System information
FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Performance Parameters of a Transmission Link
Aastra Proprietary Information Page 2-81
2.11 Performance Parameters of a Transmission
Link
The performance criteria for the transmission of digital signals for different
services and transmission links are defined by ITU-T Rec. G.821.
2 Mbit ports can be defined at which the performance parameters shall be
determined on the basis of ITU-T Rec. 821. The SOX Network Manager
requests and displays the parameters measured.
In the SOX Network Manager, the performance data can be configured and
requested via the "Performance Data" window.
The performance data are stored in the database.
Performance data can be recorded for
• 2 Mbit/s PDH ports (HDB3, LEU, LE Opt)
• Central Unit CUE HDLC, VC12 (near end, far end)
• SCU internal 2Mbit E12 internal (near end)
• SCU internal 2Mbit E12 internal, VC12 (near end, far end)
• SCU external 2Mbit, PPI, D1, VC12 (near end)
• SCU OSPI, SFP, RS (near end)
• SCU OSPI, SFP, RS, MS (near end, far end)
• SCU OSPI, SFP, RS, MS, AU4 (near end)
• SCU OSPI, SFP, VC4 (near end, far end)
The following figure shows an example of the 15-minute records.
The entire time of a link is divided up as follows:
• time of availability
• time of unavailablity.
The time of availablity is subdivided again into the following performance
levels:
• error-free operation