How to design the PAN port of Huawei OLT equipment?

1. General in order to avoid the two upward mouth is connected to a single point of failure, this state data from walking on the piece of the board, if the down off, from another piece of the board, because so that we can minimize the damage of equipment (such as the single board failure) caused by accident, because the pon is generally used for operators, the Huawei OLT if off, affect the users and business all too clear.2. In series between the OLT?Refers to the OLT between redundant or a simple link to each other?OLT can be seen as a layer 3 switching device, but its core technology is the control of the ONU below, interconnection between two OLT operation routing protocol can achieve what you said series topology effect.ONU series of words can be used in a beam splitter, as shown in figure.After OLT downward a 1:2 splitter, spectral ratio of 5 goes, than small optical fiber spectroscopic ONU, spectral than big same optical splitter, optical fiber again by one such a layer, in this way of deployment support 6-7 ONU () under the same pon mouth, perhaps because more droop too big to run normally.