M900/M1800 BTS3X Series Base Transceiver Station
Hardware Description Manual
3 Board
Issue 01 (2006-11-18)
Huawei Technologies Proprietary
3-53
Table 3-28
TDU ports
ID
Type
Meaning
Indication
CKB1 DB25
CKB2 DB25
Clock signal port of
combining cabinet
!
The functions of CKB1 and CKB2 are the
same.
!
CKB1 and CKB2 match both clock signal
combining cabinet cable and CKM-
matched connector.
!
The connectors are used in the following
cases:
a. The BTS is installed on both ends of the
clock bus.
b. The BTS is single cabinet configuration.
!
In combining cabinet configuration, if the
BTS serves as the primary cabinet, its
clock signals are led out from CKB1 and
CKB2; if the BTS serves as a secondary
cabinet, the clock signals are led in from
CKB1 and CKB2.
DCF1 DB37
DCF2 DB37
Data signal port of
combining cabinet
!
The functions of DCF1 and DCF2 are the
same.
!
DCF1 and DCF2 match both data
combining 3. The connectors are used in
the following cases:
a. The BTS is installed on both ends of the
clock bus.
b. The BTS is single cabinet configuration.
!
In combining cabinet configuration, if the
BTS serves as the primary cabinet, its
data signals are led out from DCF1 and
DCF2; if the BTS serves as a secondary
cabinet, the data signals are led in from
DCF1 and DCF2.
EAC1
DB37
For external extension alarm signals input.
It cannot be connected with environment
monitoring instrument.
EAC2 DB25
External alarm input
port
For external extension alarm signals input.
It can be connected with environment
monitoring instrument.
