HP 12076A LAN/1000 LINK EL Command Examples, Example 1. Successful External Loopback Test

	Table 5%9. Interpretation of EL Loopback Test Bits
Bit Setting	Interpretation
NR = 1	The loopback test packet was not received by the LANIC card.
D = 1	The loopback test packet was deferred from transmission (for example, due
	to a busy network) for a period that exceeded a preset firmware timeout
	(approximately 1 second).
B = 1	On transmission, the number of valid packet bytes was exceeded and
	detected by the Link Controller chip (a •babble" error).
H = 1	The LANIC card's MAU did not return a heartbeat signal.
M = 1	The LANIC card memory subsystem could not be accessed by the Link
	Controller chip on the card.
BT = 1	The LANIC card transmit buffer was not properly accessed by the Link
	Controller chip.
U = 1	A transmit data underflow into the Link Controller chip occurred causing faulty
	or incomplete transmission.
L = 1	On packet transmit, a collision occurred after the allowed slot time for normal
	collision detection (•Late Collision").
LC = 1	The LANIC card lost the carrier signal of the transmit packet, that is, LAN
	medium voltage levels fell below prescribed limits.
R = 1	A collision was detected on each attempt to transmit the packet.
F = 1	Framing error. An integral number of bytes was not received.
O = 1	For the received packet, a data overflow into the Link Controller chip
	occurred.
CR = 1	For the received packet, a CRC error occurred.
BR = 1	Buffer error on the received data, or the received packet data did not match
	the transmit packet data.

EL Command Examples

The following examples illustrate command entry and response of the •Do External Loopback to MAU" command.

Example 1. Successful External Loopback Test

NM> EL<RETURN>
Do External Loopback on node	08-00-09-00-02-5A.... [ok]

NM>

In Example 1, an external loopback packet was transmitted from the node whose Station Address is 08"00"09"00"02"5A. Successful completion is indicated by the •[ok]" message.

Using Node Manager 5%39