Technical Specifications Of The Ltop Overvoltage Protection Module - Siemens SINAUT ST7 System Manual

Introduction to the SINAUT ST7 system
1.6 LTOP overvoltage protection modules
Figure 1-14
The LTOP overvoltage protection module is available in two variants:
LTOP 1
Overvoltage protection module for use at the start or end of a 2-wire dedicated line.
LTOP2
Overvoltage protection module for use at the start or end of a 4-wire dedicated line or in a 2-
wire tapping point. In a 4-wire tapping point, two LTOP2 modules are required.
Table 1- 3
Short name
LTOP1
LTOP2
OPM
The two LTOP variants have both screw terminals and an RJ-12 Western jack. The WAN
cable (RJ-12 - RJ-12) supplied with the MD2 and MD3 modems (used as dedicated line
modems) can be connected directly to this RJ-12 jack.
Note
The LTOP modules are not suitable for protecting dial-up connections (telephone and ISDN
network). Companies such as Phoenix and Dehn offer TAE6, S0, RJ-12, and RJ-45 jacks
with overvoltage protection.
1.6.2

Technical specifications of the LTOP overvoltage protection module

LTOP
Transmission paths
Transmission ratio
48
LTOP2 overvoltage protection module
Overview of the LTOP modules
Order no.
6NH9821-0BC11
6NH9821-0BC12
6NH9821-0BB00
Private transmission lines with or without loading coils
1 : 1; ± 5 % (e.g. 600/600 ohms in the voice band)
Explanation
Single line transformer LTOP1, with one OPM
overvoltage protection module for use at the start or
end of a 2-wire dedicated line
Double line Transformer LTOP2, with two OPM
overvoltage protection modules for use at the start or
end of a 4-wire dedicated line or a 2-wire tapping
point
OPM overvoltage protection module for LTOP1 and
LTOP2, plug-in (pack of 4)
System Manual, 07/2009, C79000-G8976-C178-07
Station control system