MINI-LINKEandEMicro
3.11 ETU – Ethernet Interface Unit
The ETU enables transmission of Ethernet traffic over a MINI-LINK E hop or
network. A typical application of the ETU is LAN-to-LAN interconnection.
The ETU is an indoor plug-in unit that fits into any available AMM slot. It has
one Ether net interface, either for 10BASE-T or 100BASE-TX, for connection
to a LAN. Three G.703 interfaces – 2, 8 and 34 Mbit/s (E1, E2 and E3) – are
available for connection to an MMU or possibl y an SMU. The selected G.703
interface can work in combination with either 10BASE-T or 100BASE-TX,
providing selectable throughput capacity.
Ethernet traffic from the ETU can be combined with other traffic such as
PBX, connected directly to the MMU. When using 34+2 Mbit/s traffic capacity
for example, 34 Mbit/s can be used for Ethernet data and 2 Mbit/s for voice
transmission.
Ethernet LAN
ETU
RAU
Possible
MINI-LINK E
repeater or network
n x E1/E2
E1/E2/E3
PBX
MMU
or
SMU+MMU
EthernetLAN
ETU
n x E1/E2
E1/E2/E3
Auxiliary
Alarm
Auxiliary
Alarm
PBX
MMU
or
SMU+MMU
RAU
MINI-LINK
Netman
10BASE-T/
100BASE-TX
10BASE-T/
100BASE-TX
3610
Figure 51 ETU used for LAN-to-LAN interconnection in combination with
PBX traffic
3.11.1 Functional Description
The basic function of the ETU is to convert Ethernet traffic to a PDH data
stream with a chosen traffic rate and vice-versa.
69
AE/LZT 110 2012 R8C 2002- 03-04
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