CISCO SFP-25G-ER-I Optical Module sample report

      Cisco / CISCO has model SFP-25G-ER-I optical module products, can be in single-mode fiber to support 25G Ethernet transmission of 40KM, Moduletek Limited Laboratory of the product samples for testing, to facilitate a further understanding of the product's performance indicators and the effect of the actual machine use.
1. Product Introduction
      CISCO SFP-25G-ER-I optical module supports 40KM link length on 25G standard single-mode fiber (SMF) G.652 and supports industrial temperature range (-40～85℃); the module requires FEC mode of RS-FEC on the host port for full-range operation under 25G. The official key parameter information and the physical appearance of the module are as follows:

Figure 1 Physical appearance of the module

2. Module Identification
      Connect the SFP-25G-ER-I module to CISCO N9K-C93180YC-EX switch, and access the 10dBm attenuation jumper, the module can be normally LINK, and the port indicator is on; the module information can be normally recognized by the switch, such as the module type, vendor name, model number, serial number, rate, transmission distance, etc.; the DOM data can be read, and the DOM data is within the threshold range, with no data loss. can read DOM data, and the DOM data are all within the threshold range, and there is no alarm phenomenon.

Table 2 Recognition Information

3. Module key parameters test
      The performance parameters of the SFP-25G-ER-I sample module on the test plate are tested under 45°C in the laboratory module enclosure, and the test results are as follows;

Table 3 Performance key parameters

Parameter	Test data	Unit	Remarks
Transmit optical power	1.21	dBm
Receive sensitivity (over fiber)	-23.80	dBm	5E-5 BER
Receive sensitivity (over 40km fiber)	-24-78	dBm	5E-5 BER
Power consumption	1.057	W

      The sample module housing was tested with 45°C optical eye diagrams with the following eye diagram templates and parameters:

Figure 2 Eye diagram template

Table 4 Eye diagram parameters

   
      From the actual test situation, the key parameters of the module are in line with CISCO's official claims.
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