Ericsson MINI-LINK TN R3 ETSI Technical Description page 38

MINI-LINK TN R3 ETSI
100BASE-T
Figure 33
The bandwidth of each Ethernet bridge connection is nxE1 per inverse
multiplexer in the unit, where n≤48 for ETU2 (with a maximum of 96 E1s in
total), and n≤16 for NPU2 and ATU. NPU2, NPU3and ATU have one inverse
multiplexer while ETU2 has six.
Ethernet traffic is connected to the units using RJ-45 connectors with support
for shielded cable.
The Ethernet bridge connections have auto-negotiation 10/100 Mbit/s speed
and full/half duplex. Transparency to all kinds of traffic is supported, including
IEEE 802.1Q VLAN, MAC address based VLAN, VLAN tag ID based and
untagged frames, frames with up to 2 VLAN tags or frames with ICS tag.
The number of E1s in each connection is configured from the management
system. The traffic is distributed over the E1s by an inverse multiplexer. The
load sharing is seamless and independent of the Ethernet layer.
Figure 34 on page 33 shows the protocol layers involved in an Ethernet bridge
connection.
32
1 - 16xE1
ATU
AMM 6p
AMM 2p B
NPU3
AMM 2p
NPU2
ATU
AMM 6p
AMM 6p C
NPU3
AMM 2p
NPU2
Ethernet traffic in a MINI-LINK TN R3 network
ETU2
AMM 20p
ETU2
ETU2
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
Ethernet core
network
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