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- Speed 2.048Mb - G703 Interface
- Network Loop functions
- BERT (PRP15) generator/checker
- Master and Slave Timing options
- Adjustable Sensitivity: 0 to -12 or -43dB
- BPV detection / counter
- 75 or 120ohm matching options
- Battery powered -typically 8 hours
Product Description
The ET2148 is a sophisticated handheld tester which is capable of identifying
a wide variety of circuit conditions yet is extremely easy to use.
Its main function is test the integrity of links by the transmission and
reception of a specific test pattern. The tester checks the incoming data
for errors, the total number of errors detected being shown on the LCD
display.
In order to facilitate this checking procedure, the tester can invoke
and release loopbacks in both local and remote equipment capable of responding
to the defined data sequences.
G.703 line Bit Error Rate Test (BERT)
This tests circuits with an unframed data pattern. The test may be run
either end-to-end using a pair of testers or with a remote loop using
a single tester. When set to BERT mode, the tester initially transmits
continuous HDB3 zeros until a valid incoming carrier is detected.The ET2148
then generates the standard unframed PRP15 test pattern (inverted 215-1
pseudo-random bit sequence), and can inject on command either single bit
errors or steady streams of errors at a rate of about E-6 (2 errors per
second). It will then check the received signals for the presence of the
PRP15 pattern. A green LED indicates synchronisation while red flashes
indicate bit errors.
The user can select either Master or Slave timing options allowing the
tester to operate in a wide range of network configurations.
Other data patterns can be generated to aid further testing. These include
the transmission of all 1s, all 0s and alternating 1s and 0s.
Network loopbacks
To invoke a loopback, the tester sends a ‘00001’ pattern repeatedly
for 8 seconds.
To release a loopback, the tester sends a ‘001’ pattern repeatedly
for 8 seconds.
Line status
The line is checked for HDB3 signals. A valid HDB3 line signal is shown
as green while red indicates no HDB3 signals. Line errors (bipolar violation
errors or BPVs) are indicated by red flashes.
When the PRP15 test pattern is not selected, the LCD display will automatically
count and log the number of BPV errors received.
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pricing and further details
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Specifications
Switches
Power On/Off
Sensitivity -12dB / -43dB
Matching 120? / 75?
Master/Slave Master: ET2148 originates timing.
Slave: ET2148 synchronises the output to the clock recovered from the
received signals.
Pattern select Press to select sequentially
all 0s, all 1s, alternate 0s/1s or PRP15.
Inject error(s) Injects bit or BPV errors according to mode selected.
Press once to inject a single error, or hold to inject 2 errors/second
and press to clear.
Loop Up/Down Press and hold to send Loop up and Loop down pattern sequences.
Reset Resets displayed error counts.
LEDs
Low battery ? 30 mins power remaining.
M / S Master / Slave clocking mode.
0 / alt / 1 Shows test pattern selected:
all 0s / both = alternating / all 1s.
PRP15 Shows PRP15 test pattern is being sent. Flashes off when errors
are sent.
U / D U flashing: Loop up is being sent.
U steady: Looped at distant end.
D flashing: Loop down is being sent.
Line status Green: valid HDB3 signals detected.
Red: no valid HDB3 signals detected.
Yellow flash: BPV errors detected.
0 / 1 Shows received 0s or 1s.
A0s Fewer than three 1s seen in 2048 bits.
AIS Fewer than three 0s seen in 2048 bits.
PRP15 sync/error
Green: error-free test pattern received.
Red flashes: test pattern errors.
Line
Matching 75? or 120?
Return loss >15dB (51kHz to 3.072MHz)
Dynamic range 0 to -12db or 0 to -43dB
Isolation typically 3kV transmit to receive
Transmit pulse amplitude and masks to G.703
Physical
Size 65?120?22mm (excluding connectors)
Weight 140g (5oz) approx (including batteries)
Case ABS to UL-94HB
Power
Source 2 ? AA cells (MnAlk recommended)
Life: typically 8 hours.
5V dc from lump plug (tip positive)
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