3Com S330 manual SIM Alarms, Describes the alarms specific to QSIMs and FAMs, Qsim Alarms

Managing System Alarms 177

Table 29 DSX-1/E1 CBR Module Alarms (continued)

Transmit FIFO	The cell bus is congested, and
Overflow	cells are backed up on the CBR.
	Traffic at the output side of the
	CBR port is being transmitted
	more slowly than it is being
	received from the cell bus. As a
	result, the output buffer is
	overflowing. In general, the
	problem is that the CBR
	connection is not synchronized
	end-to-end. The clock rate of
	the output port does not
	match the clock rate of the
	device from which the traffic
	originated.
VC RDI Receive	VC RDI (Remote Defect
	Indication) OAM received in
	the connection. The far end
	equipment has a problem with
	the signal it is receiving,
	indicating that the problem lies
	between the network provider
	and the far end terminal
	equipment for this connection.

The entire CBR connection must be synchronous end-to-end. Make sure the clock rates of the devices at either end of the connection match each other and match the transmit clock rate of the CBR ports on the PathBuilder device.

Check for a defective cable between the far end interface port and your service provider's network interface unit. An open transmit line can cause this condition.

SIM Alarms

Table 30 describes the alarms specific to QSIMs and FAMs

Table 30 QSIM Alarms

Alarm Meaning Troubleshooting Steps

LMI Link Down	The Local Management
	Interface has taken the link
	down.

Check the LMI protocol configuration for the port.

Voice Compression Module Alarms

Table 29 describes the major alarms specific to the Voice Compression module.

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Table 31 Voice Compression Module Alarms

Alarm	Meaning
E1 Loss of CAS	E1 signaling multiframe
Multiframe	alignment has been lost.
E1 Time Channel 16	All 1s in E1 time slot 16 for 2
AIS Rcv	consecutive frames.
Far End E1 Loss of	The far end device has lost
CAS	Channel Associated signaling.
Channel PCM	A loopback is configured on
Loopback	the channel. Loopbacks are for
Condition	troubleshooting only and
	should not be present during
	normal operating conditions.

Troubleshooting Steps

Check the physical connection and the carrier for configuration problems.

Make sure both the local device and the far end device are configured for Time Slot 16 framing. If both devices are correctly configured, there may be a hardware problem in either device.

Check the E1 configuration of the far end device.

If you are not troubleshooting the channel, turn off the loopback.