MediaMatrix nTouch 60 Manuál stáhnout pdf (Strana 71)

NION Hardware Manual

May 17, 2011 Version 1.6.2a.0 67

A hardware error can also be caused by a NION operating at elevated temperature. Address

cooling and ventilation issues when this cause is suspected.

Case 2 - Firmware malfunction

Firmware malfunction is the primary focus of this troubleshooting section. This cause of

failure is characterized by proper operation of the NION followed by occurrence of an HF2

error. Subsequent power cycling of the NION can return the device to proper operation.

Although the root cause is a firmware problem, there are network related issues that can

stimulate the problem and steps that can be taken to mitigate it.

The CM-1 firmware, up to and including version 2.9.16, contains a bug. This bug will allow a

stack overflow to occur during times of excessive network traffic that will render the CM-1

inoperative. A fix is not currently available, but is being worked on. This problem can occur in

any CM-1 module installed in a NION, CAB or Mainframe.

Note: The CAB 4n is available with both CM-1 and CM-2 modules. Only CM-1 modules are

affected.

Verification of the problem - all conditions will be present

 The CM-1 will initially work properly.

 The CM-1 will become unresponsive. This can be indicated by an inability to change

bundles.

 An HF2 related error will be logged.

 All audio bundles in and out of the CM-1 will stop.

 The CobraNet interface will not show active in CobraNet Discovery.

 The LED indicators on the CobraNet RJ-45 Ethernet connectors will most likely be static

and in a random state. They will not be blinking in the normal pattern that indicates

CobraNet activity. In some cases, the lights will blink in a repeatable pattern of 7,6,2.

 A hardware reset will correct the problem.

The causes of firmware malfunction

Presence of excessive network traffic, also known as a data storm, can cause a stack overflow

to occur. A data storm can be caused by the presence of a loop in the network. Loop problems

can be more acute in larger networks and in networks that contain gigabit Ethernet links. A

data storm can also be caused by malfunctioning equipment in rare cases.

Some devices will transmit multicast data in normal operation. In a large network, if many or

all devices on the net do so by coincidence at the same time, a condition similar to a data storm

can occur and have similar consequences for a brief instant.

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MediaMatrix nTouch 60 Manuál Strana 71