Hello all;
I have noticed very strange behavior with the gsc3570 Intercom. When I connect this station to the cisco 2960-x switch the intercom starts up normally. The displays goes up and works - I can acces the phone menu and other functions. The power inline on the switch port shows device connected and powered, but the Ethernet ports is flapping continuously - up…down…up…down.
No others errors are observed on the switch.
Dec 15 11:58:57: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to up
Dec 15 11:58:59: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to down
Dec 15 11:59:03: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to up
Dec 15 11:59:06: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to down
Dec 15 11:59:10: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to up
Dec 15 11:59:12: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to down
Dec 15 11:59:17: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to up
Dec 15 11:59:19: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/18, changed state to down
I have tried different port and intercom configuration - vlan tagged port, access port, auto speed/duplex, speed duplex set for 100TXFD, cdp on/off, lldp on/off.
The power budget on the switch is OK. I have also add 2x power mode (to give the intercom avibility to consume 30W of power on connected port) - with the same effect.
I have upgraded the firmware on GSC to the newest beta available - nothing changes here.
Nothing helps here.
The only way to get the port up and running is to connect anything active to the second Ethernet port on the intercom - it could be another port on the same switch, port in pc, or any other device with active Ethernet port
When the port has gone up I can disconnect the second port in the intercom and it works without any problems till next reboot.
I have made some tests with thee devices and two different Cisco switches - the behavior of gsc3570 is always the same.
I need to connect the second port to get the first one (with PoE) to go up.
I have connected to the same switch GDS3170 video doorphone about 20 gxp1625 phones and all these devices work without any issues.
I have no idea - its look like a bug - the device need to both ports connected on startup to bring up the Ethernet interface(and this is the only way to get it work). Could somebody help?