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Configuration Requirements for Circuit Recovery Selection Path Recommended Setting Config > Network Interface > XCV Threshold 1E-3 (see the following note) Config > Network Interface > Network Protection Disabled Config > Network Interface > Max. Switch Threshold 3 Config > Network Interface > Min. Switching Period 10 seconds Config > T1/E1 Interface > T1/E1 Circuit Protection Enable all or select the T1/E1s that redundant switching should occur on. Config > T1/E1 Interface > XCV Threshold 1E-3 (see the following note) The XCV Threshold settings are based on the error rates considered acceptable on the STS-1 or DS-1 before switching. CIRCUIT AND NETWORK FAILURE RECOVERY MODE In this mode, two controller cards are installed and connected to two individual STS-1 lines. This is, of course, the most complete mode of redundancy. In this mode, the primary controller card is connected to the primary STS-1 line and the secondary controller card is connected to the secondary STS-1 line. The primary card and line actively transmit data, while the other card and line stand by ready to take over if the first card and line fail. For example, if CARD A fails, then control switches to CARD B and NET B. An important feature of the MX2800 STS-1 is its ability to internally re-route the network connection if a controller card and the opposite network connection fail. For example, in the illustration given in Figure 7-3, failed NET A is connected to healthy CARD A; and healthy NET B is connected to failed CARD B. MX2800 STS-1 User Manual 61200659L1-1 Chapter 7. Circuit and Network Redundancy In a case like this, the MX2800 STS-1 is able to automatically reroute NET B to CARD A. The configuration requirements for this mode are the same as the ones given for Circuit Failure Recovery Mode (see Table 7-1 on page 7-4) except for the NETWORK PROTECTION setting, which must be set to ENABLE. MX2800 STS-1 Figure 7-3. Circuit and Network Failure Recovery Mode 61200659L1-1 MX2800 STS-1 User Manual Chapter 7. Circuit and Network Redundancy MX2800 STS-1 User Manual 61200659L1-1 Chapter 8 Power Loss Recovery The MX2800 STS-1 provides backup measures of protection for both power supply and power source failures. The following sections describe the possible modes of operation: • Non-Redundant Power Mode, which offers no backup protection, is described on page 8-2. • Power Supply Recovery Mode, which offers backup protection in the event of power supply card failure, is described on page 8-3. • Power Supply and Source Recovery Mode, which offers a backup system for both card and source failure, is described on page 8-4. • Battery Backup Mode, which offers battery backup in the event of a power outage, is described on page 8-5. 61200659L1-1 MX2800 STS-1 User Manual Chapter 8. Power Loss Recovery NON-REDUNDANT POWER MODE In Non-Redundant Power Mode, the MX2800 STS-1 houses only one power supply card and only one power source is available. There is no power failure protection. If a power supply card fails, then the unit is inoperable until the card is repaired or replaced. See Figure 8-1 for an illustration. MX2800 STS-1 Figure 8-1. Non-Redundant Power Mode Power supplies are hot-swappable. MX2800 STS-1 User Manual 61200659L1-1 Chapter 8. Power Loss Recovery POWER SUPPLY RECOVERY MODE In Power Supply Recovery Mode, two power supply cards are installed and connected to a single power source (see Figure 8-2). In this mode, the MX2800 STS-1 can continue to operate during a power supply failure, without interrupting service. The power supplies are load sharing, so either power supply can provide power for the entire unit. When the unit is configured with dual internal AC power supplies, this is the only power protection mode available. MX2800 STS-1 Figure 8-2. Power Supply Failure Recovery Mode 61200659L1-1 MX2800 STS-1 User Manual Chapter 8. Power Loss Recovery POWER SUPPLY AND SOURCE RECOVERY MODE In this mode, two power supply cards are installed and are connected to two individual power sources. The MX2800 STS-1 handles any combination of power source or power supply failure. Much like the backup design for the controller cards, the MX2800 STS-1 is able to internally re-route the power source if a power supply card and the opposite power source fail. For example, in the illustration given in Figure 8-3, failed POWER SOURCE A is connected to functional CARD A and functional POWER SOURCE B is connected to failed CARD B. In this case, the MX2800 STS-1 automatically connects POWER SOURCE B to CARD A. This configuration is only available with DC power supplies. STS-1 Figure 8-3. Power Supply and Source Failure Recovery Mode MX2800 STS-1 User Manual 61200659L1-1 Chapter 8. Power Loss Recovery BATTERY BACKUP MODE With the installation of the ADTRAN Power Supply/Battery Charger (PS/BC) and backup battery pack, the MX2800 STS-1 is able to continue operation without service interruption during a power outage. This PS/BC (P/N 4175043L2) provides -48 VDC to...

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