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Troubleshooting modem faults

Symptom

An external modem is in an abnormal state. For example, the dial tone or busy tone keeps humming.

Solution

To resolve the issue:

1. Execute the shutdown and undo shutdown commands on the physical interface connected to the

modem.

2. If the problem persists, power-cycle the modem.

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General

Product Series	MSR
Category	Network Router
IPv6 Support	Yes
WAN Interfaces	Varies by model (e.g., Gigabit Ethernet, Serial, T1/E1)
LAN Interfaces	Varies by model (e.g., Fast Ethernet, Gigabit Ethernet)
VPN Support	Yes (IPSec, L2TP, GRE)
QoS Support	Yes (Priority queuing, traffic shaping)
Redundancy	Varies by model (e.g., VRRP, dual power supplies)
Management	CLI, Web GUI, SNMP
Firewall	Yes (Stateful firewall, NAT)