Installation, Operation & Diagnostics
for the
MIU202T
Industrial Grade, Bell 202T
Standalone Modem
Document No. 49-0002-011 Rev. A
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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: April 4, 1998
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1. STANDARDS
Meets FCC Rules Part J, Subpart 15, Class A for radiated emissions.
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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”):
40 to 270VDC
40 to 270VAC, 50/60Hz
9 to 36VDC
Current Requirements:
12VDC
65mA
24VDC
27mA
125VDC
7.5mA
120VAC
6.5mA
220VAC
5.5mA
Surge Protection:
Power Supply:
Analog Line:
Digital Line:
8kVrms
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:
Data Rate:
Asynchronous Only
0 – 1200bps
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)
RTS/CTS delay:
Constant Carrier
Switch Selectable ON or OFF
20ms of 900Hz after RTS is turned
Off
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 msec, maximum
1900 msec, maximum
Group Delay (option - 001):
600 - 3200 Hz 1200 msec, maximum
800 - 2800 Hz 550 msec, maximum
1000-2600 Hz 350 msec, maximum
Group Delay (option - 002):
600 - 3200 Hz with 1000 msec, maximum
800 - 2800 Hz with 400 msec, maximum
1000-2600 Hz with 180 msec, 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).
Intra-channel
28 dBrnc0, maximum (18 dBrnc0, typical)
(1KHz test tone at 0 dBmO)
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
-33 dBm
-10 dBm
OFF
Received Analog (RxA) Signal Level
RTS/CTS Delay
-43 dBm
See Table 2
See Table 2
Switched
RTS/CTS Delay
Switched/Constant Carrier
Constant
Carrier
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
ON
None
OFF
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Table 2: RTS/CTS Delay Time
Switche Constan Switch
2
4
Switch Switch 9 RTS/CTS
Wire Wire
d
Carrie
r
t
Carrie
r
4
5
Soft
Carrier
Delay
Time
NO
YES
NO
YES
NO
YES
NO
YES
YES
YES
YES
YES
NO
NO
NO
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
50 ms
50 ms
50 ms
50 ms
YES
OFF
NO
NO
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
NO
NO
NO
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
ON
ON
35 ms
55 ms
35 ms
35 ms
NO
OFF
NO
NO
YES
YES
YES
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
NO
OFF
NO
NO
NO
YES
YES
YES
YES
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
32 ms
1 ms
YES
YES
YES
YES
NO
1 ms
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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
Multi-Point
Master
ON
ON
ON
ON
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
MIU
14
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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 4-Wire
Switch 9 = ON
Switch 1 = ON
Switch 3 = ON
Soft Carrier Turn Off Enabled
Transmit (TxA) Signal Level = 0dBm
Receive (RxA) Signal Level = –33dBm
Switch 6 = OFF Switched Carrier
Switch 4&5 = ON
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.
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Test 3: Received Signal Level
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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NOTES:
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