Siemens S30810-Q1740-X MEM-3 Memory Plug-In Card 42514 Rev A1 Intel 8206

Siemens S30810-Q1740-X MEM-3 Memory Plug-In Card 42514 Rev A1 Intel 8206

The Siemens S30810-Q1740-X is a MEM-3 designation plug-in memory card for Siemens enterprise PBX and telecommunications switching systems, such as the HICOM and EWSD families. It carries manufacturer part number 42514, hardware revision A1, and board code FS1. The card is densely populated with memory ICs across the full board surface and interfaces with the host system through a multi-row edge connector.

Specifications & What's Included

• Manufacturer: Siemens
• Part Number: S30810-Q1740-X
• Board Designation: MEM-3
• Internal Part Number: 42514
• Manufacturing Code: MFG 32312
• Board Code: FS1
• Hardware Revision: Rev A1
• Main Controller IC: Intel 8206 (marked L8410918, © Intel '81) — ceramic LCC package, center of board
• Secondary Controller IC: Intel D8203-3 (marked L8160498, © Intel '81) — DIP package
• Supporting ICs: Texas Instruments SN74LS10N, SN74LS04N, SN74LS138N logic ICs visible on board
• Form Factor: Plug-in card / PCB module with dual edge connectors
• Board only — no chassis, cables, or accessories included

Applications

Siemens MEM-3 plug-in memory cards were used in Siemens HICOM and EWSD digital PBX telephone switching platforms — large enterprise and carrier-grade systems that handled internal and external call routing for major institutions, corporations, and telecommunications providers. Within these systems, memory cards like the MEM-3 provided the working memory needed by the switching processors to maintain call state, routing tables, and system software. The Intel 8206 and 8203-3 ICs date this board to the early-to-mid 1980s era of digital switching, when Siemens was competing directly with Northern Telecom (Nortel), Ericsson, and AT&T for large-scale PBX and central office switching contracts. These boards are sought today primarily by facilities still maintaining legacy Siemens HICOM or EWSD installations, or by technicians and collectors working with early-1980s telecommunications hardware.