ABB FOX61 Series User Manual
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Contents
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F U N C T I O N A L D E S C R I P T I O N20 FOX61xLEDE1The V5 uplink modes are application specific modes used together withthe V5 protocol converter unit COSI1. V5.x applications terminate theP12 signal and use all 5 Sa bits.With V5.1 the Sa bits are fixed. With V5.2 Sa7 is used for the link identifi-cation control.For terminated signals the following functions are available:• CAS (PCM30, PCM30C)Support of channel associated signalling in time slot 16.• CRC4 (PCM30C, PCM31C, V5 Uplink)Generation and evaluation of the CRC4 code in time slot 0.5.1.2 Transparent transport modesA E1 port of the LEDE1 unit can be configured to one of the following trans-parent transport modes:• Transparent:Transparent for clock and data.The P12 signal has an unknown structure.Cross connection and protection switching is established on the P12(2 Mbit/s) traffic signal layer.Please note:The Transparent mode features clock transparent cross connections. Thatmeans that the signal is in a plesiochronous phase relationship with the NEtiming source.• Clock Master:Transparent for data.Unlike the Transparent mode, a clock master traffic signal is only crossconnected transparently in terms of its structure. The P12 output signal isalways resynchronised by the NE timing source. The input signal must besynchronous to the output signal in order to avoid bit slips.For details of the clock master mode, please refer to "1KHW002467FOX61x TDM Services". |
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