An ‌ISA slot‌ (Industry Standard Architecture slot) is an expansion slot based on the ISA bus standard, primarily used in older computer systems for connecting peripheral devices such as sound cards, networking cards, or modems15.

Key Features of ISA Slots:
‌Physical Characteristics‌:
Typically black in color and longer than PCI slots15.
Located at the bottom edge of the motherboard1.
‌Technical Specifications‌:
Operates at a lower bandwidth (e.g., 8-bit or 16-bit data transfer) compared to modern interfaces like PCI or PCIe15.
Supports clock speeds up to 8 MHz1.
‌Usage Context‌:
Predominantly found in early IBM-compatible PCs (1980s–1990s)5.
Gradually replaced by faster standards such as PCI starting in the mid-1990s5.
The term "slot" in this context refers to a narrow opening designed to hold expansion cards, derived from the general English usage meaning a designated space or position.

ISA Motherboard 945GV Mainboard		PRI E1 T1 Card TE110PE
	Asterisk PBX
Asterisk E1 TE420		ISA Motherboard 845GV Mainboard

 

See also

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-ISDN BRI and ISDN PRI Services
-FXO vs FXS
-Global System for Mobile Communications
-About VoIP
-SIP:Session Initiation Protocol
-List of commercial voice over IP network providers
-Mobile VoIP
-FXS or FXO
-List of SIP softwares
-List of SIP software

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