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AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r
9/26/02 Revision D Page 15
Enhanced Options 1
“Enhanced Options” is a 1 byte field with 8 single bit indicators which describe the 2
optional digital diagnostic features implemented in the transceiver. Since transceivers 3
will not necessarily implement all optional features described in this document, the 4
“Enhanced Options” bit field allows the host system to determine which functions are 5
available over the 2 wire serial bus. A ‘1’ indicates that the particular function is 6
implemented in the transceiver. Bits 3 and 6 of byte 110 (see Table 3.17) allow the 7
user to control the Rate_Select and TX_Disable functions. If these functions are not 8
implemented, the bits remain readable and writable, but the transceiver ignores them. 9
Finisar transceivers with alarm and warning flags enabled contain the value 10
0b10010000 at location 93. 11
Table 3.9: Enhanced Options 12
Data Address Bits Description
93 7
Optional Alarm/warning flags implemented for
all monitored quantities (see Table 3.18)
93 6
Optional Soft TX_DISABLE control and
monitoring implemented
93 5
Optional Soft TX_FAULT monitoring
implemented
93 4
Optional Soft RX_LOS monitoring
implemented
93 3
Optional Soft RATE_SELECT control and
monitoring implemented
93 2-0 Reserved
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14
15
Note that the “soft” control functions - TX_DISABLE, TX_FAULT, RX_LOS, and 16
RATE_SELECT do not meet the timing requirements specified in the SFP MSA section 17
B3 “Timing Requirements of Control and Status I/O” and the GBIC Specification, 18
revision 5.5, (SFF-8053), section 5.3.1, for their corresponding pins. The soft functions 19
allow a host to poll or set these values over the serial bus as an alternative to 20
monitoring/setting pin values. Timing is vendor specific, but must meet the 21
requirements specified in Table 3.10 below. 22
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