CHAPTER 2: PRODUCT DESCRIPTION
SPECIFICATIONS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
45
TELEPROTECTION
Input points:...........................................................16 per channel
Remote devices: ..................................................3
Default states on loss of
communications:...........................................On, Off, Latest/On, Latest/Off
Ring configuration: ............................................No
Data rate:................................................................64 or 128 kbps
CRC:...........................................................................32-bit
Inter-relay communications specifications
TYPICAL DISTANCE
RS422 interface: ..................................................1200 m (based on transmitter power; does not take into
consideration the clock source provided by the user)
G.703 interface: ...................................................100 m
850 nm laser (multimode) interface:..........2.0 km (50/125
μ
m cable with ST connector);
2.9 km (62.5/125
μ
m cable with ST connector)
NOTE
NOTE:
The typical distances shown are based on the assumptions for system loss shown below.
As actual losses vary from one installation to another, the distance covered by your system
may vary.
LINK LOSSES (850 NM LASER, MULTIMODE MODULE)
ST connector losses:..........................................2 dB (total of both ends)
50/125
μ
m fiber loss: ........................................2.5 dB/km
62.5/125
μ
m fiber loss: ....................................3.0 dB/km
Splice loss:..............................................................one splice every 2 km, at 0.05 dB loss per splice
System margin:....................................................3 dB of additional loss was added to calculations to
compensate for all other losses, including age and
temperature
LINK POWER BUDGET (850 NM LASER, MULTIMODE MODULE)
Maximum optical input power: ....................–9 dBm
Minimum transmit power: ..............................–22 dBm (into 50
μ
m fiber), –18 dBm (into 62.5
μ
m fiber)
Maximum receiver sensitivity: ......................–32 dBm
Power budget: ......................................................10 dBm (for 50
μ
m fiber), 14 dBm (for 62.5
μ
m fiber)
NOTE
NOTE:
These power budgets are calculated from the manufacturer’s worst-case transmitter
power and worst-case receiver sensitivity.
Test specifications
PRODUCTION TESTS
Thermal: ..................................................................products go through a 12 hour burn-in process at 60°C
