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Does a complex gateway (IGX/ BPX) the check of AAL5 CRC in both directions?

Does a complex gateway (IGX/ BPX) the check of AAL5 CRC in both directions, and

if yes, how the errors shows up (e.g complex gateway errors)?

Question aims on a Frame-relay connection which runs over a ATM Backbone.

FR--> Fastpakets --> complex Gateway --> ATM --> complex gateway --> Fastpakets

--> FR.

regards Ulrich

2 REPLIES
Cisco Employee

Re: Does a complex gateway (IGX/ BPX) the check of AAL5 CRC in b

Hi,

In your case the AAL5 PDU is assembled for data in both directions by the SAR mechanism on a particular trunk card like the UXM.

That means the CRC in the trailer of the AAL5 PDU is calculated in both directions by the same card.

Thank You

Manil Uppal

New Member

Re: Does a complex gateway (IGX/ BPX) the check of AAL5 CRC in b

Thanks!

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