Description
Microcom QX/12K MNP Class 7 External Modem 19VAC DB25 RS-232 RJ-11 Dial-Up
The Microcom QX/12K is a desktop external analog dial-up modem manufactured by Microcom Inc. of Norwood, MA. It supports MNP Class 7 error correction and data compression, and connects to a host computer via a DB25 RS-232 serial interface. The unit connects to the phone line through standard RJ-11 jacks on the rear panel.
Specifications & What's Included
- Manufacturer: Microcom Inc., Norwood, MA USA
- Model: QX/12K
- Error Correction / Compression: MNP Class 7
- Host Interface: DB25 RS-232 serial port (rear panel)
- Phone Line Interface: Dual RJ-11 jacks (line in / phone passthrough)
- Rear DIP switch bank: 8-position configuration switches (present and intact)
- Front panel LED indicators: T/O, O/IL, PWR, TST, OH, HS, DTR, TXD, RXD
- Power: 19VAC, 0.80A, 60Hz (external power jack)
- Form Factor: Desktop / external standalone unit
- FCC Registration No: CLB772-17318-MD-E
- Ringer Equivalence Number: 1.1B
- FCC Part 15 Class A and Part 68 compliant
- UL Listed E.D.P. Equipment (25B0)
- Note: No cable included — unit only
Applications
The Microcom QX/12K is a late-1980s to early-1990s era external dial-up modem from a period when asynchronous analog modems were standard equipment for PC-to-PC data communications, bulletin board system (BBS) access, and early online services. Microcom was a well-regarded manufacturer during this era and originated the MNP (Microcom Networking Protocol) family of error-correction standards — MNP Class 7 was among the higher-performance classes, providing both error correction and data compression over standard public switched telephone network (PSTN) lines. The DB25 RS-232 serial interface was the dominant computer-to-modem connection standard of the era, compatible with IBM PC/XT/AT and compatible systems as well as a wide range of workstations and terminals. Units like the QX/12K are sought today by vintage computing enthusiasts, retro BBS operators, and collectors restoring period-correct computer setups from the DOS and early Windows computing era.
This Microcom QX/12K MNP Class 7 External Modem has been inspected and appears to be in good used condition. The black plastic housing shows typical surface scuffs and wear consistent with prior office use, but there is no cracking or major damage. The front-panel LED indicators and model label are intact and legible. The rear DB25 serial port and dual RJ-11 phone jacks are present and appear undamaged. The DIP switch bank on the rear is present with switches intact. No cable is included — unit only. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Microcom |
Model: |
QX/12K |
MPN: |
QX/12K |
Type: |
External Dial-Up Modem |
SKU: |
8988 |
Error Correction: |
MNP Class 7 |
Interface Type: |
RS-232 (DB25 Serial) |
Connector Type: |
DB25 (RS-232), RJ-11 (2x phone jacks) |
Power Requirements: |
19VAC, 0.80A, 60Hz |
Form Factor: |
Desktop / External |
FCC Registration No: |
CLB772-17318-MD-E |
Ringer Equivalence Number: |
1.1B |
FCC Compliance: |
Part 15 Class A, Part 68 |
UL Listing: |
UL Listed E.D.P. Equipment 25B0 |
Country/Region of Manufacture: |
United States |
Seller Notes: |
No cable included. Unit only. |
Condition Notes: |
Microcom QX/12K MNP Class 7 External Modem in good used condition. Shows typical surface scuffs from prior office use. DB25 serial port, RJ-11 jacks, and DIP switches intact. No cable included — unit only. |
Condition: |
Used – Inspected |
