CABLE SPECIFICATIONS
The physical characteristics of the media cable must meet or exceed IEEE 802.3
specifications.
Fiber Cable
Multimode Cable Recommended:
62.5 / 125 µm multimode fiber
Optional:
100 / 140 µm multimode fiber
85 / 125 µm multimode fiber
50 / 125 µm multimode fiber
Singlemode Cable Recommended:
9/125 µm singlemode fiber
Bit
error rate:
≤
10
-9
LE2127A-R3
850nm multimode - with ST connectors
Fiber-optic Transmitter Power:
min: -16.0 dBm
max: -10.0 dBm
Fiber-optic Receiver Sensitivity:
min: -29.5 dBm
max: -7.2 dBm
Typical Maximum Cable Distance*:
2 kilometers (6,600 feet)
LE2127A-R3(SC)
850nm multimode - with SC connector
Fiber-optic Transmitter Power:
min: -16.0 dBm
max: -10.0 dBm
Fiber-optic Receiver Sensitivity:
min: -29.5 dBm
max: -7.2 dBm
Typical Maximum Cable Distance*:
2 kilometers (6,600 feet)
LE2127A-R3(SM)
1300nm singlemode - with ST connectors
Fiber-optic Transmitter Power:
min: -27.0 dBm
max: -14.0 dBm
Fiber-optic Receiver Sensitivity:
min: -34.0 dBm
max: -14.0 dBm
Typical Maximum Cable Distance*:
20 kilometers (66,000 feet)
*Actual distance dependent upon physical characteristics of network installation.
AUI (DB-15) Interface
INSTALLATION
Set Switches
NOTE: UP enables the indicated function on
the 4-position switch located to the right of the
10BASE-FL connector and DOWN disables the
indicated function.
1
SQE Test: (UP) Enable SQE test
function when connecting to other devices. (DOWN) Disable SQE
test function when connecting to IEEE 802.3 compliant repeaters.
Default is enabled (UP).
2
LinkALERT: (UP) Enable the LinkALERT
™
function. (DOWN)
Enable standard Link Integrity Test. Default is enabled (UP).
3
Half-Duplex/Full-Duplex Mode: (UP) Enable half-duplex mode
when connecting to half-duplex network devices. (DOWN) Enable
full-duplex mode when connecting to full-duplex network devices.
Default is enabled (UP) NOTE: DO NOT USE FULL-DUPLEX
WHEN CONNECTING THE
TRANSCEIVER
TO A REPEATER.
4
Not Used
Install Cable
NOTE: See page 6 for cable specifications and configurations.
FIBER
•
Locate or build 10BASE-FL compliant fiber cable with male two-
stranded TX to RX connectors at both ends.
•
Connect male TX and RX cable connectors at one end of cable to
TX and RX female connectors, respectively, on media converter.
•
Connect female TX and RX cable connectors at other end of
cable to RX and TX connectors of 802.3 compliant fiber device.
AUI
DROP CABLE
•
Connect AUI drop cable female connector to male AUI (DTE)
connector on LE2127A-R3.
•
Connect other end of AUI drop cable to 10BASE-5 network.
NETWORK DEVICE
•
Connect device female connector to male AUI (DTE) connector
on LE2127A-R3.
Connect to Power
The LE2127A-R3 is powered through the AUI connection.
Parameter
Minimum
Typical
Maximum
Transmit
Transmit threshold voltage level:
-140mV
-170mV
-190mV
Transmit turn on delay:
100ns
Transmit steady propagation delay:
15ns
50ns
Transmit loop back start up delay:
500ns
Transmit turn off to data idle:
400ns
2100ns
SQE test delay:
0.6 µ sec
1.6 µ sec
SQE test duration:
0.5 µ sec
1.0 µ sec
1.5 µ sec
Receive
Receive turn on delay:
350ns
Receive steady propagation delay:
15ns
50ns
Differential output voltage (RX(-/+)):
(+/-)550mV
(+/-)1200
Differential output voltage (col(-/+)):
(+/-)550mV
(+-)1200
Differential output rise time (RX(-/+), col(-/+)): 4ns
Differential output fall time (RX(-/+), col(-/+)): 4ns
Collision
Time for SQE to deact. after collision:
450ns
700ns
Collision frequency:
8.5MHz
11.5MHz
Collision pulse duty cycle:
40%
50%
60%
SQE test delay:
0.6 µ sec
1.6 µ sec
Jabber activation delay:
20ms
70ms
150ms
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