Alstom MiCOM P54 Series, Technical Manual, Page: 282 / 1024

P54x/EN OP/La4 Operation
(OP) 5-108
MiCOM P543, P544, P545 & P546
OP
The units are housed in a 20TE MiCOM case.
Fiber optic connections to the unit are made through BFOC/2.5 type connectors, more
commonly known as ‘ST’ connectors.
The optical characteristics are similar to the P54x 850 nm multi-mode fiber optic interface
(refer to optical budgets in chater
P54x/EN/AP
).
2.1.9 Multiplexer link with G.703 electrical interface using auxiliary optical fibers and type P591
interface
A P54x relay with 850 nm short haul optical interface is connected to a P591 unit by 850 nm
multi-mode optical fiber. Multi-mode fiber type 50/125

m or 62.5/125

m is suitable.
BFOC/2.5 type fiber optic connectors are used. The P591 unit converts the data between
optical fiber and ITU-T compatible G.703 co-directional electrical interface. The G.703
output must be connected to an ITU-T compatible G.703 co-directional channel on the
multiplexer.
P 59 1
P 54 0
85 0nm
P 54 0
85 0nm
O /F O /F
P 59 1
M
U
X
M
U
X
G 70 3
G 70 3
The P591 unit supports the ITU-T Recommendation G.703 co-directional interface.
The G.703 signals are isolated by pulse transformers to 1 kV.
Since the G.703 signals are only of ±1 V magnitude, the cable connecting the P591 unit and
the multiplexer must be properly screened against electromagnetic noise and interference.
The interface cable should consist of twisted pairs of 24 AWG, overall shielded, and have a
characteristic impedance of about 120

. It is generally recommended that the interface
cable shield should be connected to the multiplexer frame ground only. The choice of
grounding depends however on local codes and practices.
Electrical connections to the P591 unit are made via a standard 28-way Midos connector.
Please refer to Installation chapter for the external connection diagram.
The P54x must be set with Clock Source as ‘External’, refer to section 2.3.3.
2.1.10 Multiplexer link with V.35 electrical interface using auxiliary optical fibers and type P592
interface
A P54x relay with 850 nm short haul optical interface is connected to a P592 unit by 850nm
multi-mode optical fiber. Multi-mode fiber type 50/125

m or 62.5/125

m is suitable.
BFOC/2.5 type fiber optic connectors are used. The P592 unit converts the data between
optical fiber and ITU-T compatible V.35 electrical interface. The V.35 output must be
connected to an ITU-T compatible V.35 channel on the multiplexer.
P 592
P 54 0
85 0nm
P 54 0
85 0nm
O /F O /F
P 592
M
U
X
M
U
X
V35
V35
The P592 unit supports the ITU-T Recommendation V.35 interface.
Connections of V.35 signals to the P592 unit are made via a standard female 34 pin ‘M’
block connector. Since the V.35 signals are either of ±0.55 V or ±12 V magnitude, the cable
connecting the unit to the multiplexer must be properly screened against electromagnetic
noise and interference. The interface cable should consist of twisted pairs of wires which are
shielded, and have a characteristic impedance of about 100

. It is generally recommended
that the interface cable shield is connected to the multiplexer frame ground. The choice of
grounding depends however on local codes and practices.
The P592 front panel consists of five indicating LEDs and six DIL (dual in line) switches.