Telebyte Products » Short Haul Modems / Line Drivers » 78X Series » Specifications

Model 78X Specifications

Electrical Interface-Model 780/781- T1
Transmission Rate: 1,544 kbps
Line Code: Supports both AMI and B8ZS
DS-1 Output Signal: Conforms to ITU-T G.703
Line Build-out: Switch selectable from 0dB to -22.5 dB

Electrical Interface-Model 782/783- E1
Transmission Rate: 2,048 kbps
Line Code: HDB3
Line Impedance: Supports 120 Ohm balanced and 75 Ohm coax via adapter
I/O Ports: Conforms to ITU-T G.703
Line Build-out: Switch selectable, 4 settings, 12 dB to 43 dB
Connectors: DB15, RJ-45 and Terminal Block

Optical Interface
Multi-Mode-Models 780/782
Connectors: ST
Cable: 62.5/125 um multi-mode
Wavelength: 850 nm
Power Budget: 15 dB
Fiber Distance: 3.5 km
Single-Mode-Models 781/783
Connectors: ST standard, FC for Model 784/785
Cable: 9/125 um single-mode
Wavelength: 1300 nm
Power Budget: 10 dB for ST, 14.8 dB for FC
Fiber Distance: 16 km for ST, 29 km for FC

Diagnostic Capability
Analog Loopback, Local Loopback, Remote Loopback, Remote Test- All Switch selectable
Dual Loopback- Switch selectable
Insert Bipolar Violations- Switch selectable
Jitter Settings-Switch selectable for Transmit and Receive

Indicators: Seven LED's

Alarm Functions
Power Failure: The card cage provides both visual and audible alarms for a power failure. The standalone unit has a Power On LED.
Electrical Signal Loss: Copper Active LED goes off in alarm condition. Activates visual and audible alarms in card cage.
Optical Signal Loss: Fiber Active LED goes off in alarm condition. Activates visual and audible alarms in card cage.
Relay Contact: Standalone and card cage provides a dry contact closure for alarm, Form A. For 78X series the alarm contacts appear on Pins X and Y of DB-15 connector.

Standalone: 110 Volts, 60Hz or 220 Volts, 50Hz as ordered
Card Cage: 110/220 universal input or -48 Volts DC as ordered

Standalone: 7"W(178mm) x 1.5"H(38mm) x 5.5"D(140mm)
Card Cage: 7"H(178mm) x 19"W(482mm) x 18"D(457mm)

Temperature: All models operate over the range of 0°C to +50°C
Humidity: 5% to 95% RH, no condensation

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