Mitel Mitel MT8952B HDLC Protocol Controller - ISO-CMOS ST-BUS Family - Data Link Controller & Protocol Generator - B23002 Used, removed from decommissioned equipment. Product: MT8952B HDLC Protocol Controller Features: Formats data as per X.25 (CCITT) level-2 standards Go-Ahead sequence generation and detection Single... MSRP: Was: Now: $3.97 Add to Cart