System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Setting options for the 2 Mbit/s connection
Page 2-30 Proprietary Information Aastra
— The ECC8 is transmitted in the Sa7 and Sa8 bits of the system
channel.
The utilization of the ECC8 channel and signal for controlling the clock
priority can be set independently of each other.
System channel transmission can be re-routed from time slot TS0 to time
slot TS30.
Basically, the user can define as to whether the system channel shall be
used or not.
If the system channel is not transmitted in time slot TS0 or if it is not used at
all, traffic data can be transmitted in bits Sa5 to Sa8 carried in time slot TS0.
The following diagram shows the structure of TS0 in the PCM30 frame.
Rerouting the system channel (Bit Sa5 ...Sa8)
The system channel transmitted in time slot 0 can be rerouted via time slot
30 (channel 29). Thus, the Sa bits in TS0 can be made available for
transmitting a third-party system channel.
If the system channel shall be routed via a third-party node, it must also be
rerouted via time slot 30 (channel 29). In the third-party node, you must
ensure that time slot 30 (channel 29) is through-connected for system
channel transmission.
No system channel transmission
The transmission of the system channel in time slot 0 can be switched off.
This is required - for example - for ports to a third-party system if there is no
further downstream XMP1 node.
In this case, bits Sa5. . . Sa8 of time slot 0 can be used to transmit traffic
data. This option is used - for example - for a nx64k connection with the Port
nx64 module. With n=31, the signalling information must be transmitted in
bits Sa5. .Sa8 of TS0.
The designations previously used for signalling information are no longer
used in the SOX software.