Multiplexer

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Ingenium, 2004.0152.001
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OBJECT TYPE: DIGITAL/SYNCHRONOUS
DATE: 1985
ARTIFACT NUMBER: 2004.0152.001

MANUFACTURER: Northern Telecom
MODEL: DE-4
LOCATION: Canada

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: channel bank
Patents: N/A
General Description: Metal & synthetic component parts.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length: 51.0 cm
Width: 30.5 cm
Height: 71.0 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Communications
Category: Telephony
Sub-Category: N/A

Manufacturer

AKA: NORTHERN TELECOM
Country: Canada
State/Province: Unknown
City: Unknown

Context

Country: Canada
State/Province: Ontario
Period: Unknown
Canada: A Canadian-based company, Northern Telecom/Nortel Networks was one of the most important manufacturers of telecommunications equipment in the world in the 1990s. This specific unit was used by Nortel Networks staff in Ottawa for testing and product development. (ref. 1)
Function: To combine digital data signals on a telecommunications channel using time division multiplexing; or reverse this process by breaking out a high capacity circuit into individual signals.
Technical: This is a digital multiplexer performing time division in a telephone central office. In time division multiplexing, several digital signals are each assigned their own recurring time slots in a data stream for transmission over a high capacity channel. At the receiving end, each signal can be broken out by assigning all data in each given time slot to its own dedicated circuit. Equipped with data ports, the DE-4 could accept a digital signal from a dedicated data line, rather than requiring data be converted to analogue at the subscriber premises using a modem, then converting it back to digital at the channel bank. (ref. 1)
Area Notes: Unknown

Details

Markings: "DE-4 CHAN BK DIGROUP A/ J7265AC- 1L4SD 0592" marked in lower front left corner. "CB DIGRP A: TATM TAC 80-00/ CD DIGRP B: TATM TAC 81-00" printed on white decal on centre front of unit. "nt/ northern/ telecom/ MADE IN/ CANADA/ PO698868" cast in raised print on metal top.
Missing: Unknown. According to curator, this unit is not operable.
Finish: Goldtone metal rack; off-white and brown synthetic fronts on modular electronic components; grey cast metal panel on top surface; clear, flexible plexiglass (?) cover in 2 pieces on back; individual/small bundles of wires have colour-coded coverings; light grey synthetic covering on larger bundles/cables.
Decoration: N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Northern Telecom, Multiplexer, circa 1985, Artifact no. 2004.0152, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2004.0152.001/

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