PDH E1 Fiber Optic Multiplexers

Application solution in Chinese market

1. Voice service
In the populated area, PDH multiplexers are used to provide voice service for long distance. This application was developed in 90’s when local phone and long distance phone service are more and more popular.

2. Wireless voice service
PDH optical multiplexer provides transport infrastructure for voice service of the cellular operator and wireless operator. This application was developed in late of 90’s when the cell phone is much more popular in China. In this

3. Voice service and leased line for data service Provides legacy voice service and data service with the leased line for the company. In the early of data service, DDN is applied in the all data service field. But with the development of customer requirements (such as bank, finance, school, enterprise and so on), bandwidth isn’t satisfied with the need. So PDH come to another high tide with substitution of legacy base modem to provide more bandwidth with fiber access for leased line data service.

The evolution of PDH
As Internet is booming, the legacy PDH optical multiplexer is developed to allow for connection of fast Ethernet as well as E1 lines operating independently one another. Thus up to 120 telephone calls can be transmitted simultaneously and optimum use can be made of the existing optical fiber. The fast Ethernet + 4E1 operates on LAN
side in the same way as a full duplex switch. The multiplexers can handle over length Ethernet frame (1522 Bytes) according to IEEE 802.1Q and supports VLAN tagging.

June 10, 2011

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