Applications

• Ethernet Passive Optical Networks– ONT/ONU side

Standard

• Compliant with SFF MSA - 2000
• Compliant with SFF-8472 Rev.11.0
• Compliant with IEEE Std 802.3ah™ -2004
• Compliant with FCC 47 CFR Part 15, Class B
• Compliant with FDA 21 CFR 1040.10 and 1040.11, ClassⅠ
• Complies with China Telecom EPON equipment technology requirement V3.0

 

Description

The FONU-SFP-20X is an IEEE 802.3ah- compliant Ethernet Passive (EPON) Optical Network Units (ONU) with Small Form-factor Pluggable (SFP) packaging.
The FONU-SFP-20X integrates a bi-directional optical transceiver function and an EPON MAC function. By being plugged into the customer premise equipment (CPE) with standard SFP port directly, the FONU-SFP-20X provides a symmetric 1.25Gbps upstream/downstream EPON uplink to the CPE without requiring separate power supply.
The FONU-SFP-20X supports all the functions needed to comply with the standard for EPON.
The FONU-SFP-20X supports a sophisticated ONU management system, including alarms, provisioning, DHCP and IGMP functions for a stand-alone IPTV solution at the ONU.
The FONU-SFP-20X can be managed from the OLT over the EPON using IEEE 802.3ah -2004 standard OAM messaging.
The FONU-SFP-20X fits seamlessly into existing communications equipment, providing service providers with a smooth upgrade to EPON. The FONU-SFP-20X solution vastly decreases the installation costs of deploying fiber access in MDUs and enables service providers to improve their revenue streams while decreasing OPEX.
 

Absolute Maximum Ratings

Parameter	Symbol	Minim	Maxim	Unit	Note
Storage Ambient Temperature	TSTG	-40	85	°C
Operating Case Temperature	Tc	-10	85	°C
Operating Humidity	OH	5	95	%
Power Supply Voltage	VCC	0	4	V
Receiver Damaged Threshold		0		dBm

Recommended Operating Conditions

 

Parameter	Symbol	Minim	Typical	Maxim	Unit	Note
Power Supply Voltage	VCC	3.13	3.3	3.47	V	3.3V±5%
Operating Current	Icc			750	mA
Operating Case Temperature	Tc	0		80	°C
Operating Humidity Range	OH			85	%
Data Rate upstream			1.25		Gbit/s
Data Rate downstream			1.25		Gbit/s
Data Rate Drift		-100		+100	PPM

 
Transmitter Optical Characteristics

Parameter	Symbol		Minum		Typical		Maxim		Unit	Note
Optical Center Wavelength	λC		1260		1310		1360		nm
RMS Optical Spectrum Width	∆λ						3		nm	5
Average Launch Optical Power	Po		0				4		dBm	1
Power-OFF Transmitter Optical Power	Poff						-45		dBm
Extinction Ratio	ER		9						dB	2
Rise/Fall Time (20%-80%)	TR/TF						260		ps	2,3
Optical Return Loss Tolerance							15		dB
Transmitter Reflectance							-10		dB
Transmitter and Dispersion Penalty	TDP						1.8		dB
Optical Waveform Diagram	Compliant With IEEE 802.3ah-2004
Data Input Differential Swing	Vinp-p	200				1600		mV		4
Input Differential Impedance	Zin	90		100		110		Ω
Transmitter disable control Voltage - Low	Ven_L	0				0.8		V
Transmitter disable control Voltage - High	Vdis-H	2.0				VCC		V

Note 1: Launched into 9/125um Single Mode Fiber.
Note 2: Measured with PRBS 2⁷-1 test pattern @1.25Gbit/s.
Note 3: Measured with the Bessel-Thompson filter OFF.
Note 4: Compatible with LVPECL input, AC coupled internally.
Note 5: 1000BASE-PX20-U transmitter spectral limits
 

Centre Wavelength	RMS spectral width（maximum）	RMS spectral width，ε<=0.10（for reference）
nm	nm	nm
1260	0.72	0.62
1270	0.86	0.75
1280	1.07	0.93
1290	1.40	1.22
1300	2.00	1.74
1304	2.5	2.42
1305	2.55	2.5
1308	3.00
1317
1320	2.53	2.2
1321	2.41
1330	1.71	1.48
1340	1.29	1.12
1350	1.05	0.91
1360	0.88	0.77

 
 
Receiver Optical Characteristics

Parameter	Symbol	Minum	Typical	Maxim	Unit	Notes
Operating Wavelength		1480	1490	1500	nm
Sensitivity	SEN			-27	dBm	1
Saturation Optical Power	SAT	-3			dBm
LOS Assert Level	L-H	-40			dBm	2
LOS Deassert Level	H-L			-28	dBm
LOS Hysteresis		0.5		5	dB
Receiver Reflectance (max)				-12	dB
WDM Filter Isolation	ISO1	28			dB	1310nm
	ISO2	35			dB	1550nm
Data Output Differential Swing	Vp-p	600		800	mV	2
Loss of Signal Voltage - Low		0		0.8	V	3
Loss of Signal Voltage - High		2.0		VCC	V

Note 1: Measured with a PRBS 2⁷-1 test pattern @1.25Gbit/s and ER=9dB, BER =10^-12.
Note 2: LVPECL output, AC coupled internally, guaranteed in the full range of input optical power (-3dBm to -27dBm)
Note 2: An increase in optical power above the specified level will cause Signal-Detected (SD) output to switch from a high state to a low state;
A decrease in optical power below the specified level will cause Signal-Detected (SD) output to switch from a low state to a highstate.
 
Digital Diagnostic Monitor Accuracy
 

Parameter	Accuracy	Calibration	Notes
Temp report	±3℃	Internal	Case Temp ±3℃
Voltage report	±5%	Internal	Vcc=3.13~3.47V
Ibias report	±10%	Internal
Optical power output report	±2dB	Internal	Average power
RSSI	±2dB	Internal	Average power,-3 ~ -30dBm

 

Pin Description

 

PIN	Name	Description	Notes
1	VeeT	Transmitter Ground
2	TX Fault	Transmitter Fault indication	Note 1
3	TX disable	Transmitter Enable Control	Note 2
4	MOD-DEF2	Module Definition2,	Note 3, used as I2C data line
5	MOD-DEF1	Module Definition1	Note 3, used as I2C clock line
6	MOD-DEF0	Module Definition0	Note 3, internal grounded
7	Dying Gasp	Dying Gasp Indication	Note 4
8	LOS	Loss of signal indication	Note 5
9	VeeR	Receiver Ground
10	VeeR	Receiver Ground
11	VeeR	Receiver Ground
12	RD-	Inv.Receiver Data Out	Note 6
13	RD+	Receiver Data Out
14	VeeR	Receiver Ground
15	VccR	Receiver Power	Note 7, Supply 3.3V±5%
16	VccT	Transmitter Power	Note 7, Supply 3.3V±5%
17	VeeT	Transmitter Ground
18	TD+	Transmitter Data Input	Note 8
19	TD-	Transmitter Inv. Data Input
20	VeeT	Transmitter Ground

 
Note:
1. TX Fault is an open collector/drain output, which should be pulled up with a 4.7K–10KΩ resistor on the host board. Pull up voltage between 2.0V to VccT+0.3V or VccR+0.3V. High output indicates a laser fault of some kinds. Low indicates normal operation. In the low state, the output voltage will be below 0.8V.
2. TX DISABLE is an LVTTL input that is used to control the transmitter power output. Here it is not defined for TX enable logic, because it has two choice for the switch system interface
1) when it is low (0 ~ 0.8V), transmitter is on; when it is high (2 ~ 3.3V), it is off.
2) when it is high (2 ~ 3.3V), transmitter is on; when it is low (0 ~ 0.8V), it is off.
3. Mod-Def 0, 1, 2. These are the module definition pins. They should be pulled up with a 4.7K –10KΩ resistor on the host board. The pull-up voltage shall be VccT or VccR. Mod-Def 0 is grounded by the module to indicate that the module is present, Mod-Def 1 is the I²C clock line; Mod-Def 2 is the I²C data line.
4. Power fail warning. If the SPS-34-GB-P2-EDFM is about to lose power, this function detects the situation and sends a signal to warn the optical line terminal (OLT) about the impending line drop.
5. LOS (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K –
10KΩ resistor to VccT +0.3V or VccR+0.3V.  High output indicates the received optical power is below the worst-case receiver sensitivity (as defined by the standard in use). Low indicates normal operation. In the low state, the output voltage will be below 0.8V.
6. RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential line which should be terminated with 100Ω (differential) at the user SERDES.
7. VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.3V ±5% at the SFP connector pin. Maximum supply current is 750mA. Recommended host board power supply filtering is shown interface circuit. Inductors with DC resistance of less than 1Ω, in order to insure the voltage at the SFP input pin with 3.3V. When the recommended supply filtering network is used, hot plugging of the SFP transceiver module will result in an inrush current of no more than 30 mA greater than the steady state value. VccR and VccT may be internally connected within the SFP transceiver module.
8. TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with100Ω differential termination inside the module.

 

Address	Field Size	Name of Field	Hex	Description
0	1	Identifier	03	Transceiver Type
1	1	Ext. Identifier	04	Extended Identifier
2	1	Connector	01	Connector Type = SC/UPC
3～10	8	Transceiver	00 00 00 80 00 00 00 00	Compatibility
11	1	Encoding	01	Encoding Type = 8B10B
12	1	BR, nominal	0D	Nominal Bit Rate 1.25 GB/sec
13	1	Reserved	00	Reserved
14	1	Length (9um)-km	14	Link Length in Kilometers / SMF
15	1	Length (9um)	C8	Link Length in Hundreds of Meters / SMF
16	1	Length (50um)	00	50-micron MMF Link Length = N/A
17	1	Length (62.5um)	00	62.5-micron MMF Link Length = N/A
18	1	Length (copper)	00	Copper Link Length = N/A
19	1	Reserved	00	Reserved
20～35	16	Vendor name		"F-tone" ASCII
36	1	Reserved	00	Reserved
37～39	3	Vendor OUI	00 00 00	Vendor OUI SFP Vendor IEEE Company ID
40～55	16	Vendor PN	54 57 43 32 35 31 47 2D 48 33 41 4C 20 20 20 20	"TWC251G-H3AL" ASCII
56～59	3	Vendor rev	31 2E 30 20	“1.0” (ASCⅡ)
60～61	2	Wavelength	05 1E	Laser Wavelength = 1310 nm
62	1	Reserved	0	Reserved
63	1	CC BASE	XX	Check sum of bytes 0 - 62
64～65	2	Options	00 1C	1. Rx_SD；2. Tx_FAULT
66	1	BR, max	14	20%
67	1	BR, min	14	20%
68～83	16	Vendor SN	XX…XX	Programmed By factory
84～91	8	Vendor date	XX…XX	Programmed By factory
92	1	DDM Type	68	1，DDM Implemented  2，Internally calibrated
93	1	Enhanced Option	E0	1. Alarm/Warning Flags, 2. Soft Tx_FAULT Monitor
94	1	SFF-8472 Compliance	05	SFF 8472 Revision 11.0 Implemented
95	1	CC EXT	XX	Check_Sum (64 to 94) = TBD

Address	Byte	Name of Field	HEX	Real Value	Unit	Description
00~01	2	Temp High Alarm Thresholds	5A 00	90	℃	MSB at low address
02~03	2	Temp Low Alarm Thresholds	F1 00	-15	℃	MSB at low address
04~05	2	Temp High Warning Thresholds	55 00	85	℃	MSB at low address
06~07	2	Temp Low Warning Thresholds	F6 00	-10	℃	MSB at low address
08~09	2	Voltage High Alarm Thresholds	8C A0	3.6	V	MSB at low address
10~11	2	Voltage Low Alarm Thresholds	75 30	3	V	MSB at low address
12~13	2	Voltage High Warning Thresholds	88 B8	3.5	V	MSB at low address
14~15	2	Voltage Low Warning Thresholds	79 18	3.1	V	MSB at low address
16~17	2	Bias High Alarm Thresholds	88 B8	70	mA	MSB at low address
18~19	2	Bias Low Alarm Thresholds	01 F4	1	mA	MSB at low address
20~21	2	Bias High Warning Thresholds	75 30	60	mA	MSB at low address
22~23	2	Bias Low Warning Thresholds	05 DC	3	mA	MSB at low address
24~25	2	TX Power High Alarm Thresholds	7B 86	5	dBm	MSB at low address
26~27	2	TX Power Low Alarm Thresholds	1F 07	-1	dBm	MSB at low address
28~29	2	TX Power High Warning Thresholds	62 1E	4	dBm	MSB at low address
30~31	2	TX Power Low Warning Thresholds	27 10	0	dBm	MSB at low address
32~33	2	RX Power High Alarm Thresholds	18 A5	-2	dBm	MSB at low address
34~35	2	RX Power Low Alarm Thresholds	00 0F	-28	dBm	MSB at low address
36~37	2	RX Power High Warning Thresholds	13 93	-3	dBm	MSB at low address
38~39	2	RX Power Low Warning Thresholds	00 13	-27	dBm	MSB at low address
40~55	16	Reserved				Reserved

 
 
 
Calibration constants for External Calibration Option(2 Wire Address A2h)

Address	Byte	Name of Field	HEX	Description
56~59	4	Rx_PWR(4)	00 00 00 00	Set to “0” for “internally calibrated” devices.
60~63	4	Rx_PWR(3)	00 00 00 00	Set to “0” for “internally calibrated” devices.
64~67	4	Rx_PWR(2)	00 00 00 00	Set to “0” for “internally calibrated” devices.
68~71	4	Rx_PWR(1)	3F 80 00 00	Set to “1” for “internally calibrated” devices.
72~75	4	Rx_PWR(0)	00 00 00 00	Set to “0” for “internally calibrated” devices.
76~77	2	Tx_I(Slope)	01 00	Set to “1” for “internally calibrated” devices.
78~79	2	Tx_I(Offset)	00 00	Set to “0” for “internally calibrated” devices.
80~81	2	Tx_PWR(Slope)	01 00	Set to “1” for “internally calibrated” devices.
82~83	2	Tx_PWR(Offset)	00 00	Set to “0” for “internally calibrated” devices.
84~85	2	T (Slope)	01 00	Set to “1” for “internally calibrated” devices.
86~87	2	T (Offset)	00 00	Set to “0” for “internally calibrated” devices.
88~89	2	V (Slope)	01 00	Set to “1” for “internally calibrated” devices.
90~91	2	V (Offset)	00 00	Set to “0” for “internally calibrated” devices.
92~94	3	Reserved	00 00 00	Reserved
95	1	Checksum		Byte 95 contains the low order 8 bits of the sum of bytes 0 – 94.

 
A/D Values and Status Bits (2 Wire Address A2h)

Address	Byte	Bits	Name of Field	Description
96	1	ALL	Temperature MSB	Internally measured module temperature.
97	1	ALL	Temperature LSB
98	1	ALL	Vcc MSB	Internally measured supply voltage in transceiver.
99	1	ALL	Vcc LSB
100	1	ALL	TX Bias MSB	Internally measured TX Bias Current.
101	1	ALL	TX Bias LSB
102	1	ALL	TX Power MSB	Measured TX output power.
103	1	ALL	TX Power LSB
104	1	ALL	RX Power MSB	Measured RX input power.
105	1	ALL	RX Power LSB
106~109	4	ALL	Reserved	Reserved
110	1	7	Reserved	Reserved
		6	Reserved	Reserved
		5~3	Reserved	Reserved
		2	TX Fault	Tx Fail Status: 1=TX Fail; 0=TX Normal
		1	LOS	Signal Detect Status. Active High.
		0	Reserved	Reserved
111	1	ALL	Reserved	Reserved

 
Alarm and Warning Flag Bits (2-Wire Address A2h)

Address	Byte	Bits	Name of Field	Description
112	1	7	Temp High Alarm	Set when internal temperature exceeds high alarm level.
		6	Temp Low Alarm	Set when internal temperature is below low alarm level.
		5	Vcc High Alarm	Set when internal supply voltage exceeds high alarm level.
		4	Vcc Low Alarm	Set when internal supply voltage is below low alarm level.
		3	TX Bias High Alarm	Set when TX Bias current exceeds high alarm level.
		2	TX Bias Low Alarm	Set when TX Bias current is below low alarm level.
		1	TX Power High Alarm	Set when TX output power exceeds high alarm level.
		0	TX Power Low Alarm	Set when TX output power is below low alarm level.
113	1	7	RX Power High Alarm	Set when Received Power exceeds high alarm level.
		6	RX Power Low Alarm	Set when Received Power is below low alarm level.
		5~0	Reserved	Reserved
114~115	2	ALL	Reserved	Reserved
116	1	7	Temp High Warning	Set when internal temperature exceeds high warning level.
		6	Temp Low Warning	Set when internal temperature is below low warning level.
		5	Vcc High Warning	Set when internal supply voltage exceeds high warning level.
		4	Vcc Low Warning	Set when internal supply voltage is below low warning level.
		3	TX Bias High Warning	Set when TX Bias current exceeds high warning level.
		2	TX Bias Low Warning	Set when TX Bias current is below low warning level.
		1	TX Power High Warning	Set when TX output power exceeds high warning level.
		0	TX Power Low Warning	Set when TX output power is below low warning level.
117	1	7	RX Power High Warning	Set when Received Power exceeds high warning level.
		6	RX Power Low Warning	Set when Received Power is below low warning level.
		5~0	Reserved	Reserved
118~119	2	ALL	Reserved	Reserved

 
 
Vendor Specific and User Accessible EEPROM (2 Wire Address A2h)

Address	Byte	Bits	Name of Field	Description
120-127	8	ALL	Vendor Specific	Vendor Specific
128-247	120	ALL	User EEPROM	User writable EEPROM
248-255	8	ALL	Vendor Specific	Vendor Specific

Ordering Information

Part No.	Product Specification
	Package	Data-Rate	Temperature	Wavelength	Application
FONU-SFP-20A	SFP	1.25Gb/s	0°C ~70°C	TX1310nm RX1490nm	1.25G GEPON ONU Stick, 1000Base-PX20+， Complies with CTC standard
FONU-SFP-20B	SFP	1.25Gb/s	0°C ~70°C	TX1310nm RX1490nm	1.25G GEPON ONU Stick,1000Base-PX20+， Complies with DPOE standard

 
 

Related Documents

• SFF MSA - 2000
• IEEE 802.3ah - 2004
• SFF- 8472 Rev.11.0
• China Telecom EPON equipment technology requirement V3.0

 
© Copyright F-tone 2013
All rights reserved. Features and specifications are subject to change without notes.