15
T1/E1 FIBEROPTIC LINE DRIVER
NOTE
The receiver saturates at about -20 dBm. In order to avoid saturation, set
the RANGE switch to the SHORT position whenever the power at the
receiver exceeds this level.
The receiver sensitivity at 850 nm is -38 dBm.
The receiver sensitivity at 1300 nm is -40 dBm.
Table 3-2. Internal Switches and Jumpers.
No. Microswitch/
Function
Possible Factory
Jumper
Settings
Setting
1
RANGE
Selects high (long-range) optical
LONG
SHORT
output or low (short-range) optical
SHORT
output.
2
INPUT
Enables connection of the INPUT
GROUNDED FLOATING
(Interface
BNC shield to Chassis Ground.
FLOATING
Grounding)
3
OUTPUT
Enables connection of the OUTPUT
GROUNDED FLOATING
(Interface
BNC shield to Chassis Ground.
FLOATING
Grounding).
4
INTERFACE
Selects the electrical interface.
100
Ω
T1 T1
100
Ω
DB15 155 V
DB15 or
120
Ω
E1
E1 120
Ω
DB15 220 V
DB15
75
Ω
E1 BNC
5
OPTICAL AIS XMT In event of optical signal loss, sends
ON-AIS signal OFF
all “ones” optical signalling at ±50 ppm
transmitted
to the remote unit (in addition to the
both electrically
all “ones” signalling sent to the local
(to local unit)
electrical interface).
and optically
(to remote unit).
OFF-AIS signal
transmitted
electrically only
(to local unit).
