Summary:
This article explains the procedure, pinouts to prepare the debug/protection cable and the procedure to access the PTP 820-G IDU via Terminal port.
Cause:
If for some reason the management interface of the PTP 820-G IDU is not responding or is damaged then as an alternate or protection path, we can access the unit via terminal port.
Solution
To access the PTP 820-G unit via terminal port we would require a debug cable (USB to Serial and serial to RJ-45) with special pinouts.
Refer below image to locate terminal port on the PTP 820-G IDU:
There are 2 parts of the cable, USB to Serial and RJ45 to Serial
Here are the terminal cable pinouts for a RJ45 to Serial cable:
RJ45 pin 4 to Serial pin 5
RJ45 pin 5 to Serial pin 2
RJ45 pin 6 to Serial pin 3
Note: We can use a standard USB to serial cable.
Refer below image showing the cable and the pinouts:
Connect only 3 pins between the DB-9 connector (Serial) and RJ-45 connector.
Note: We can use multi-meter to confirm the pins at DB9 (Serial) end by checking the continuity.
Refer below image for RJ-45 to DB9 (Serial) connector pins.
Configure the following settings for the COM port you are using on your PC or laptop:
- Bits per Seconds - 115,200,
- Data Bits – 8
- Parity – None
- Stop Bits – 1
- Flow Control - None
Once we get the cable working, we can use Putty or some other terminal program to connect to the COM port that the serial port is assigned (check in device manager). Set putty to serial with speed 115200 and default everything else.
Once we are in, instead of defaulting right away, we could just check the IP address:
platform management ip show ip-address
If you still want to default the IDU, that command is:
platform management set-to-default