Installation PTN-4-2/4WEM
5
Release 01 02/2018
1.
INTRODUCTION
1.1
General
This document is valid as of Dragon PTN Release 3.0DR.
This document describes the 4-2/4WEM interface module (=IFM) which can be used to
interconnect leased line modems, PABXs... via the Dragon PTN Network. This module
provides 4 RJ45 ports to transport analogue voice signals between 300 - 3400Hz with a
maximum level of 5dBm. These ports are balanced voice ports with an impedance of 600Ω.
The used transportation mode is point-to-point 4-Wire voice (2-Wire = future support).
Besides the analogue voice interface, each port also provides an E&M interface (=future
support). E&M (=Ear and Mouth) is a signaling mechanism between telephone switches.
This IFM can be used in any IFM slot of any node. An IFM slot overview can be found in Ref.
[3] in Table 1.
This IFM converts the analogue voice from a voice link into MPLS-TP packets over the Dragon
PTN network, and vice versa. The destination IFM must also compensate for possible jitter
and network delays to keep everything synchronized. A packetized TDM service is called a
Circuit Emulation Service (=CES). A maximum of 4 CESs (1 per port) can be configured per 4-
2/4WEM IFM.
The main supported features are:
Packetizing of analogue voice;
Balanced voice ports, 600Ω impedance; Sample rate 8Khz;
Services
CESoPSN (=CES over Packet Switched Network)
2W/4W Voice;
Hitless Switching / Single Path ;
A general 4Wire Voice example can be found in the figure below:
Figure 1
General 4Wire Voice Example
MPLS-TP Dragon PTN Network
WAN (via SFP on fiber)
4-2/4WEM
Module
Dragon PTN
Node
LAN1
Packetized Voice via
CESoPSN
Voice
Links
Voice
Links
LAN2
Leased Line
Modem
PABX
