Transparent Transport Modes - ABB FOX61 Series User Manual

F U N C T I O N A L D E S C R I P T I O N
5.1.2

Transparent transport modes

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The V5 uplink modes are application specific modes used together with
the V5 protocol converter unit COSI1. V5.x applications terminate the
P12 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.
A 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. That
means that the signal is in a plesiochronous phase relationship with the NE
timing source.
• Clock Master:
Transparent for data.
Unlike the Transparent mode, a clock master traffic signal is only cross
connected transparently in terms of its structure. The P12 output signal is
always resynchronised by the NE timing source. The input signal must be
synchronous to the output signal in order to avoid bit slips.
For details of the clock master mode, please refer to
FOX61x TDM Services".
"1KHW002467
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FOX61x LEDE1