The 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-check
Synchronization in PDH systems connected to SDH systems
• Independent synchronization, asynchronous mapping
• The actual SDH port must be set to allow transmission of the master clock
from the PDH-system via the SDH-system in transparent mode.
• Maximum clock deviation <±50 ppm nominal, <±100 ppm operational
• Jitter and Wander according to ITU-T G.823 and G.825
• Buffer memory <100 μs
• Format: Transparent
• Maximum channel delay
• Loop time <40 ms continuous (2 x 20 ms)
IED with echo synchronization of differential clock (without GPS clock)
• Both channels must have the same route with maximum asymmetry of 0,2-0,5
ms, depending on set sensitivity of the differential protection.
• A fixed asymmetry can be compensated (setting of asymmetric delay in built
in HMI or the parameter setting tool PST).
IED with GPS clock
• Independent of asymmetry.
22.6 IEC/UCA 61850-9-2LE Merging unit requirements
SEMOD166590-11 v5
The merging units that supply the IED with measured values via the process bus
must fulfill the IEC/UCA 61850-9-2LE standard.
This part of the IEC 61850 is specifying “Communication Service Mapping
(SCSM) – Sampled values over ISO/IEC 8802”, in other words – sampled data
over Ethernet. The 9-2 part of the IEC 61850 protocol uses also definitions from
7-2, “Basic communication structure for substation and feeder equipment –
Abstract communication service interface (ACSI)”. The set of functionality
implemented in the IED (IEC/UCA 61850-9-2LE) is a subset of the IEC
Section 22 1MRK 506 375-UEN A
Requirements
486 Railway application RER670 2.2 IEC
Application manual
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