HUAWEI NetEngine40E Universal ServiceRouter
Hardware Description
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
One end of the clock cable is an SMB/RJ45 connector connected to the clock interface
on the SRU/MPU and the other end is connected to the clock interface on an external
device. The connector on the other end needs to be prepared as required on site.
An SMB connector is used together with the 75-ohm coaxial cable whereas an RJ45
connector is used together with the 120-ohm trunk cable.
The wire sequence of a trunk cable used as a clock cable differs from the wire sequence of an ordinary
twisted cable.
7.6.2 Structure
75-ohm Clock Cable
Figure 7-3 shows the structure of the 75-ohm clock cable.
Figure 7-3 75-ohm clock cable
IF the device provides only the 75-ohm clock while you need the 120-ohm clock, use a transfer
cable shown in Figure 7-4 and Figure 7-5.Choose an one-channel or a two-channel transfer cable as
required.
The fixed length of the coaxial cable of the clock transfer cable is 200 mm ( 7.87 in. ) , which
ensures that the transfer connector is installed on or near the NE40E.
One-channel 75-ohm/120-ohm Clock Transfer Cable
Figure 7-4 shows the one-channel 75-ohm/120-ohm clock transfer cable.
Figure 7-4 One-channel 75-ohm/120-ohm clock transfer cable
1. Coaxial connector-SMB-75 ohm-straight/plug-female
3. 75-ohm/120-ohm transfer PCB
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