E1 Interfaces - Ericsson MINI-LINK TN R3 ETSI Technical Description

3.4

E1 Interfaces

This section describes the plug-in units providing short haul 120 Ω balanced E1
(G.703) interfaces. In a mobile access network these are typically used for traffic
connection to a radio base station or for connection to leased line networks.
3.4.1 NPU
NPU2 and NPU3 provides four E1 interfaces, NPU1 B provides eight E1
interfaces, see Section 3.3.1 on page 20.
3.4.2 LTU
3.4.2.1 Overview
The following LTUs with E1 interfaces are available:
LTU 16/1
LTU3 12/1
Figure 28
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
Fits in any AMM. The LTU 16/1 provides 16 additional E1 interfaces.
Fits in an AMM 2p (as LTU 12/1 Kit, incl. washer), AMM 2p B and
AMM 6p C or D. For sites where the eight E1 interfaces on the NPU3
are insufficient, the LTU3 12/1 provides 12 additional E1 interfaces.
4x(4xE1)
3x(4xE1)
LTUs with E1 interfaces
Basic Node
LTU 16/1
LTU3 12/1
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