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D448 T1 Channel Bank
PCM Carrier Systems digitally multiplex 24 or 48 Voice and Data Channels into one or two DS1-Compatible, 1.544 Mb/s data streams

T1 data streams can be transported over copper, fiber optic, radio and satellite links and are end-to-end compatible with other D1D, D2, D3 and D4 channel banks.

In Mode 3, the channel banks provide dual 24 channel asynchronous service over two independent T1 span lines at 1.544 Mb/s.

Each digroup functions totally independent of the other. One TPA unit and one Line Interface, Mode 3 (LI-3 or LI-3E), SRMU or QMJU is required per digroup.
  • Provides a wide-variety of channel unit offerings, including VF, special service, data, program channels and ISDN
  • Offers loop and DDS timing interface units
  • Available in connectorized shelves, pre-wired bays and outdoor special services housings
  • Supports data rates up to 19.2 Kb/s synchronous/asynchronous via direct RS-232C interface and up to 56 Kb/s with a V.35 interface


Multiple Configurations

The D424 and D448 connectorized shelves can be mounted in standard racks and the D448 is available in both 19" and 23" widths. The channel banks are available in pre-wired bays for office applications and in a weatherproof special services housing for outdoor installations.

D424 T1 Channel Bank

Multiple Switched Digital Data Services
  • Four-wire switched 56 data service is supported by the Dataport Unit and is compatible with all major manufacturers’ switches.
  • Two-wire switched 56 data service (such as Datapath™ is supported by D448 Datapath Extension Channel Unit and provides transport of the service beyond the basic service area.
  • ISDN is supported by a D448 Channel Unit that provides basic rate ISDN (BRI) transport of ISDN services beyond the basic service area of the ISDN-equipped switch.
Multiple Private Line Data Services
  • Dataport channel applications provide multiplexing of digital data services at 2.4, 4.8, 9.6, 19.2, 38.4, 56 and 64 Kb/s using the Office Channel Unit Dataport and the Dataport Channel Unit. These private line services are provided by a single card with secondary channel and on-board error correction.
  • Sub-rate multiplexing capability allows 5 to 20 circuits at 2.4, 4.8 or 9.6 Kb/s to be combined into a single 64 Kb/s DSO signal.
Multiple Voice Channel Types
  • Two-wire, four-wire, E&M, FXO, FXS, Gain Transfer, SF, Extended VF and PLAR
Multiple VF Program Channel Types
  • 8 and 15 KHz

Ordering Information

Part Number Width Height Depth
D424 19" (47.5 cm) 17.5" (44.5 cm) 15" (37.5 cm)
D448 19" (47.5 cm) 24.5" (61.3 cm) 12" (30.5 cm)
D448 23" (58.4 cm) 17.5" (44.5 cm) 12" (30.5 cm)

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