MDS 05-3627A01, Rev. D
LEDR Series I/O Guide
123
You can perform an over-the-air BER test on the bench or in the field.
In this case, attach a separate piece of BER test equipment and feed it
into one or more of the T1/E1 ports. At the other end of the link, you use
another BER test box, or attach a loopback plug to the CPE data I/O
port. This tests the quality of the radio link itself with regard to the user
payload data. Such a bench, or over-the-air, test does not use the LEDR
bert
command.
NOTE:
It is important to avoid over-driving the receiver as it can be
damaged by strong signals. Signals stronger than -20 dBm
should be avoided to protect the receiver.
NOTE:
User BERT test equipment connected to a LEDR T1 data
interface my yield different BERT results than the radio’s
ber
command. This is likely when less than the channel's capacity
is utilized by the
configuration.
17.0 TECHNICAL REFERENCE
17.1 Specifications—
Models: LEDR 400S, 700S, 900S and 1400S
General
Frequency Ranges:
330–512 MHz (LEDR 400S)
746–794 MHz (LEDR 700S)
800–960 MHz (LEDR 900S)
1350–1535 MHz (LEDR 1400S)
RF Occupied Bandwidth:
25, 50, 100 and 200 kHz
User Data Rates:
64, 128, 256, 384, 512 & 768 kbps
With optional FT1 Interface Board:
n x 64 kbps (Where n = 12)
Permitted Data Throughput:
Channel Size
Data Rate
25 kHz
64 kbps
50 kHz
64 kbps to 128 kbps
100 kHz
64 kbps to 256 kbps
200 kHz
64 kbps to 768 kbps
Modulation Type:
32 QAM, 16 QAM, QPSK
Forward Error Correction (FEC):
Reed-Solomon
Acquisition Time— Typical:
From power up, 10 seconds
Voltage Range:
24 Vdc or 48 Vdc (±20%)
Power Consumption:
Less than 60 watts (non-protected configuration)
Temperature Range:
– 5° to 50° C
Humidity:
≤
90% non-condensing @ 40° C
Size:
1 RU; 19 Inch rack mount compatible
45 mm (1.75 in) high, 1RU
426 mm (16.75 in) wide (excluding rack brackets)
305 mm (12 in) deep
