Description
IBM 66X2588 9253 V24 Communications Card 3174 Control Unit Module
The IBM 66X2588 is a V.24 (V24) communications plug-in card designed for the IBM 3174 Establishment Controller. It provides a V.24-standard serial communications interface through a 25-pin D-sub connector, allowing the 3174 to support attached terminals or downstream communications links over synchronous serial lines. The card is identified by part number 66X2588, with a secondary assembly number ECA36771A visible on the label.
Specifications & What's Included
- Manufacturer: IBM
- Model: 9253
- Part Number (MPN): 66X2588
- Assembly Number: ECA36771A
- Interface: V.24 (V.24 / RS-232 compatible serial)
- Connector: 25-pin D-sub (DB25) bracket-mounted connector
- Compatible System: IBM 3174 Establishment Controller
- Form Factor: Plug-in module card with metal bracket and card-edge connector
- Inspection stamps: CHR 118 (visible on underside)
- Included: Card only — no cables or documentation
Applications
The IBM 3174 Establishment Controller was IBM's primary cluster controller for connecting groups of 3270-family terminals to IBM mainframes running SNA (Systems Network Architecture) environments in the 1980s and 1990s. It replaced the earlier 3274 controller and was widely deployed in large enterprises, banks, government agencies, and universities running IBM System/370, 4300, and ES/9000 mainframes. The V.24 communications card (9253) adds a synchronous serial V.24 port to the 3174, used for direct connections to modems, multiplexers, or other DTE/DCE devices on the wide-area network side of the SNA link. This type of card is sought today by legacy IBM system maintainers, SNA network historians, and collectors preserving functional IBM mainframe environments.
This IBM 9253 V24 Communications Card (P/N 66X2588) for the IBM 3174 Establishment Controller has been visually inspected and appears to be in good used condition. The card housing and bracket show normal handling wear consistent with its age, and the DB25 connector appears intact. The card bears CHR 118 inspection stamps and the ECA36771A label, both visible on the underside. It has not been powered or tested at our facility but was pulled from a working IBM mainframe environment. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
IBM |
Model: |
9253 |
MPN: |
66X2588 |
Secondary Model: |
ECA36771A |
SKU: |
14297 |
Type: |
V.24 Communications Controller Card |
Compatible With: |
IBM 3174 Establishment Controller |
Interface Type: |
V.24 (V24) |
Form Factor: |
Plug-In Card / Module |
Connector Type: |
25-pin D-sub (DB25) |
Platform: |
IBM 3174 / SNA |
Country/Region of Manufacture: |
United States |
Seller Notes: |
Card only — no cables or documentation included. |
Condition Notes: |
This IBM 9253 V24 Communications Card (66X2588) for the IBM 3174 has been visually inspected and shows normal used wear. Not tested at our facility but pulled from a working environment. Card and DB25 connector appear intact. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |