Ltc; Fig. 4.2-10 Operating Principles Of Ltc - Zte ZXDSL 9210 (V3.1) Technical Manual

ZXDSL 9210 (V3.1) Broadband Universal Access Equipment Technical Manual

4.2.8 LTC

4.2.8.1 Functions of LTC
The LTC provides the following functions:
1.
2.
3.
4.
4.2.8.2 Operating Principles of LTC
The operating principles of the LTC board are shown in Fig. 4.2-10.
Control interface of
4.2.8.3 LTC Interfaces
There are two test cascading interfaces which are RJ45 interfaces on the panel of the
LTC. The two interfaces are used to implement NE cascading, and forward cascading
data when multiple NEs share one tester. The silkprints of the interfaces are "UPLINK"
and "DNLINK".
There are another two RJ45 interfaces with silkprints "ETH-A" and "ETH-B" on the
panel of the LTC, but they are not in use in this version.
It communicates with the SCBF by means of the backplane, to obtain
configurations and commands for protection and test functions.
The test bus leading out of the test splitter board is connected via a backplane
with the LTC, and with a tester via the RJ45 interface (silkprinted as T1) on the
backplane to implement line test functions.
All guard lines led out from the test splitter board are converged to the LTC by
means of the backplane. The LTC is then connected to the splitter boards on the
backup protection boards, to implement the line protection.
The LTC provides 3.3 V power supply for each test splitter board in a
centralized way.
Test bus (odd)
Test bus (even)
splitter board

Fig. 4.2-10 Operating Principles of LTC

LTC board
Logic control circuit
4-20
Test line interface
Control command interface
(connected with the SCBF)