The 100G QSFP28 LR4 optical receiver integrates receive path onto one module. The receiver four lanes of optical data
streams are optically demultiplexed by an integrated optical demultiplexer. Each data steam is recovered by a PIN photodetector and
transimpedance amplifier, retimed, and passed on to an output driver. This module features a hot-pluggable electrical interface, low
power consumption, and 2-wire serial interface.
1: GND is the symbol for signal and supply (power) common for the module. All are common within the module and all module voltages are
referenced to this potential unless otherwise noted. Connect these directly to the host board signal-common ground plane.
2: Vcc Rx, Vcc1 and Vcc Tx shall be applied concurrently. Vcc Rx Vcc1 and Vcc Tx may be internally connected within the module in any
combination. The connector pins are each rated for a maximum current of 1000 mA. Recommended host board power supply filtering is shown
3: The ModSelL is an input pin. When held low by the host, the module responds to 2-wire serial communication commands. The ModSelL allows
the use of multiple modules on a single 2-wire interface bus. When the ModSelL is "High", the module shall not respond to or acknowledge any
2-wire interface communication from the host. ModSelL signal input node shall be biased to the "High" state in the module. In order to avoid
conflicts, the host system shall not attempt 2-wire interface communications within the ModSelL de-assert time after any modules are deselected.
Similarly, the host shall wait at least for the period of the ModSelL assert time before communicating with the newly selected module. The
assertion and de-asserting periods of different modules may overlap as long as the above timing requirements are met.
4: The ResetL pin shall be pulled to Vcc in the module. A low level on the ResetL pin for longer than the minimum pulse length (t_Reset_init)
initiates a complete module reset, returning all user module settings to their default state. Module Reset Assert Time (t_init) starts on the rising
edge after the low level on the ResetL pin is released. During the execution of a reset (t_init) the host shall disregard all status bits until the module
indicates a completion of the reset interrupt. The module indicates this by asserting "low" an IntL signal with the Data_Not_Ready bit negated.
Note that on power up (including hot insertion) the module should post this completion of reset interrupt without requiring a reset.
5: Low speed signaling other than SCL and SDA is based on Low Voltage TTL (LVTTL) operating at Vcc. Vcc refers to the generic supply
voltages of VccTx, VccRx, Vcc_host or Vcc1.
Hosts shall use a pull-up resistor connected to Vcc_host on each of the 2-wire interface SCL (clock), SDA (data), and all low speed status outputs.
The SCL and SDA is a hot plug interface that may support a bus topology. 6: ModPrsL is pulled up to Vcc_Host on the host board and grounded in the module. The ModPrsL is asserted "Low" when inserted and deasserted
"High" when the module is physically absent from the host connector.
7: IntL is an output pin. When IntL is "Low", it indicates a possible module operational fault or a status critical to the host system. The host
identifies the source of the interrupt using the 2-wire serial interface. The IntL pin is an open collector output and shall be pulled to host supply
voltage on the host board. The INTL pin is deasserted "High" after completion of reset, when byte 2 bit 0 (Data Not Ready) is read with a value of
'0' and the flag field is read (see SFF-8636).
8: The LPMode pin shall be pulled up to Vcc in the module. The pin is a hardware control
used to put modules into a low power mode when high. By using the LPMode pin and a combination of the Power_override, Power_set and
High_Power_Class_Enable software control bits (Address A0h, byte 93 bits 0,1,2), the host contrHLS how much power a module can dissipate.
9: Rx(n)(p/n) are module receiver data outputs. Rx(n)(p/n) are AC-coupled 100 Ohm differential lines that should be terminated with 100 Ohm
differentially at the Host ASIC(SerDes). The AC coupling is inside the module and not required on the Host board. For operation at 28 Gb/s the
relevant standards (e.g., OIF CEI v3.1) define the signal requirements on the high-speed differential lines. For operation at lower rates, refer to the
Note: Due to the possibility of insertion of legacy QSFP and QSFP+ modules into a host
designed for higher speed operation, it is recommended that the damage threshold of the host input be at least 1600 mV peak to peak differential.
Output squelch for loss of optical input signal, hereafter Rx Squelch, is required and shall function as follows. In the event of the optical signal on
any channel becoming equal to or less than the level required to assert LOS, then the receiver data output for that channel shall be squelched or
disabled. In the squelched or disabled state output impedance levels are maintained while the differential voltage swing shall be less than 50 mVpp.
In normal operation the default case has Rx Squelch active. Rx Squelch can be deactivated using Rx Squelch Disable through the 2-wire serial
interface. Rx Squelch Disable is an optional function. For specific details refer to SFF-8636.
10: Tx(n)(p/n) are module transmitter data inputs. They are AC-coupled 100 Ohm differential lines with 100 Ohm differential terminations inside
the module. The AC coupling is inside the module and not required on the Host board. For operation at 28 Gb/s the relevant standards (e.g., OIF
CEI v3.1) define the signal requirements on the high-speed differential lines. For operation at lower rates, refer to the relevant standards. Due to
the possibility of insertion of modules into a host designed for lower speed operation, the damage threshold of the module input shall be at least
1600 mV peak to peak differential. Output squelch, hereafter Tx Squelch, for loss of input signal, hereafter Tx LOS, is an optional function. Where
implemented it shall function as follows. In the event of the differential, peak-to-peak electrical signal on any channel becomes less than 50 mVpp,
then the transmitter optical output for that channel shall be squelched or disabled and the associated TxLOS flag set. Where squelched, the
transmitter OMA shall be less than or equal to -26 dBm and when disabled the transmitter power shall be less than or equal to -30 dBm. For
applications, e.g. Ethernet, where the transmitter off condition is defined in terms of average power, disabling the transmitter is recommended and
for applications, e.g. InfiniBand, where the transmitter off condition is defined in terms of OMA, squelching the transmitter is recommended. In
module operation, where Tx Squelch is implemented, the default case has Tx Squelch active. Tx Squelch can be deactivated using Tx Squelch
Disable through the 2-wire serial interface. Tx Squelch Disable is an optional function. For specific details refer to SFF- 8636.
一.OEM and ODM
OEM/ODM order is available.
We promise all the advertised optical transceivers are brand new with new components and parts and absolutely never use old and refurbished materials. All the optical transceivers have been through functional test and aging test. We provide 3 years warranty for all the optical transceivers from the date of shipment.
What we supply
We supply all kinds of compatible optical transceiver modules, including SFP, GBIC, SFP+, XENPAK, X2 , XFP, BIDI,CWDM,DWDM and other special transceiver modules. Our products are compatible with most of brands. If more details, please contact us.
Q:Do you sell second-hand products?
A:No.All our products are brand new,we never use second-hand components.
Q:What payment terms do you accept?
A:T/T,Paypal,Western Union are acceptable.
Q:What are the shipping ways can you offer?
A:Our usual shipping ways are DHL,FedEX,TNT,UPS,EMS etc.It will take 3-7days.
Q:Do your products come with warranty?
A:Yes,We provide 3 years warranty for all our products from the date of shipment.
Q:What devices can your products compatible with?
A:Our products are compatible with Mainstream switches.
Q:How to place an order?
A:1>Order details confirmed,please tell us the model and quantity you need.
2>Proforma Invoice confirmed, the order will be arranged upon receipt of your payment.
3>Confirm and ship the goods, then tracking number will be sent to you promptly.
4>We will help to track your goods until you receive them safely.