CorDES Proprietary Information
21
Parameter
Description
PT/CT Link Status
UP: Valid Layer-2 Link Layer connection has been established with the logical
channel.
DOWN: Valid connection has not been established.
Crypto Direction
Indicates whether the channel is configured for encryption (UPLINK) or
decryption (DOWNLINK)
Outbound (Tx)
Count of the number of packets transmitted on the channel since the last
reset.
Inbound (Rx)
Count of the number of packets received on the channel since the last reset.
Packet Drops
This is the number of packets dropped due to Layer-2 errors (e.g. bad CRC,
Bad symbols, overflow of buffers at PHY etc)
Auth Fails
Future use.
Timeouts
This Counter is incremented for any packet send from the CDNA-041G to the
embedded GOE that is not responded to. The various reasons are that the
GOE did not recognize the GCM header, the GCM packet has invalid integrity,
the VCC is invalid (in vehicle sim mode), or the GOE is not ready for data.
Table 5-3 CDNA Real-Time Information
5.2.9
Packet Loss & Debug
Using the Real-Time counters, you can determine if data is getting to the CDNA from the
network, and if it is being sent back successfully post Encrypt/Decrypt GOE processing, or if it is
being discarded.
If packets are arriving to the CDNA (Inbound (Rx)) counter is incrementing, but the Outbound
(Tx) is not incrementing then packets are being lost. Typically, this will be accompanied by the
TIMEOUTS counter incrementing; this implies data is received by the CDNA, send to the
embedded GOE, but no response was received from it within the expected time. In this case
the CDNA
marks the “Timeout/Payload Lost” bit in the CDNA TCP/IP packet header and
forward the header and any bypass out the IP port to the remote client. Usually this is due to
malformed packets or unauthentic packets in GCM mode.
