Tmew2 - Siemens HiPath 3000 Service Manual

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Boards for HiPath 3000
Peripheral Boards
3.3.33

TMEW2

Introduction
The TMEW2 board (Trunk Module for E&M World) provides four analog tie trunk circuits for
E&M signaling for HiPath 3800. Each tie trunk circuit has eight connectors: incoming speech
path (2), outgoing speech path (2), incoming signaling (2) and outgoing signaling (2). This al-
lows tie trunk traffic to other private communication systems.
The peripheral board slots on the HiPath 3800 are fitted with SIPAC 9 SU connec-
>
tors. Since the TMEW2 board has SIVAPAC connector strips, you will have to install
a SIVAPAC-SIPAC board adapter in order to be able to use it in HiPath 3800.
For information on upgrade procedures, please see Section 4.2.5.4.
Speech paths
The speech paths can be set to four-wire or two-wire mode. Four-wire connections should be
used for high transmission quality on analog networks (this description deals only with four-wire
mode).
The advantage of separate speech paths for the incoming and outgoing directions is that the
stability (echo) of a connection is not adversely affected. In addition, repeaters in the transmis-
sion equipment compensate for attenuation loss on the line.
E&M signaling paths
The E&M signaling paths carry the signals that control connection setup and cleardown. Vari-
ous interfaces can be selected, depending on the requirements of the remote system or trans-
mission equipment. These interface types have different numbers of wires and different poten-
tials.
Starting up a tie trunk
Before you can start up a tie trunk, you must determine the type of interface supported by the
two systems. Type 2 is preferable because it virtually excludes problems with longitudinal volt-
ages.
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P31003-H3550-S403-4-7620, 02/05
HiPath 3000 V5.0, HiPath 5000 V5.0, Service Manual