Popular discussions about programming, compatibility and testing of optical transceivers.
The poster could read and write OEM SFP variants with a REVELPROG and SFP adapter but not three Finisar references, suspecting manufacturer password protection. Finisar only documents the MSA user-EEPROM password in datasheets, not the proprietary manufacturer password, and the same happened with…
The storage box went from Core 13.0-U6.7 to SCALE 24.04 and then on to 24.10, and ever since one port is crawling while its twin on the same card is perfectly happy. The 25G card behaves the same way, which is what makes me doubt my own eyes. Intel X520-DA2 with Intel multimode SFP+ optics, 10G to…
Even with allow-unsupportted-transceiver enabled, HPE Aruba 3810M and 2930M switches showed an amber fault for generic SFP+ modules, including ones recoded to masquerade as a J9151A. The author traced the behaviour to HPE's HPIDv2 challenge-response authentication: the module EEPROM carries a flag…
The poster could not find Cisco documentation describing how to set the frequency or ITU channel of a DWDM-SFP10G-C tunable 10G SFP+. A follow-up question asked whether a CPAK-100G-LR4 in a CRS-X 4-port 100GE LAN/OTN card could be tuned to a wavelength and connected directly to a ROADM of an…
A UCG-Fiber used a UACC-CM-RJ45-MG 10GBASE-T module (port 6, later port 7) to reach a Zyxel XS1930. Whenever the copper cable was disconnected for more than about 40 s or the Zyxel rebooted, the link never came back until the module was pulled for a minute or the gateway rebooted; forcing 10G or 1G…
A customer saw errors on a fibre link and suspected a speed mismatch with a 1G far end. The poster asked whether 10G SFP+ transceivers are backward compatible with 1G, or whether the modules had to be swapped for 1G SFPs to talk to the gigabit device on the other side. Hardware involved: Aruba…
A QSFPTEK 10GBASE-T SFP+ module installed in port ix1 of a passively cooled Netgate 6100 reported 73 C through DDM although the room was at 20 C; the module is specified for 0-70 C and up to 2.5 W. The poster asked for known-good RJ45 SFP+ modules that stay within spec. Hardware involved: Netgate…
The poster asked whether anyone had used third-party optcis in a Cisco Catalyst 9300 series switch running IOS XE Everest (16.x), and specifically whether the hidden global command 'service unsupported-transceiver', long used on older Catalyst platforms to accept non-Cisco SFPs, still functions on…
The poster needs a 100GE link between a Cisco NCS55A2-MOD (NC55-MPA-4H-S MPA) and a Cisco Catalyst C9500-48Y4C using a QSFP-100G-CU1M DAC. Both platforms list the cable as supported, yet the link never comes up at the physical level. Because the Catalyst 9500 lacks 100G auto-negotiation (bug…
A FLYPRO SFP-1G-CS-100M 1000BASE-T module in a MikroTik CRS112-8P-4S (RouterOS 6.47.10) was detected but reported no-link with sfp-rx-loss: yes, whatever the far end (MikroTik LHG/RB750Gr3, Ubiquiti, Cisco). Fixed 1G speeds, other module units and rebootts were tried; only a Ubiquiti switch linked…
Mellanox-branded Q-4S28AO03 3 m QSFP28 AOC 1x4 breakout cables (100G with FEC) that worked under Onyx 3.9.1908 stopped linking after an upgrade to Onyx 3.10.x. The ports reported Cable speed not enabled and, with auto speed, Negotiation failure; supported speeds showed 1G/10G/25G but the actual…
Installing a new MES2324FB at a site to replace old hardware. The uplink is 1G fiber to an Alcatel 6224, Foxgate modules from the same batch as at neighboring sites. Setup: Eltex MES2324FB, firmware 4.0.4.7, also tried 4.0.6 - no difference 1G SFP Foxgate on both ends of the link far end - Alcatel…
On two sites a UNAS Pro (UniFi RJ45 SFP+ module) and a UNVR (UniFi fibre SFP+ module) dropped to 1G after every firmware update or power cycle; rebooting the device, the port or the switch did not help, only physically pulling and reinserting the module (or reseating the fibre) restored an…
Small homelab, two second-hand switches and a drawer of optics collected over the years, most of which the hosts refuse because of the vendor code. Recoding has always been the blocker: a proper programmer sits around 369 USD, which is more than I paid for the switches, and the Ubiquiti SFP Wizard…
In a home lab with an Aruba S2500 PoE switch and an Intel X520-DA2, three of thirteen cheaply bought Intel AFBR-703SDZ-IN2 SFP+ modules (around 15 USD each) failed within three months: links dropped with dark activity LEDs, two on the switch side and one on the NIC side. Warm and cold reboots…
