VIRATA ATMOS Console Manual de usuario descargar pdf (Pagina 12)

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At the PCB of the Copperjet, the LPR signal is directly routed to the TI chip

TNETD4250. This chip will autonomously start sending the dying gasp signal on the

LPR condition, without the software on the Helium being notified. As a consequence,

the Copperjet is not able to send, for instance, an SNMP Trap. To enable the

Copperjet to do so, the LPR signal should be routed to an interrupt pin of the Helium.

Some additional investigation is required to find out whether the timing of an LPR

condition allows an SNMP Trap to be sent in time.

The LPR condition will occur as soon as the power drops for more than 30 mS, which

is 3 times the half of a means power cycle. If desired, this can be adjusted by the

component values of two resistors on the PCB. In the worst case, the TNETD4250

requires 68 mS to transmit the dying gasp message. The capacitor sizes in the power

circuitry take this requirement into account.

2.9 BOOT options

Safe booting from flash:

The system uses flash memory for storing images and configuration information;

flash provides a non-volatile method of storing data that allows field updates. The

critical period for such a system occurs when the flash memory itself is being

updated, as a power failure could result in data corruption and hence an inoperable

system.

The flash memory is generally divided into two separate areas:

• Emergency (contains boot code and minimal run-time image)

• Standard (normal run-time image)

The Emergency flash is marked as read-only and cannot be overwritten. The

emergency run-time image is used if booting from the normal run-time image fails.

Booting from the emergency image allows the user to repair/restore the normal run-

time image.

USB boot:

The system uses a file from the PC for booting the system. The file is normally stored

in the WINDOWS\SYSTEM32 directory. Replacing the file upgrades/downgrades the

device.

Network boot:(ethernet)

The system will try to find a BootP server during booting. An active BootP server with

coorect MAC address settings and a valid boot image must be available in the

network.

2.10 Dual Latency

The Copperjet Family has support of two ADSL channels (a0 and a1). Both channels can act

independent of eachother. Each channel can be used in a Fastpath or Interleavedpath mode.

The actual mode is part of the negotiationphase when a link is build. The CO will force the

Copperjet to use a particular mode for one of the two paths.

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VIRATA ATMOS Console Manual de usuario Pagina 12