PowerBit™ SD-40 40 Gb/s Intensity Modulator

PowerPort TM 2040/2140 TRX
10 Gb/s XFP Transceiver for 40km TDM & DWDM Applications
DIGITAL DIAGNOSTIC FUNCTIONS
The Avanex XFP module provides a management interface as described in the XFP standard (MSA Rev 4.5). There are
3 control input signals, 3 status output signals, and a 2-wire serial interface. The signals are described in section 2.4 of the
XFP standard. The control signals allow the module to be placed in a low-power state, to be reset, to enable/disable the
serial interface, and to turn-off the transmitter. The status signals indicate loss of received signal, detection of an invalid
condition, and the presence of additional status information via the serial interface.
The serial interface provides access to the more detailed identification and diagnostic monitoring information. It provides
access to a 256-byte register space. This interface runs at up to 400 kHz (with occasional clock stretching not exceeding
500µs), and the module supports a packet error checking protocol to verify transfer integrity. Full details are described in
chapter 4 of the XFP standard.
The register space is divided into upper and lower 128-byte spaces, as described in chapter 5 of the standard. The lower
128-bytes provides access to the more frequently accessed information, including readout of optical signal and laser
levels, alarm and warning flags, and read/write of control and status signals. The upper 128-bytes contain one of a
number of pages of information. The desired page is selected by writing a byte in the lower 128-half. Page 1 contains
extended module identification information, and page 2 provides a space of 128-bytes of non-volatile storage for the host
system.
In order to accommodate the signal conditioner device used in our XFP module, the host system shall inform the XFP
module of the data rate. The data rate is written into the upper 4 bits [7-4] of Byte 01h. The value to be entered is given
by:
Byte 01h [bits 7-4] = INT(Data rate[Gbps) – 9.5 ) /0.2))
Table below gives Byte 01h [bits 7-4] depending on the data rate used:
AFR2040408
Error Correcting Capapility
Percentage
Bandwidth
Expansion Data Rate
Required
REFCLK
Frequency
Byte
01h[bits7-4]
STS-192, 0 bytes 0% 9.953 Gbps 155.52 MHz 0010xxxx
10 Gigabit Ethernet 0% 10 Gbps 156.25 MHz 0010xxxx
10 Gigabit Ethernet 64/66B
encoded 3,125% 10.3125 Gbps 161.13 MHz 0100xxxx
10 G Fiber Channel 0% 10.5187 Gbps 164.35 MHz 0101xxxx
STS-192, Reed Solomon -
255/238 7,14% 10.66 Gbps 166.63 MHz 0101xxxx
STS-192, Reed Solomon -
255/237 7,59% 10.709 Gbps 167.33 MHz 0110xxxx
10 Gigabit Ethernet 64/66B
encoded - 255/238 7,14% 11.0491 Gbps 172.642 MHz 0111xxxx
g
encoded - 255/237 7,59% 11.0957 Gbps 173.37 MHz 0111xxxx
10 G Fiber Channel, Reed
Solomon -255/238 7,14% 11.27 Gbps 176.095 MHz 1000xxxx
10 G Fiber Channel, Reed
Solomon -255/237 7,59% 11.318 Gbps 176.84 MHz 1001xxxx
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