RAD Data comm MPW-1 Specifications Page 26
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Chapter 1 Introduction Installation and Operation Manual
1-14 Functional Description MPW-1 MP-4100 Ver. 2.0
The SAToPSN packet overhead is large, and therefore, for efficient bandwidth
utilization, the number of raw TDM bytes per packet should be as large as
possible.
The receiving end restores the original bit stream, and therefore a SAToPSN
pseudowire can only be directed to another unframed E1 port, or to an
n×64 kbps protocol (where
n
must be 32, that is, to a high-speed serial port
operating at a rate of 2048 kbps).
CESoPSN Processing
CESoPSN transports raw TDM data, that is, packets are formed by inserting a
user-specified number of complete TDM frames (4 to 360 frames) in the packet
payload area. Therefore, CESoPSN pseudowires can only be configured on framed
ports.
The TDM frames are considered as serial data, even if they carry voice and CAS.
Since a CESoPSN pseudowire transports raw TDM frames, a CESoPSN pseudowire
can only be directed to another E1 framed port.
Jitter Buffer Functions
The packets of each pseudowire are transmitted by MPW-1 at essentially fixed
intervals towards the PSN. The packets are transported by the PSN and arrive to
the far end after some delay. Ideally, the PSN transport delay should be constant:
in this case, the packets arrive at regular intervals (these intervals are equal to
the intervals at which they had been transmitted). However, in reality packets
arrive at irregular intervals, because of variations in the network transmission
delay. The term Packet Delay Variation (PDV) is used to designate the maximum
expected deviation from the nominal arrival time of the packets at the far end
device.
The deviations from the nominal transmission delay experienced by packets are
referred to as jitter, and the PDV is
equal to the expected peak value of the jitter.
Note however that nothing prevents the actual delay from exceeding the selected
PDV value.
To compensate for deviations from the expected packet arrival time, MPW-1 uses
jitter buffers that temporarily store the packets arriving from the PSN (that is,
from the far end equipment) before being transmitted to the local TDM
equipment, to ensure that the TDM traffic is sent to the TDM side at a constant
rate.
For each pseudowire, the jitter buffer must be configured to compensate for the
jitter level expected to be introduced by the PSN, that is, the jitter buffer size
determines the Packet Delay Variation Tolerance (PDVT).
Two conflicting requirements apply:
• Since packets arriving from the PSN are first stored in the jitter buffer before
being transmitted to the TDM side, TDM traffic suffers an additional delay.
The added delay time is equal to the jitter buffer size configured by the user.
Not
e
Note
- TDM Pseudowire Access Gateway 1
- MP-4100 Version 2.0 3
- Quick Start Guide 5
- Interface screen 7
- Contents 11
- Chapter 1 13
- Introduction 13
- Applications 14
- Features 16
- 1.2 Physical Description 19
- 1.3 Functional Description 20
- TDM Subsystem 21
- Internal DS1 Ports 22
- Packet Processing Subsystem 23
- TDMoPSN Processing 24
- HDLCoPSN Processing 25
- SAToPSN Processing 25
- CESoPSN Processing 26
- Jitter Buffer Functions 26
- Adaptive Timing 27
- OAM Protocol 28
- Ethernet Subsystem 29
- RAD SFP Transceivers 30
- -30 -8 0 +5 31
- Redundancy 33
- Redundancy via PSN only 34
- Application Guidelines 35
- 0.125N 47 ×× 36
- MPW-1 Timing Subsystem 38
- MPW-1 Diagnostic Functions 38
- Chapter 2 41
- Installation 41
- Installing an SFP 42
- Replacing an SFP 43
- Chapter 3 45
- Configuration 45
- 3.1 Normal Indications 47
- 3.2 Default Settings 47
- Configuring Internal DS1 54
- Port Timeslot 54
- Configuring Static Routes 62
- Configuring the 66
- Pseudowire Peers 66
- Circuit Parameters 70
- Timeslot Utilization 72
- Port Timeslot Utilization 72
- Configuring 73
- References 75
- Pseudowires 77
- Chapter 4 79
- Troubleshooting and 79
- Diagnostics 79
- Monitoring Ethernet Ports 80
- 4-2. SFP Status Parameters 81
- Operation Manual 89
- Chapter 91
- 4.3 Handling Alarms 94
- 4-9. MPW-1 Specific Alarms 95
- 4.4 Troubleshooting 96
- 4.5 Diagnostic Functions 97
- Megaplex-4100 98
- Ping Test 100
- 4.6 Technical Support 101
- Customer Response Form 103
- Error Report 105
- The Access Company 108
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