Circuit Emulation Service Definitions, Framework and
Requirements in Metro Ethernet Networks
MEF 3
? The Metro Ethernet Forum 2004. Any reproduction of this document, or any portion thereof,
shall contain the following statement: "Reproduced with permission of the Metro Ethernet Forum."
No user of this document is authorized to modify any of the information contained herein.
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7.3.4 Synchronization Administration................................................................................................................28
7.3.4.1 Single Service-Provider Owned Network............................................................................................29
7.3.4.2 Multi Service-Provider Owned Network..............................................................................................31
7.3.4.3 Private (customer owned) Network......................................................................................................34
7.4 P
ERFORMANCE
M
ONITORING AND
A
LARMS
......................................................................................................35
7.4.1 Facility Data Link......................................................................................................................................35
7.4.2 Alarms.........................................................................................................................................................35
7.4.2.1 Unstructured Service..............................................................................................................................35
7.4.2.2 Structured Service..................................................................................................................................36
7.4.2.3 Buffer Underflow and Overflow...........................................................................................................36
7.4.2.4 Alarms in CCS Signaling......................................................................................................................36
7.4.3 End-to-End Delay.......................................................................................................................................36
7.5 S
ERVICE
I
MPAIRMENT
.........................................................................................................................................36
7.5.1 Errors within the MEN causing TDM service impairment......................................................................37
7.5.1.1 Frame Loss.............................................................................................................................................37
7.5.1.2 Frame Delay and Frame Jitter...............................................................................................................37
7.5.1.3 Bit Errors................................................................................................................................................37
7.5.1.4 Frame Error Ratio and IWF behaviour.................................................................................................37
7.5.2 Relationship to TDM service impairment metrics...................................................................................38
7.5.3 Errored Seconds Requirement for PDH Circuits.....................................................................................38
7.5.4 Severely Errored Seconds Requirement for PDH Circuits .....................................................................39
7.5.5 Service Impairments for SONET/SDH Circuits.......................................................................................41
7.5.5.1 Performance Objectives for the SONET/SDH network......................................................................41
7.5.5.2 MEN Performance Objectives ..............................................................................................................42
7.5.5.3 Summary & Discussion.........................................................................................................................45
7.5.6 Availability Requirements..........................................................................................................................45
7.6 TDM S
IGNALING
.................................................................................................................................................46
7.7 L
OOPBACKS
.........................................................................................................................................................46
7.7.1 Provider Controlled Loopbacks................................................................................................................46
7.7.2 Customer Controlled Loopbacks...............................................................................................................47
7.8 P
ROTECTION
........................................................................................................................................................48
7.8.1 Scenario 1 – dual unprotected services....................................................................................................48
7.8.2 Scenario 2 – dual protected services........................................................................................................48
7.8.3 Scenario 3 – Single protected service.......................................................................................................49
7.8.4 Scenario 4 – Single to dual interface service...........................................................................................49
7.9 S
ERVICE
Q
UALITY
...............................................................................................................................................50
7.10 EFFICIENCY ..........................................................................................................................................................50
7.11 NON-REQUIREMENTS ..........................................................................................................................................50
8. CIRCUIT EMULATION SERVICE REQUIREMENTS..................................................................................51
8.1 S
TRUCTURED
DS1/E1 N
X
64
KBIT
/
S
S
ERVICE
....................................................................................................51
8.1.1 TDM Framing.............................................................................................................................................51
8.1.2 Timeslot Assignment..................................................................................................................................51
8.1.3 Multiplexing Support..................................................................................................................................51
8.1.4 Clocking......................................................................................................................................................52
8.1.5 Jitter and Wander.......................................................................................................................................52