 Conn:1 Line:1 TS:29 Subch:0 542401 21:05:10.026 VALID FRAME 02 13 SC 2A OC 15 01 90 OK 10 OC 08 29 80 10 28 10 31 71 63 SAPI: 0 (Oh) TEI: 9 (9h) C/R: 1 P/F: 0 N(R): 15H N(S): 2EH OC 15 01 90 OE 10 OC 08 29 80 10 28 10 31 71 63 PAGING CMD (CC) T=0 Channel Nr - downlink CCCH (PCH + AGCH) timeslot : 0 Paging Group - value I 16 (10h) MB Identity - IMSI : 206018201131736 Conn:4 Line:1 TS:30 Subch:0 542402 21:05:10.026 VALID FRAME 02 17 12 70 OC 15 01 90 OE 00 OC 08 29 80 10 28 10 31 71 63 ID: 542400 BOOSTER Confia DEFAULT.GCF Trace SALEAREPORT MULTIBCCH &2606 P. Trap: DEFAULT.GTD Record Start 05:47 PM Figure 2.47 Example of an Abis trace analyse other types of problems on the network than radio related issues. An alarm is a warning, indicating that a certain counter has reached a predefined threshold. Not all the predefined thresholds are modifiable. Different categories of alarms exist. They can be classified into six fields: Switching equipment O&M (operation and maintenance) equipment Transmission equipment Power equipment External equipment Base station alarm Each vendor has defined its own set of alarms. An example of an alarm description can contain the following parts: Alarm identifier. Alarms belonging to the same category will start with the same digits. Explanation. A brief description of the reason for the alarm and of its impact. Supplementary information fields. Interpretation of supplementary fields, if there are any. Recommended actions. There are instructions for all failure and diagnosis reports with urgency levels: one star (*) is a notification type of alarm, two stars (**) means a minor or major alarm according to the category) and three stars (***) is critical alarm. Cancelling instruction. Information on whether the user should cancel the alarm or whether the system does it after the fault situation is over. Radio Network Planning and Optimisation SDCCH observations Statistics Cause Cause number number Phase OUT count 8SC-xxx Basic assignment 8CF-xxx BTS-xxx01 Basic assignment Basic assignment B