The Fobox; Interfaces Of The Fobox - Siemens SWT-3000 Equipment Manual

SWT 3000 Equipment Manual

The FOBox

The FOBox is used for connecting the SWT 3000 via optical fibre with a PDH- or SDH-Multiplexer.
For each transmission direction a separate fibre is necessary. The FO Box contains the FOM mod-
ule with the electrical/optical conversion, the interface to the multiplexer and a power supply. Fur-
ther details are described in chapter 1 of this manual.
An adaptor is installed for the conversion from the system connector to the alarm relay, the con-
nectors for the digital interface (X.21/G703.1/G703.6) and the power supply connector.
Tx - Alarm
Rx - Alarm
FO Connection
Figure 13:

Interfaces of the FOBox

The interfaces of the FOBox will be carried out by an adapter converting the pinning of the FOB
module to a 15-pin female Sub-D connector according the subsequent table.
Table 27:
DTE
Pin Function X.21
1 Shield
2 Transmit(a)
3 Control(a)
4 Receive(a)
5 n.c.
6 Signal Timing(a)
7 n.c.
8 Signal Ground
9 Transmit(b)
10 Control(b)
11 Receive(b)
12 n.c.
13 Signal Timing(b)
14 n.c.
15 n.c.
© SIEMENS AG 2008
Selection of the
digital Interface
X.21
G703.1
G703.6
The fibre optic box
Pinning of the Sub-D female connector X1
Name X.21 Name
G.703.1
GNDS Shield
TxD_A TX-
C(a)
RxD_A RX-
RxC_A
GND G
TxD_B TX+
C(b)
RxD_B RX+
RxC_B
Edition p3_3_2x 08/09
Installation and Commissioning
Power supply
20-72V DC
22-60V AC
Imax=0,6A
Alarm relay
Name Signal
G703.6 Direction
Shield ---
TX- OUT
OUT
RX- IN
IN
G ---
TX+ OUT
OUT
RX+ IN
IN
- 1
+
2
X4
1
2
X1
3
X2
FOB-X11
Pin
A1,A31,C1,
C31
A12
A10
A13
A11
A3
A8
A14
A9
A15
Page - 25