HPE 1920-24G (JG924A)

HPE (Hewlett Packard Enterprise) OfficeConnect 1920 Series Switch.

The 1920 series features a variable number of gigabit (1000BASE-T / IEEE 802.3ab) ports, as well as a smaller number of 1 Gbit/s SFP ports.

The JG924A variant features 24 1000BASE-T ports, and 4 SFP ports. It is fanless, and has an integral AC supply (100 - 240V AC nominal). There is a console port which uses the Cisco standard pinout to provide RS232 on an 8P8C (RJ45) connector.

The 1920 series all use single core 500 MHz MIPS-4KEc Realtek RTL83xx SoCs, have 32 MB of flash, and 128 MB of RAM.

All 1920 series switches are designed to occupy “1U” (1.75“ / 44.5mm) in a standard 19” equipment rack. All models have rack mount options, but the 8 port models have smaller (under 19“ wide) enclosures which may be useful for non-rack usage.

General info about OpenWRT on Realtek switch SoCs can be found on the wiki that OpenWRT developer Sander Vanheule maintains.

FIXME break the generic 1920 series info out in to a separate page, since so much info is shared between all models in this series.

HPE 1920-24G JG924A

Design Origins and Alternative Brandings

The software and hardware design of these switches appears to originate from 3Com (which was acquired by HP in 2010), rather than the “HP ProCurve” line of switches which run HP's own in-house embedded OS rather than Linux. The design and manufacturing was carried out by H3C (which was wholly owned by HP during this time, but was later sold off).

Older examples of these switches were manufactured before Hewlett Packard split into “consumer” and “enterprise” divisions. These carried the branding “HP 1920-24G Switch” and the same JG924A model number.

H3C also sold these switches under their own brand as the H3C S5110 switch series, with the S5110-28P-SI assumed to be equivalent to the JG924A.

None at this time.

Install OpenWrt (generic explanation)

Before installing OpenWrt, you may wish to install the latest OEM firmware (at time of writing CMW520-R1121) in order to ensure you are running the latest bootloader version. You can either do-so via the OEM software web interface, or using the tftp method as outlined below.

Installation is currently via TFTP.

  1. Configure a tftp server on a computer which is reachable from the switch via Ethernet. Note the IPv4 of the tftp server.
  2. Download the “KERNEL” image from the download link below (either current or stable), rename it with a file name of 50 characters or less e.g. openwrt-23.05.2-hpe_1920-24g, and make it available to the tftp server.
  3. Connect to the serial port on the front of the switch using an 8P8C RS232 adapter.
  4. Power on the switch.
  5. Allow the switch to begin booting its second stage bootloader.
  6. When prompted Press Ctrl+B to enter extended boot menu..., do-so.
  7. Select menu item 3 Enter Ethernet SubMenu.
  8. In the Ethernet SubMenu, select item 5 Modify Ethernet Parameter.
  9. When prompted Protocol (FTP or TFTP), enter tftp.
  10. When prompted Load File Name enter the name you chose above.
  11. When prompted Target File Name leave it unchanged (value is not used).
  12. When prompted Server IP Address enter the IPv4 address of the tftp server.
  13. When prompted Local IP Address enter a spare unused IPv4 address which is accessible from the tftp server (e.g. an unused IP address on the local subnet).
  14. When prompted Gateway IP Address enter a value if the Local and tftp Servers are on different subnets, otherwise leave at the default.
  15. Back at the Ethernet SubMenu, select item 1 - Download Application Program To SDRAM And Run.

OpenWRT will now boot from RAM (it is not yet on flash). At this point you may wish to backup the existing factory firmware and configuration - either by following the create_full_mtd_backup instructions, or by downloading a copy of every mtd partition via the LuCI web interface (e.g. at http://192.168.1.1/cgi-bin/luci/admin/system/flash ).

Once that is done, you can download and install the sysupgrade package to overwrite the factory firmware install, then you will need to follow the instructions in the Initial installation: section of the git commit message to configure the bootloader to automatically run OpenWrt.

dev:    size   erasesize  name
mtd0: 00050000 00010000 "bootware_basic"
mtd1: 00030000 00010000 "bootware_data"
mtd2: 00040000 00010000 "bootware_extend"
mtd3: 00050000 00010000 "bootware_basic_backup"
mtd4: 00030000 00010000 "bootware_data_backup"
mtd5: 00040000 00010000 "bootware_extend_backup"
mtd6: 01cf0000 00010000 "firmware"
mtd7: 00010000 00010000 "factory"

FIXME The instructions below are for Broadcom devices and only serve as an example.
Remove / modify them if they do not apply to this particular device!

This section deals with

  • How you install OpenWrt from a device freshly opened
  • The steps required such as reset to factory defaults if the device has already been configured

Note: Reset router to factory defaults if it has been previously configured.

  • Browse to http://192.168.1.1/Upgrade.asp
  • Upload .bin file to router
  • Wait for it to reboot
  • Telnet to 192.168.1.1 and set a root password, or browse to http://192.168.1.1 if LuCI is installed.

Specific values needed for tftp

FIXME Enter values for “FILL-IN” below

Bootloader tftp server IPv4 address FILL-IN
Bootloader MAC address (special) FILL-IN
Firmware tftp image Latest OpenWrt release (NOTE: Name must contain “tftp”)
TFTP transfer window FILL-IN seconds
TFTP window start approximately FILL-IN seconds after power on
TFTP client required IP address FILL-IN

generic.sysupgrade

FIXME These are generic instructions. Update with your router's specifics.

  • Browse to http://192.168.1.1/cgi-bin/luci/mini/system/upgrade/ LuCI Upgrade URL
  • Upload image file for sysupgrade to LuCI
  • Wait for reboot

If you don't have a GUI (LuCI) available, you can alternatively upgrade via the command line. There are two command line methods for upgrading:

  • sysupgrade
  • mtd

Note: It is important that you put the firmware image into the ramdisk (/tmp) before you start flashing.

sysupgrade

  • Login as root via SSH on 192.168.1.1, then enter the following commands:
cd /tmp
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
sysupgrade /tmp/xxx.abc

mtd

If sysupgrade does not support this router, use mtd.

  • Login as root via SSH on 192.168.1.1, then enter the following commands:
cd /tmp
wget http://downloads.openwrt.org/snapshots/trunk/XXX/xxx.abc
mtd write /tmp/xxx.abc linux && reboot

Basic configuration After flashing, proceed with this.
Set up your Internet connection, configure wireless, configure USB port, etc.

FIXME Please fill in real values for this device, then remove the EXAMPLEs

The default network configuration is:

Interface Name Description Default configuration
br-lan EXAMPLE LAN & WiFi EXAMPLE 192.168.1.1/24
vlan0 (eth0.0) EXAMPLE LAN ports (1 to 4) EXAMPLE None
vlan1 (eth0.1) EXAMPLE WAN port EXAMPLE DHCP
wl0 EXAMPLE WiFi EXAMPLE Disabled

FIXME Please fill in real values for this device, then remove the EXAMPLEs

Numbers 0-3 are Ports 1-4 as labeled on the unit, number 4 is the Internet (WAN) on the unit, 5 is the internal connection to the router itself. Don't be fooled: Port 1 on the unit is number 3 when configuring VLANs. vlan0 = eth0.0, vlan1 = eth0.1 and so on.

Port Switch port
Internet (WAN) EXAMPLE 4
LAN 1 EXAMPLE 3
LAN 2 EXAMPLE 2
LAN 3 EXAMPLE 1
LAN 4 EXAMPLE 0

hardware.button on howto use and configure the hardware button(s). Here, we merely name the buttons, so we can use them in the above Howto.

FIXME Please fill in real values for this device, then remove the EXAMPLEs

The HPE 1920-24G JG924A has the following buttons:

BUTTON Event
EXAMPLE Reset reset
EXAMPLE Secure Easy Setup ses
EXAMPLE No buttons at all. -

Measured with the switch idle, with all Ethernet ports down, and no SFP modules installed:

HP Firmware v5.20.99 r1105 6.3 Watts
OpenWRT 23.05.2 7.0 Watts

Front:
Insert photo of front of the casing

Back:
Insert photo of back of the casing

Backside label:
Insert photo of backside label

Note: This will void your warranty!

FIXME Describe what needs to be done to open the device, e.g. remove rubber feet, adhesive labels, screws, ...

  • To remove the cover and open the device, do a/b/c

Main PCB:
Insert photo of PCB

port.serial general information about the serial port, serial port cable, etc.

How to connect to the Serial Port of this specific device:
Insert photo of PCB with markings for serial port

FIXME Replace EXAMPLE by real values.

Serial connection parameters
for HPE 1920-24G (JG924A)
EXAMPLE 115200, 8N1, 3.3V

port.jtag general information about the JTAG port, JTAG cable, etc.

How to connect to the JTAG Port of this specific device:
Insert photo of PCB with markings for JTAG port

None so far.

System is starting...
Press Ctrl+D to access BASIC-BOOTWARE MENU
Booting Normal Extend BootWare
The Extend BootWare is self-decompressing.......................Done!

****************************************************************************
*                                                                          *
*            HP 1920-24G Switch JG924A BootWare, Version 1.10              *
*                                                                          *
****************************************************************************
Copyright (c) 2010-2014 Hewlett-Packard Development Company, L.P.

Compiled Date       : Jun  5 2014 11:34:07
CPU Type            : MIPS4kec
CPU L1 Cache        : 16KB
CPU Clock Speed     : 500MHz
Memory Type         : DDR3 SDRAM
Memory Size         : 128MB
Memory Speed        : 300MHz
BootWare Size       : 3MB
Flash Size          : 32MB


BootWare Validating...
Press Ctrl+B to enter extended boot menu...
Starting to get the main application file--flash:/JG924A-CMW520-R1105.bin!..
............................................................................
...............
The main application file is self-decompressing.............................
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...Done!
System application is starting...
Startup configuration file does not exist.
Configuring default settings.
User interface aux0 is available.



Press ENTER to get started.

COPY HERE THE BOOTLOG ONCE OPENWRT IS INSTALLED AND RUNNING


Space for additional notes, links to forum threads or other resources.

  • ...

FIXME Add tags below, then remove this fixme.

How to add tags

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  • Last modified: 2024/02/12 11:13
  • by 127.0.0.1