 The MT2021 is a part of the range of pocket size testers specifically designed aiding the installation, commissioning and fault finding on high speed circuits.
The product incorporates many features that allow a user to quickly identify operational problems.
o Speed up to 2.048Mb
o Clock Frequency measurement
o BERT (PRP15) generator / checker
o Internal and External Timing options
o Clock Phasing error detection
o Data inversion detection
o LCD display frequency / error counts
o Battery powered -typically 16 hours
o Socket for external power feed
When
plugged into an X21 interface the unit can measure the clock frequency
to an accuracy of 0.5KHz up to a frequency of 2048KHz. For systems where an external
clock is required, the MT2021 can provide a selection of clock speeds.
The
unit incorporates a standard PRP15 test pattern generator and checker
and is down line compatible with the MT2048 G.703/G.704 diagnostic
test set. In this mode the unit can detect and display transmission
errors but also it is capable of identifying wiring and system problems.
Phasing errors due to the inversion of the clock signals with respect
to the data are identified by the MT2021 as is the receipt of an
inverted PRP15 test pattern.
To aid in identifying transmission problems,
the MT2021 can be set to transmit either continuous 1 or 0 data bits.
Input impedance can be set either to high impedance (Hi-Z) or standard
termination impedance of 110?.
The Hi-Z mode allows the MT2021 to be used in monitoring mode.
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| |
| Pins |
In/Out |
Signal |
| 2 |
9 |
Þ |
Transmit data |
| 4 |
11 |
Ü |
Receive data |
| 6 |
13 |
Ü |
Clock IN (DCE) |
| 3 |
10 |
Þ |
Control |
| 5 |
12 |
Ü |
Indicate |
| 7 |
14 |
Þ |
Clock- Out (DTE) |
| 8 |
8 |
Û |
Signal Ground |
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Switches
Power: Off/On
Input: Hi-Z or 110?
Control: Sets condition of pins 3-10 to either an On
or Off condition
Transmit:Continuous 1s or 0s
PRP15 test pattern-inverted as per ITU recommendation for 2.048Mb PCM systems
PRP15 ( 215-1 )
Inject Errors: Single errors /2 errors per sec
Error Count / Reset / Clock Speed: Sets the display options for the LCD
display Reset also resets the lost synch indicator
Set Speed: Selects
the appropriate clock speed to be output by the tester
Speeds(kbps): 64,
128, 256, 512, 1024 and 2048
DCE/Tester: sets the clock source to be used
Kbps / n?64k: allows measured
frequency to be divided by 64K to get channel multiple
LEDs
Lo Battery(flashing): ? 30 mins power remaining
Ind: displays the status of the
indicate signal ( pins 5 12 ), Red = Off, Green = ON
Data: Red-1, Green-0
PRP sync: Green-OK, Red inverted data
Lost: indicates a loss of synchronisation
has occurred during a test cycle-which may result in large error bursts.
DCE: indicates status of clock signals
Green Clock phasing correct
Red Clock phasing out of tolerance / inverted
LCD Display
Inactive display shows a - sign
BERT test running: alternating - and : signs
Overflow indicated by flashing
most sig. 1
Error Display range 0000 to 9999
Frequency display range: 1kHz 2048kHz
(accuracy: 0.5kHz)
Physical
Size: 65x120x22mm (excluding connectors)
Weight: 140g (5oz) approx (including
batteries)
Case: ABS to UL-94H
Connector: Keyed / locking IDC 15 way D type plug
Cable: Ribbon-approx 150mm
Power
Source: 2 x AA cells (MnAlk recommended)
Life: typically 16 hours |
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