56 Fibre Channel Interface Manual, Rev. D

9.2 Extended link services

The type of extended link service is identified by the LS Command Code in the first word of the payload. The

R_CTL field of the frame header identifies whether the extended link service is a request or a reply to a

request. The accept for extended link services varies with the function. A description of the accept for each

request is included with the description of the request.

Table 21: Extended link services header

Bit
Byte
76543210
00010001X
R_CTL
1 (MSB)
D_ID2
3(LSB)
400000000
Reserved
5 (MSB) S_ID
6
7(LSB)
800000001
Typ e
9 (MSB)
F_CTL10
11 (LSB)
12 SEQ_ID
1300000000
DF_CTL
14 (MSB) SEQ_CNT
15 (LSB)
16 (MSB) OX_ID
17 (LSB)
1811111111
1911111111
RX_ID
20 (MSB)
Paramet er
21
22
23 (LSB)