The DLC274M and DLC274D utilizes Time Division Multiplexing (TDM) to combine four independent 270Mb/s video signals into one optical channel.

Services can be any combination of 270Mb/s video signals including SDI, SDTI, and DVB-ASI. Optical regeneration or repeating is accomplished using the DLC274D which includes drop and continue capabilities, DLC103, DLC300, or any other system capable of repeating a 1.485Gb/s signal. Using industry standard 1310nm, 1550nm, CWDM, or DWDM Small Form-Factor Pluggable (SFP) optics the DLC274 enables transport of up to 160 270Mb/s circuits over a single fiber making it ideal for conserving both fiber and rack space.

The DLC274M and DLC274D modules for the DigiLink chassis are easily monitored and managed remotely via DigiLink’s DL-Manager Element Management System.


Operating temperature
0 to 50°C
Ambient storage temperature
-40 to 80°C
Relative humidity
10 to 95% (non-condensing)
Power dissipation
<7 Watts

0.8” x 5” x 10.8”
1 slot in DigiLink chassis
Optical Interface

Electrical Interface

270Mb&#47;s signal formats
– SD-SDI (SMPTE 259M-C, ITU 656)
– Others 270Mb/s services (+100ppm)
Signal polarity
Non Inverting
Input (4) BNC 75ohm (DLC274M)
Output (4) BNC 75ohm (DLC274D)
Monitor mini 75ohm SMB
Return loss
>15 dB, 5-270 MHz
Regulatory Conformance

NEBS Level 3, CSA 60950, EN60950, EN55022, FCC Part 15 (Class A), CISPR 22

Single slot card set Transport four 270Mb/s video circuits on a single optical wavelength

  • Support any combination of:
    • SD-SDI (SMPTE 259M-C, ITU 656)
    • SDTI (SMPTE 305M)
    • DVB-ASI
    • Other 270Mb/s services
  • Use with DLC170 for composite analog transport
  • Full reclocking removes jitter from SDI

Industry-standard 1.485Mb/s output

Space efficient

  • Utilizes one slot in the DigiLink chassis
  • Transports up to 16 video circuits per rack unit

Externally accessible SFP transceiver optics

  • Optical budget to 33dB
  • WDM (1310nm, 1550nm)
  • CWDM ITU G.694.2 (Channels 27-61)
  • DWDM ITU G.694.1 (Channels 21-60)

Multiple monitoring options

  • Switch selectable front panel monitor of individual channels (mini 75ohm SMB)
  • Front and rear panel status LEDs
    • Loss of video (individual channels)
    • Loss of optical input
    • Laser (SFP) fail

Remote management via DL-Manager

  • No external software required
  • HTTP or SNMPv2
  • Monitor
  • Configure
  • Upgrade firmware

Quick Start Guide
Quick Start Guide