Once it was necessary to determine which SFP modules are in EPON ports, namely C+ or C++.
First, enable DDM to see information about optical power, see my article: BDCOM OLT DDM SNMP OID
Having connected to the BDCOM, I ran the command to view information about the network interface:
show interface epoN 0/1
Below you can see what information I have displayed:
EPON0/1 is up, line protocol is up Ifindex is 7, unique port number is 7 Hardware is Giga-PON, address is 8479.735b.ad9b (bia 8479.735b.ad9b) MTU 1500 bytes, BW 1000000 kbit, DLY 2000 usec Encapsulation ARPA Flow-Control Off DDM info: TX power:6.30 dBM, RX power:-Inf dBM SFP temperature:59.94 C,supply voltage :3.36V,Bias Current.:39.60mA ...
We look at the DDM information, namely TX power, I have 6.30 dBM displayed, this means that the SFP module is C++, since the C+ modules shine with a power of about 4 dBM, and C++ about 6 dBM.
An example of viewing information about SFP modules in ethernet ports:
show interface gigaEthernet 0/5
For example, I displayed:
GigaEthernet0/5 is up, line protocol is up ... Transceiver Info: SFP,LC,1490nm,1000BASE-FX,SM 80KM DDM:YES,vend name:OEM DDM info: TX power:1.26 dBM, RX power:-7.35 dBM SFP temperature:62.56 C,supply voltage :3.28V,Bias Current.:20.35mA
Note that I had cases when the maximum distance in kilometers was displayed incorrectly, probably this is due to the firmware of the SFP module, for example, a 60KM module, and 80KM is displayed in the BDCOM terminal, therefore, when installing an SFP module, it is better to immediately make a mark somewhere, for example in the monitoring system, etc., so as not to make mistakes later.