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L2 Sinec: 8 byte Header data information

Created by: Mladjo at: 3/6/2009 11:11 AM (2 Replies)

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3/6/2009 11:11 AM	Rate (0)
Mladjo Posts: 14 Rating: (0)	This is call to FB252 : [code]JU FB 252 NAME: L2-SEND A-NR: KY 0,50 QTYP: KS DB DBNR: KY 0,100 QANF: KF +1 QLAE: KF +35[/code] and this are data in DB100, where first 8 bytes should contain L2 header: 0: KH 0000 1: KH 0000 2: KH 0000 3: KH 100A 4: KH 00FF 5: KH 0002 6: KH 1000 7: KH 0000 8: KH 0086 (all others bytes are zeros) Unfortunality some data in DB100 I can't understund. I dont know is this representation LSB:MSB or MSB:LSB ? From here, is destination TLN number 10 or 0A ? This confuse me also: 7-th byte is descibed as folow: rem_add_segment Logical segment address; always enter FFH (!!!) But in above data 7-th byte should be 10 or 0A (3: KH 100A). (? ) Could some one help me to understnd above header in DB100 for this FB252 call?
Mladjo Posts: 14 Rating: (0)
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3/6/2009 9:51 PM	Rate (0)
jklm Posts: 1742 Rating: (309)	Hello, You can use the Send in two ways: 1) to send data over so called "configured S5-S5 Links" In this case, the FDL service used is SDA, and there is no header in front of the data. The ANR is here between 1 and 32 for the send block 2) to use the so called layer two services. This allows to use other services than SDA, like SRD, ... Normally the A-NR used for layer two services is SEND/RECEIVE job numbers ANR (range: 134 to 186). In your example, the A-NR = 50 This ANR is normaly reserved for TF functions in the CP5430, or FMS in the CP5431. So you will have to use another ANR for layer 2 services. Let us assume that you want to use layer two services: The layer 2 header in the buffer is 8 bytes long You start sending from DW1 Therefore DW0 has no meaning : KH 0000not used Start of header: DW1: KH 0000 left 00 = FDL request, right 00 = Freely assignable ID which is returned unchanged with a confirmation DW2: KH 0000 left 00: type of service requested, where 00 = SDA (Send data with Ack) right 00: link status for a confirmation, allways 00 at SDA active side DW3: KH 100A left 10: service class, where 10 = highprio right 0A: Remote SAP, here SAP 10hex = 16 decimal DW4: KH 00FF left 00: Remote address right FF: Logical segment address, always FF Start of Data 5: KH 0002 6: KH 1000 7: KH 0000 8: KH 0086 Don't care about de logical segment. This was never used and has no meaning here. Normally with SDA, it is not common to have high prio. I would use 00 instead of 10 The remote address is 0 in your case. I guess that this is wrong. KH is hex, so if you want to send to remote partner 11 (decimal), use 0B (in hex). The remote SAP must match with what is defined at the receiver.
jklm Posts: 1742 Rating: (309)
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3/6/2009 11:15 PM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 10/31/2025 Posts: 4114 Rating: (195)	closed cause question posted twice. The second thread with the subject Where is located 8 byte header in L2 sinec L2-SEND (L2-Receive) is published within the conference Communication / Networks. Best regards CS Moderator
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
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L2 Sinec: 8 byte Header data information

Created by: Mladjo at: 3/6/2009 11:11 AM (2 Replies)

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