RAD Data comm MPW-1 Specifications Page 34
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Chapter 1 Introduction Installation and Operation Manual
1-22 Functional Description MPW-1 MP-4100 Ver. 2.0
Redundancy via PSN only
Figure
1-7
shows a topology which protects TDM traffic carried over PSN against
failures in MPW-1 hardware, and in the transmission paths over PSN.
Figure
1-7. MPW-1 Redundancy – Hardware and Transmission Path Protection via PSN
To illustrate the flexibility of the redundancy schemes available for the MPW-1,
hardware redundancy is used only at the West side:
• At the West side, two MPW-1 are used, and the redundancy is configured on
internal DS1 ports located on different MPW-1 modules
• The East side uses a single MPW-1, and therefore supports only transmission
path redundancy. For this mode, redundancy is configured on internal DS1
ports located on the same MPW-1.
• To enable hardware redundancy at the East side, it is necessary to install two
MPW-1 modules, same as at the West side.
When MPW-1 external Fast Ethernet ports are directly connected to the PSN, true
hardware redundancy is always possible. When MPW-1 connection to the PSN is
provided through bridge ports on other modules, true hardware redundancy is
available only when redundancy is also enabled on the other modules. For
example, when the connection is made via the GbE ports of CL.1/155GbE
modules, redundancy for the CL.1/155GbE PSN interface must also be enabled.
For each redundancy pair, the user must first configure the internal DS1 port that
will serve as the primary port: the configuration prepared for the primary internal
DS1 port is copied to the other port of the pair. In addition, it is necessary to
configure pseudowires from each internal DS1 port in the redundancy pair to the
desired destinations. Make sure to enable OAM, which is essential to proper
operation of the redundancy feature (see the
OAM Protocol
section).
The pseudowires serving the standby (offline) internal DS1 port carry only OAM
packets, which require relatively little bandwidth. When a problem causes
switching to standby, the traffic is switched to the standby pseudowires, and the
offline pseudowires attempt to transmit OAM packets.
Redundancy switching (
flipping
) is always revertive: after the failure is corrected,
the primary port becomes again the active port.
Upon turn-on, the first port to enter normal operation is selected as the active
(online) port of the pair. Thus, if this port is not the primary port, when the
primary port starts normal operation flipping occurs and the primary port is
selected as the active port.
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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