24.4 PTP requirements GUID-741CC863-D760-49D6-85B2-AFECA222A8C3 v1For PTP to perform properly, the Ethernet equipment that is used needs to becompliant with IEEE1588. The clocks used must follow the IEEE1588 standardBMC (Best Master Algorithm) and shall, for instance, not claim class 7 for a longertime than it can guarantee 1us absolute accuracy.24.5 Sample specification of communicationrequirements for the protection and controlterminals in digital telecommunication networksGUID-0A9F36AF-3802-42FE-8970-4662798C19D1 v2The communication requirements are based on echo timing.Bit Error Rate (BER) according to ITU-T G.821, G.826 and G.828• <10-6 according to the standard for data and voice transferBit Error Rate (BER) for high availability of the differential protection• <10-8-10-9 during normal operation• <10-6 during disturbed operationDuring disturbed conditions, the trip security function can cope with high bit errorrates up to 10-5 or even up to 10-4. The trip security can be configured to beindependent of COMFAIL from the differential protection communicationsupervision, or blocked when COMFAIL is issued after receive error >100ms.(Default).Synchronization in SDH systems with G.703 E1 or IEEE C37.94The G.703 E1, 2 Mbit shall be set according to ITU-T G.803, G.810-13• One master clock for the actual network• The actual port Synchronized to the SDH system clock at 2048 kbit• Synchronization; bit synchronized, synchronized mapping• Maximum clock deviation <±50 ppm nominal, <±100 ppm operational• Jitter and Wander according to ITU-T G.823 and G.825• Buffer memory <250 μs, <100 μs asymmetric difference• Format.G 704 frame, structured etc.Format.• No CRC-checkSynchronization in PDH systems connected to SDH systems1MRK 511 401-UEN A Section 24RequirementsBay control REC670 2.2 IEC 607Application manual
