.
2.
PRODUCT OVERVIEW
The MIU202T is an industrial grade Bell202T modem for connection to
unconditioned and conditioned, voice grade, type 3002 two or four-wire
leased lines and metallic lines (eg; pilot wires). It can be powered from a
wide range of AC and DC power supplies, it is internally surge protected
on both the power and analog lines, and it will operate in temperatures
from -40 to +85 deg C.
Internally, the MIU202T consists of a baseboard and a communication
module. The baseboard includes the power supply regulation and surge
protection. The communication module is a Telenetics™ Pony
Express™ PE202T Modem Module.
The MIU202T is packaged specifically for the harsh environments found
in utility substations and industrial facilities. Though functionally similar
to commercial modems, the MIU202T includes special features that make
it particularly well suited for utility and industrial applications:
Environment:
The MIU202T has been designed specifically for use
in harsh environments. In addition to an extended
temperature range (-40 to +85º C), the MIU202T
includes surge, shock, vibration, and safety features
superior to those of conventional commercial
modems.
Power Supply:
Industrial:
The MIU202T can be powered from a broad range of
AC and DC power supplies, such as an auxiliary
supply (eg; 12VDC) from another piece of
equipment, 125VDC from a station battery or a
standard 120VAC.
The MIU is packaged in a rugged, compact, non-
metallic (ABS) enclosure. Designed for unmanned
locations, the MIUs do not include the array of
pushbuttons and LEDs normally associated with
consumer-type modems. Configuration is by dip
switches. Standard industrial connectors for data,
analog and power interfaces allow reliable
interconnection to other industrial components.
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3. GENERAL PRODUCT SPECIFICATIONS
Dimensions:
Weight:
5.3 x 4.0 x 1.375 inches
1 lb
Voltage Supply: Standard Model:
LV Model (Suffix “-LV”):
Current Requirements:
40 to 270VDC
40 to 270VAC, 50/60Hz
9 to 36VDC
12VDC
65mA
24VDC
27mA
125VDC
7.5mA
120VAC
6.5mA
220VAC
5.5mA
Surge Protection:
Power Supply: 8kVrms
Analog Line:
Digital Line:
3.75kVac
ESD ± 10kV
Operating Temperature:
Operating Humidity:
Storage Temperature:
-40 to +85 deg C
0 to 90% (non-condensing.)
-55 to 100 deg C
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4. MODEM SPECIFICATIONS
Modulation:
Modulation Type:
Bell202T
FSK
Synch/Async:
Asynchronous Only
0 – 1200bps
Data Rate:
Transmit Frequency:
Mark: 1200Hz
Space: 2200Hz
Error Correction:
Data Compression:
None
None
Data Modulation Connectivity:
Using 16ms Polling Test
99.999% or better at -37dBm
99.5% or better at -40dBm
95% or better at -43dBm
Serial Formats and Flow Control:
Asynchronous and RTS/CTS flow control
Analog Interface
Tx Output Level:
Rx Sensitivity:
-0 dBm or -10 dBm *
-43dBm or -33dBm *
-43dBm for constant carrier
-40dBm for polling carrier
Dip Switch Selectable *
600 ohms balanced
Line Termination:
Line Impedance:
2 or 4 Wire Configuration:
Dip Switch Selectable *
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Other Features
Receiver Equalization:
Self Test Diagnostics:
Local Analog Loopback:
Local Digital Loopback:
Remote Analog Loopback
Remote Digital Loopback
Anti-Streaming:
Compromise Equalization
None
See Section 13
See Section 13
See Section 13
See Section 13
OFF or 45 Seconds (+ 5 sec) *
1ms, 12ms, 35ms or 50ms (+5%) *
Note: Soft Carrier will effect
RTS/CTS delay time (see Dip
Switch Settings ~ Section 8)
Switch Selectable ON or OFF
20ms of 900Hz after RTS is turned
Off
RTS/CTS delay:
Constant Carrier
Soft Carrier Turn Off
Carrier Turn ON/OFF
8ms +0.5ms
* Dip Switch Selectable ~ See Section 9
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5. ANALOG LINE SPECIFICATIONS
The MIU202T contains analog circuitry for connection to the public
conditioned or unconditioned, Bell type 3002, 2 or 4-wire, full duplex voice
grade leased lines or metallic lines (eg; pilot wires). The MIU202T will
also interface to Power Line Carrier or Microwave radio voice channel
networks.
The MIU202T has an RJ-11terminated connector. The following lists the
MIU202T analog interfaces
Analog Line Type:
Conditioned or unconditioned, Bell type 3002, 2 or 4-wire, full duplex
voice grade or metallic lines or better.
Analog Line Specifications:
Bandwidth
Impedance
Frequency Response
Receiver Input Level
Output Level
300 Hz to 3400 Hz (±3dB)
600 / 900 ohms , balanced
400 to 3000Hz (±2dB)
-16dBm max.
+7 dBm
Noise Signal Level
-48 dBmO
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6. ANALOG MICROWAVE INTERFACE
The MIU202Tis designed to interface to a Microwave radio voice channel
network with the following specifications:
Phase Jitter (10 to 300Hz)1 degree peak-to-peak, max.
Frequency Response:
300 - 3400Hz -3, +0.7 dB
400 - 3000Hz -1, +0.7 dB
600 - 2400Hz + 0.7 dB
Frequency Stability:
With Synchronization
0.1 Hz
Without Synchronization 0.5 Hz / month
Level Stability (w/o regulation): + 0.5 dB (6 months)
Harmonic Distortion:
Absolute Delay:
1% max, 0.3 % typical
(1Khz, 0 dBmO test tone)
Option – 001:
Option – 002:
1500 µsec, maximum
1900 µsec, maximum
Group Delay (option - 001): 600 - 3200 Hz 1200 µsec, maximum
800 - 2800 Hz 550 µsec, maximum
1000-2600 Hz 350 µsec, maximum
Group Delay (option - 002): 600 - 3200 Hz with 1000 µsec, maximum
800 - 2800 Hz with 400 µsec, maximum
1000-2600 Hz with 180 µsec, maximum
Linearity:
Limiting:
0.3 dB +3.5 dBmO
+7.5dBmO, max (+6.5 dBmO typical)
for +20dBmO input
Crosstalk (intelligible)(1KhZ test tone at 0 dBmO):
Inter-channel
Intra-channel
65 dBmO maximum, 80 dBmO typical
70 dBmO maximum
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Crosstalk (unintelligible):
Adjacent channel
28dBrnc0 maximum (24 455B weighted
noise at 0 dBmO dBrnc0 typical).
28 dBrnc0, maximum (18 dBrnc0, typical)
(1KHz test tone at 0 dBmO)
Intra-channel
Out of Band Signalling:
Frequency 3825 Hz
Level -20 dBmO
Pulse speed (30 to 80% break) 8 to 14 pps
Pulse distortion +3 dB, level var. 3% max.
Signaling leak -60 dBmO, maximum
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7. POWER CONNECTIONS
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8. SERIAL DATA PORT PIN-OUTS
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9. DIP SWITCH FUNCTIONS
IMPORTANT NOTE: Invert modem to view dip switches as shown above
Table 1
Switch
Function
ON
OFF
Switch 1
Switch 2
Switch 3
Switch 4
Switch 5
Switch 6
Transmit Analog (TxA) Signal Level
Anti-Streaming
0 dBm
45 secs
-10 dBm
OFF
Received Analog (RxA) Signal Level -33 dBm
-43 dBm
RTS/CTS Delay
See Table 2
See Table 2
RTS/CTS Delay
Switched/Constant Carrier
Constant
Carrier
Switched
Carrier
(Follows
RTS State)
4-Wire
Switch 7
Switch 8
Switch 9
Switch 10
2 or 4- Wire Selection
Line Termination
Soft Carrier (900Hz) Turn Off
Spare
2-Wire
600 ohms None
ON
OFF
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Table 2: RTS/CTS Delay Time
Switched Constant Switch
Switch
5
Switch 9 RTS/CTS
2
4
Carrier Carrier
4
Soft
Carrier
OFF
Delay
Time
50 ms
Wire Wire
NO YES
YES NO
NO YES
YES NO
YES
YES
YES
YES
YES
NO
NO
NO
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
50 ms
50 ms
50 ms
NO YES
NO YES
YES NO
YES NO
YES
YES
YES
YES
YES
NO
NO
NO
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
ON
ON
35 ms
35 ms
35 ms
35 ms
OFF
NO YES
NO YES
YES NO
YES NO
YES
YES
YES
YES
YES
NO
NO
NO
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
ON
ON
12 ms
35 ms
12 ms
12 ms
OFF
NO YES
NO YES
NO YES
YES NO
YES NO
NO
YES
NO
NO
NO
NO
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
1 ms
12 ms
1 ms
1 ms
1 ms
YES
YES
YES
YES
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10. MODEM CONFIGURATION
The following table provides the Dip Switch settings required for most
modem application configurations:
Dip Switch Setting
1
2
3
4
5
6
7
8
9
4-Wire
Point-to-Point
4-Wire
ON
ON
ON
ON
ON
ON
ON
ON
Multi-Point
Master
4-Wire
Multi-Point
Slave
ON ON ON ON
ON
Rx Term. OFF
4-Wire
Multi-Point
Slave
Rx Term. ON
2-Wire
Point-to-Point
2-Wire
Multi-Point
Master
Line Term. ON
2-Wire
Multi-Point
Slave
Line Term. ON
2-Wire
Multi-Point
Slave
ON ON ON ON
ON ON ON ON
ON ON ON
ON ON
ON ON ON
ON ON ON
ON
ON
ON
ON ON ON
ON ON ON
ON ON ON
ON
ON
Line Term. OFF
For clarity, a blank space = OFF
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11. LED INDICATOR
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12. OUTLINE DRAWING & MOUNTING
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13. DIAGNOSTICS
The following pages provide hardware techniques for diagnosing
communication problems and thereby isolating the problem at the local
modem, the remote modem or the interconnecting line.
(a) LOCAL ANALOG LOOPBACK (Figure 2)
Requires a loop back cable with a built-in circuit for line loss to
simulate a typical leased line condition (See Figure 3).
Connect the loop back cable to the RJ11 connector on the modem
under test.
Set Dip Switches as follows…
Switch 7 = OFF
Switch 9 = ON
Switch 1 = ON
Switch 3 = ON
Switch 6 = OFF
Switch 4&5 = ON
4-Wire
Soft Carrier Turn Off Enabled
Transmit (TxA) Signal Level = 0dBm
Receive (RxA) Signal Level = –33dBm
Switched Carrier
RTS/CTS Delay = 50ms
Test 1: RTS/CTS Analog Control
Set RTS “ON” and check that CD (Carrier Detect) turns
“ON”.
Turn RTS “OFF” and ensure that CD turns “OFF”
With RTS “ON”, run a test message at TxD and verify that
the same message is received at RxD with no data errors.
Test 2: Transmit Signal Power & Receive Levels
Set Dip Switch 1 OFF (TxA = -10dBm)
CD will be OFF.
Change Dip Switch 1 to ON (TxA = 0dBm)
CD should now be ON.
Test 3: Received Signal Level
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Set Dip Switch 1 OFF (TxA = -10dBm) and Dip Switch 3
OFF (RxA = -43dBm).
CD will be ON.
Run a test message at TxD and verify that the same message
is received at RxD with no data errors.
Test 4: Repeat Test 3 for various RTS/CTS delay times and with
soft carrier ON and OFF.
(b) LOCAL DIGITAL LOOPBACK – 4/Wire Network (Figure 4)
On the modem under test, connect TxD to RxD
Switch 1 = ON (TxA = 0dBm)
Switch 3 = ON (RxA = -33dBm)
Switch 4 = OFF (RTS/CTS = 35ms)
Switch 5 = ON (RTS/CTS = 35ms)
Switch 6 = ON (Constant Carrier mode).
Switch 7 = OFF (4-Wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = ON (Soft Carrier = ON)
Transmit a test message from a remote modem and confirm that the
same message is received back at RxD on the remote modem with no
data errors.
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(c) REMOTE DIGITAL LOOPBACK – 4/Wire Network (Figure 5)
Configure both the local and remote modems as follows:
Switch 1 = ON (TxA = 0dBm)
Switch 3 = ON (RxA = -33dBm)
Switch 4 = OFF (RTS/CTS = 35ms)
Switch 5 = ON (RTS/CTS = 35ms)
Switch 6 = ON (Constant Carrier mode).
Switch 7 = OFF (4-Wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = ON (Soft Carrier Turn Off = ON)
Connect TxD to RxD at the remote modem.
Transmit a test message from the local modem and confirm that the
same message is received back at RxD on the local modem with no
data errors.
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(d) LINE DIAGNOSTICS
(i) Typical modem configuration for 4-wire Point-to-Point system…
Switch 1 = ON (TxA = 0dBm)
Switch 3 = ON (RxA = -33dBm)
Switch 4 = OFF (RTS/CTS = 1ms)
Switch 5 = OFF (RTS/CTS = 1ms)
Switch 6 = ON (Constant Carrier mode).
Switch 7 = OFF (4-Wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = OFF (Soft Carrier = OFF)
(ii) Typical modem configuration for 4-wire Multi-Point system…
Switch 1 = ON (TxA = 0dBm)
Switch 3 = ON (RxA = -33dBm)
Switch 4 = OFF (RTS/CTS = 1ms)
Switch 5 = OFF (RTS/CTS = 1ms)
Switch 6 = ON (Constant Carrier mode).
Switch 7 = OFF (4-Wire)
Switch 8 = ON (Line Termination = 600 ohms)
Switch 9 = OFF (Soft Carrier = OFF)
Adjustments…
In a network with high line loss (greater than 16dB) change Switch 3
(RxA) to OFF (-43dBm).
If there are conditions that can cause cross-talk (TxA leaking into RxA
path) set Switch 1 (TxA) to OFF (-10dBm).
Note that noise level should be –50dBm or lower for most FSK
operation (signal-to-noise ratio of 15dB or higher)
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Addendum: 202T built on 1224 printed circuit board.
Test Functions:
A momentary push button switch and two yellow LED’s are provided to
perform the test functions. When both LED’s are OFF, the modem is in
normal mode. Power ON reset insures the modem starts in normal mode.
1) Pressing the switch once causes the DL LED to turn ON and the modem
is in DIDITAL loopback.
2) Pressing the switch a second time illuminates both LED’s, and the modem
provides a SPACE frequency carrier.
3) Pressing the switch a third time turns on the AL LED, and the modem is
in Analog Loopback.
4) Pressing the switch one more time returns the modem to normal mode.
NOTES:
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