ZXDSL 9210 (V3.1) Broadband Universal Access Equipment Technical Manual
4-8
1. The power distributor supports the input of two lines of –48 VDC. It outputs
three lines of –48 VDC at the output terminal to three busbar segments,
providing power supplies for two ZXDSL 9210 frames and one EPM monitoring
plug-in box.
2. Either type of cabinets can hold two layers of ZXDSL 9210 frames.
3. The fan monitoring board (FANJ) inside a fan monitors the radiator fan and
provides fan alarm functions. When the fan becomes faulty, the FANJ board
sends an alarm to the NM and the alarm box by means of the EPM monitoring
plug-in box.
4. The line tester works in conjunction with the LTC board and the active test
splitter board to test ADSL lines. Depending on the commands sent from the
SCBF, the LTC delivers a line capturing command to the splitter board capable
of line capturing. At the same time, it completes interactions with the line tester
to obtain test results and feed them back to the SCBF.
5. The EPM monitoring plug-in box is located near the cabinet bottom and used for
monitoring environment and power supply factors of the communication
equipment. It provides a range of test functions, such as primary power supply
monitoring, AC power test, secondary power supply monitoring, distribution
frame alarm, and environment parameters like temperature, humidity, flooding,
theft, and smog.
4.2 Introduction to Boards
4.2.1 SCBF
4.2.1.1 Functions of SCBF
The main functions of SCBF are as follows:
1. Layer 2 data switching: Data pass the Ethernet processor of the SCBF and is
switched according to the MAC address by the chip itself to a corresponding
G.Link port. The G.Link of the Ethernet processor connected with the G.Link
port sends data to a corresponding port;
