boards.fm
P31003-H3560-S403-54-7620, 09/05
HiPath 3000 V6.0, HiPath 5000 V6.0, Provisional Service Manual
3-303
Boards for HiPath 3000
Peripheral Boards
3.3.35
TMEW2
Introduction
The TMEW2 board (
T
runk
M
odule for
E
&M
W
orld) 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.
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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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.