DDS DSU/CSU 56Kbps or 64Kbps with RS232 and-or V.35

56 or 56/64 Kbps DSU/CSU with V.35 and RS-232-D Interfaces

56 or 64Kbps (56 Kbps only unit is available) Both RS-232-D and V.35 interfaces Synchronous (See our DA-56 for an Asynchronous DSU) Point-to-point or multipoint DDS service or line driver mode (line driver not available at 64 Kbps) Responds to Bell defined current reversal loop-back and non-latching loop-back Front panel loop-back switch Exceeds Telco RX attenuation specifications by more than 10 dB

The DCB DL-56/64 is a 56/64 Kbps synchronous DSU/CSU for use with DDS or equivalent digital services. The DL-56/64 complies with Bell system encoding, decoding, timing, interface and diagnostic standards. It will operate point- to-point or multipoint. The DL-56/64 has a master clock mode that allows it to be used in line driver mode over customer owned cable when operated at 56 Kbps.

The DL-56/64 uses the latest line interface technology, which exceeds digital services attenuation specifications by more than 10 dB. This translates into longer cable distances from the phone company central office to the customer premise, or longer customer owned cable runs for line driver applications.

The DL-56/64 is easy to install and operate. The few controls on the unit include the loop-back push button on the front panel, the switch to select line driver or phone company clock, speed switch, and the switch for Request to Send control for multipoint operation. The minimum number of controls and comprehensive indicators make installation and troubleshooting easy. Diagnostic aids built into the DL-56/64 include LED indicators and loop-back capabilities. The V.35 and the RS-232 interfaces are on separate connectors. Both interfaces are active simultaneously. Just plug a cable into the interface you wish to use.

The DL-56 is an ideal choice for any application requiring 56 or 64 Kbps digital service, including bridging, multiplexing and multidrop lines.

SPECIFICATIONS

Rates: 56 or 64 Kbps synchronous
Application: Point-to-point or multipoint
Facility: Dataphone Digital Service (DDS) or equivalent, Line driver mode for customer owned 4-wire circuit at 56 Kbps

Indicators (front panel)

Power, Transmit Data, Receive Data, Request to Send, Clear to Send, Data Carrier Detect, Test

Controls

Front panel push button for Bidirectional Loopback.
Side door accessible switches for master or slave clock, RTS controlled by terminal or forced on.
Responds to Telco current reversal loop-back and non-latching pattern loop-back.

Telco

Interface: DDS bipolar return to zero
Connector: 8-wire RJ-48S

Data Port

25-Pin connector

Interface: RS-232-D, V.24
Connector: DB-25 female
Timing: Synchronous

V.35 connector

Interface: V.35
Connector: M-34 female
Timing: Synchronous

Physical/Electrical

Power requirements: 120 VAC, ( 9, 12, 24, -48, 120 VDC and 240 VAC Options Available)
60 Hz, 18 Watts
10 1/4" x 9 3/4" x 2 1/4"
One pound

Rear view of DCB DL-56/64

Part Numbers

see other DCB products

Stat Mux, Statistical Multiplexer, FRAD, Routers,
Wireless, Remote Access, RS-232, modems,
SCADA, and LAN interconnection equipment