Crocus SHDSL G703.pdf - FTP Directory Listing
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Crocus SHDSL G703.pdf - FTP Directory Listing

Crocus SHDSL G703.pdf - FTP Directory Listing Crocus SHDSL G703.pdf - FTP Directory Listing

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84 Crocus SHDSL G703 Chapter 5 User manual Step-by-step configuration 5.5.2 Schematic overview of the different clocking modes for G703 type of interfaces One encoded signal As G703 interfaces are codirectional interfaces, they transport both data and clock in the same encoded signal. On this way they can transport clock information from a higher network level to a lower network level in the digital hierarchy. For this reason, the default configuration of G703 interfaces is external clock. G703 interfaces are typically used to give access to carrier backbones and to interconnect backbone equipment such as cross-connect switches (DXC), TDM multiplexers and PABXs in PDH infrastructures. In these networks, only one master clock is allowed to synchronize all devices at the E1 level (2.048 kbps). Crocus SHDSL TT vs. Crocus SHDSL CV On a Crocus table-top modem, the G703 interface can be configured for internal or external clock operation. A card version modem also supports the use of a station clock that can be applied via the backplane of the cardnest. When station clock is selected, also a backup clock can be provided in case the station clock is not present. Clock functionalities Depending on the type of equipment, the clock functionalities can differ: when multiple modems and multiple interfaces are available on the same device, there is a main difference in clock functionalities depending on the fact of a DXC feature is present or not. If no DXC is present, the clocking on all interfaces is independent and so we may have different clocking on each interface (Crocus SHDSL TWIN, 2300). In case a DXC is present only one clock is allowed for all interfaces (Crocus SHDSL QUAD DXC).

Crocus SHDSL G703 Chapter 5 85 User manual Step-by-step configuration Crocus SHDSL TT The figures below show the relationships between clock and data in the different configurations for the Crocus SHDSL TT: The figure below show the possible configurations in TMA:

<strong>Crocus</strong> <strong>SHDSL</strong> G703 Chapter 5 85<br />

User manual<br />

Step-by-step configuration<br />

<strong>Crocus</strong> <strong>SHDSL</strong> TT<br />

The figures below show the relationships between clock and data in the different configurations for the<br />

<strong>Crocus</strong> <strong>SHDSL</strong> TT:<br />

The figure below show the possible configurations in TMA:

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