Basic Node
3.4 E1 Interfaces
This section describes the plug-in units providing short haul 120 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 Fits in any AMM. The LTU 16/1 provides 16 additional E1 interfaces.
LTU3 12/1 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.
LTU 16/1
LTU3 12/1
Power
Fault
TR:3A-3D
E1/DS1
E1/DS1
TR:2A-2D
TR:1A-1D
LTU3 12 1
E1/DS1
3x(4xE1)
9977
E1:1A-1D
E1:2A-2D
E1:3A-3D
E1:4A-4D
ERICSSON
LTU 16/1
Fault
Power
BR
4x(4xE1)
Figure 28 LTUs with E1 interfaces
25
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
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