DIP
Switch
DIP Status
Description
1
2
3
4
ON
ON
ON
ON
The E1
impedance is
set to 75
ohms.
Other settings of the DIP bits
Disabled
3.2.8 USCU
This section describes the Universal Satellite card and Clock Unit (USCU).
Panel
There are two types of USCU: USCUb1 and USCUb2, as shown in
and
.
Figure 3-21
Panel of the USCUb1 (0.5 U)
Figure 3-22
Panel of the USCUb2 (1 U)
(1) GPS port
(2) RGPS port
(3) TOD port
(4) M-1PPS port
(5) BITS port
Functions
The USCU has the following functions:
l
The USCU provides interface for an external RGPS device (such as a reused device of the
operator), Metro1000 device, BITS device, and TOD input.
BBU3900
Hardware Description
3 BBU3900 Equipment
Issue 11 (2010-11-10)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
3-23
Содержание BBU3900
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