The Multiplexer-Demulti, cataloged under National Stock Number 5820-01-121-1957, is classified within Federal Supply Class 5820 (Radio and Television Communication Equipment, Except Airborne) of the Communication, Detection, and Coherent Radiation Equipment group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Multiplexer-Demulti |
| FSC / FSG | 5820 — Radio and Television Communication Equipment, Except Airborne (FSG 58) |
| Parameter | Value |
|---|---|
| NSN | 5820-01-121-1957 |
| Item Name | Multiplexer-Demulti |
| FSC / FSG | 5820 / 58 — Radio and Television Communication Equipment, Except Airborne |
| Status | ACTIVE |
| General Characteristics Item Description | ACCEPTS PORT RATES IN 1 TO 16 PORTS FROM 35 B/S UP TO 32 KB/S; PROVIDES CHANNEL OUTPUT RATE FROM 1.2 KB/S TO 256 KB/S AS SINGLE SERIAL COMBINE RATE; ACCEPTS SYNCHRONOUS,ISOCHRONOUS AND ASYNCHRONOUS DATA; PROVIDES SYNCHRONOUS DATA; DEMULTIPLEXER ACCEPTS PORT INPUT RATES FROM 1.2 KB/S TO 256 KB/S; PROVIDES OUTPUT RATES FROM 35 B/S TO 32 KB/S; TRANSMITS SYNCHRONOUS,ISOCHRONOUS AND ASYNCHRONOUS DATA,ACCEPTS AND PROCESSES SYNCHRONOUS DATA; HAS BITE,MONITOR AND ALARM SYSTEM,TIMING,CONTROLS,FRAMING,SYNCHRONIZATION SYSTEMS; OPERATING PWR REQMTS ONLY PROVISIONS FOR AC OR DC; O/A DIMS AND WEIGHT 22.6 IN. LG; 19.0 IN. W; 7.0 IN. H; 50LBS; MOUNTING DATA 19 IN. RACK MTG,AND OPEN RACK PROVISIONS FOR KB |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| TD-1349(P)/FCC-100(V) | 5/2 Secondary reference U.S. Government activity |
| 94890006-000 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5820-01-121-1957 is a Multiplexer-Demulti, classified under FSC 5820, Radio and Television Communication Equipment, Except Airborne. Status: active.
Key specifications for 5820-01-121-1957: General Characteristics Item Description: ACCEPTS PORT RATES IN 1 TO 16 PORTS FROM 35 B/S UP TO 32 KB/S; PROVIDES CHANNEL OUTPUT RATE FROM 1.2 KB/S TO 256 KB/S AS SINGLE SERIAL COMBINE RATE; ACCEPTS SYNCHRONOUS,ISOCHRONOUS AND ASYNCHRONOUS DATA; PROVIDES SYNCHRONOUS DATA; DEMULTIPLEXER ACCEPTS PORT INPUT RATES FROM 1.2 KB/S TO 256 KB/S; PROVIDES OUTPUT RATES FROM 35 B/S TO 32 KB/S; TRANSMITS SYNCHRONOUS,ISOCHRONOUS AND ASYNCHRONOUS DATA,ACCEPTS AND PROCESSES SYNCHRONOUS DATA; HAS BITE,MONITOR AND ALARM SYSTEM,TIMING,CONTROLS,FRAMING,SYNCHRONIZATION SYSTEMS; OPERATING PWR REQMTS ONLY PROVISIONS FOR AC OR DC; O/A DIMS AND WEIGHT 22.6 IN. LG; 19.0 IN. W; 7.0 IN. H; 50LBS; MOUNTING DATA 19 IN. RACK MTG,AND OPEN RACK PROVISIONS FOR KB; End Item Identification: ESA/OBS. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.