Figure 4-2
The position of the ESN (1)
l
If there is no label on the FAN unit of the BBU, the ESN is printed on the mounting ears
of the BBU.
shows the position of the ESN.
Figure 4-3
The position of the ESN (2)
4.1.2 Boards and Module of the BBU3900
This describes the boards and module of the BBU3900 in terms of their configuration principles,
functions, ports, LEDs, and DIP switches.
GTMU
The GSM Transmission & Timing & Management Unit for BBU (GTMU) is the basic
transmission and control function entity of the BBU. It provides the reference clock, maintenance
port, and external alarm collection port, monitors the power supply, and controls and manages
the entire base station.
Panel
The GTMU is classified into two types: GTMU and GTMUb.
show
the panels of the GTMU and GTMUb.
4 BTS3900 Components
BTS3900
Hardware Description
4-4
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Issue 04 (2011-02-15)