Lanex TM-78 Operating Manual
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Contents
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10Base-T/100Base-TX/E1 converterOperating Manual_______________________________________________________________________________IOA78-1C 15 January 20054.6. Clock setupThree variants of converter operation are possible. The converters may transmit data,depending on conditions and capacity of the telecommunication network, in the following layouts:• MASTER-MASTER• MASTER-SLAVE• SLAVE-SLAVEThe converter operates in MASTER mode when the clock source for data transmitted tothe E1/G.703 interface is the clock from internal quartz generator. In SLAVE mode, clock sourcefor data transmitted to the E1/G.703 interface is the clock retrieved from the opposite direction oftransmission.In MASTER-MASTER mode, both converters work with their own internal clocks –plesiochronous transmission. Possible work with PDH and SDH systems configured inasynchronous mode.In MASTER-SLAVE mode, the master works with internal clock and the slave works withretrieved clock – synchronous transmission. Possible work with PDH and SDH systemsconfigured in asynchronous mode.In SLAVE-SLAVE mode, both converters work with retrieved clocks – synchronoustransmission. This configuration is only possible if the converters are connected to SDHtelecommunication network and the network operates in synchronous mode. Work with PDHsystems is not possible.4.7. Configuration of the E1 G.703 interfaceThe converter has the following E1 G.703 interface configuration functions:• CRC option available only in framing mode ono switching this option on enables achieving proper integration with equipment thatrequires transmission of the remainder of CRC division in zero slot C1-C4 bitso switching this option off results in setting C bits of the zero slot in ‘1’ position• Framingo switching this option on enables proper integration with equipment operating withG.704 framed signal and allows selection of a block of slots for transmission. Inaddition, this option enables communication with the remote device on the side ofthe E1 interface.o option off results in blocked selection of slots, surveillance slot and CRC setting.When the framing option is off, E1 stream is transmitted transparently. Therefore,data can be transmitted at full speed of 2048 kbit/s.• Multiframeo Switching this option on enables proper integration with operating equipment thatuses the sixteenth slot for signals transmission.o In this option, the sixteenth slot may not be used for data transmission• Choice of surveillance slot number, to be used for managing the remote device connectedon the side of the E1 interface, option available only if framing is on. |
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