BEIJING HUAHUAN ELECTRONICS Co., LTD.
H9MO-1641S User Guide V2.2
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The H9MO-1641S multiplexer is a compact design with 1U height, supplied with either DC±48V or
AC220V power supply, and suitable for inclusion in 19” racks. It is also suitable for desktop mounting
with 4 optional feet which can be supplied with this compact unit.
2
Equipment Networking Topology
The H9MO-1641S multiplexer can form ring, chain, point-to-point, and point-to-multipoint
transmission networks; or to form more complicated networks in conjunction with other H9MO
members. These paragraphs describe the modes and features to realise the various network
connections with this equipment.
2.1 Ring
network
Figure 2.1 Schematic diagram of a ring network formed by H9MO-1641S multiplexers.
A
B
Main Node
A
B
B
B
A
A
C
Figure 2.1 Ring network
All devices in figure 2.1 are of the relay type. The “A” and “B” marked on both sides of devices
represents respectively the ‘Optical Port A’ and ‘Optical Port B’ of the device, irrespective of actual
transmission direction. The connection lines between the devices are optical cables and the arrows
indicate signal directions. Please note the relations of transmission directions with the input and output
optical modules on “A” and “B” optical terminal boards, and they must be connected correctly. The
SNMP management system can be connected with device at any node.
The ring network formed by the equipment has a self-healing capability. In the case of fibre break at
any position during operation, the supervision system will automatically perform a switchover for the
multiplexing section, to restore normal communication between all nodes on the ring network quickly.