D-Link DVG-N5402SP

Overview
This device is used by StarHub, a Singaporean ISP.

"GRNV6.1U23" and "REV 1.0" is silkscreened on the board in the image shown below. This would strongly indicate SGE manufacture. There is an unpopulated 20-pin header labelled JTAG1 located near the Flash memory.

Serial Pinouts

 * Connector: J1
 * Pinouts:
 * 1 - Vcc
 * 2 - gnd
 * 3 - tx
 * 4 - rx
 * Speed: 115200

Pictures
User Images 

Info dump

 * H/W: A1
 * P/N: IVGN5402SPESHA1G
 * S/N: PX1D1B700XXXX (last 4 chars obfuscated)
 * BASE MAC: 84C9B2BBXXXX (last 4 chars obfuscated)
 * MTA MAC: 84C9B2BBXXXX (last 4 chars obfuscated)
 * Initial F/W: SH_1.00B043 (since upgraded to SH_2.00B054)