The DLC170AD converts analog video and audio to SDI (SMPTE 259M) and provides optical transport. Used with the DLC170DA, the design insures full TV-1 RS250-C “short haul” analog performance over a true SMPTE 259M SD-SDI optical transport link.

The DLC170AD uses advanced high performance 12-bit video processing with adaptive 3D comb filters to convert NTSC-M /PAL-B/G analog composite video to ITU-R BT.601/656 compliant, 525 or 625 line, 4:2:2 component digital video. Four channels of analog audio are converted to 24-bit digital signals and sampled at 48 kHz and then embedded into the digital video per SMPTE 272M for a total of 4 analog channels. The audio can be inserted into any one of the four groups.

Using the backplane to provide jumper free connections, additional audio channel groups can be added by cascading the DLC170AD digital output to one or more DLC150E audio embedders. An SFP installed into the final module provides the optical output of the combined signals.

A front panel monitor jack can be selected to output either analog or digital video. When set to analog, the incoming analog video can be checked for signal level and quality using conventional analog video equipment. When set to digital, the converted video in 270Mb/s SDI format with embedded audio can be checked using digital video test equipment. The DLC170AD can be easily managed using DigiLink’s DL-Manager Element Management System

Analog Video to SDI Conversion

Output format
SMPTE 259M via optical interface or backplane
Input format composite video
Input amplitude
1.0 V p-p nominal
Input gain range
± 3 dB (1)
Input common mode range
±10 V
Input common mode rejection (0 to 5.5 MHz)
>30 dB
Input impedance
75ohm or Hi-Z
Input return loss (0 to 5.5 MHz)
>30 dB, 75ohm
Freq amplitude response
NTSC to 4.5 MHz <0.10 dB
NTSC to 5.0 MHz <0.10 dB
PAL to 4.8 MHz <0.10 dB
PAL to 6.0 MHz <0.10 dB
Differential gain
Differential phase
<0.7 degrees
Line time distortion
Chroma-luma gain
Chroma-luma delay
<5 nS
Signal to noise, weighted


>67 dB

Analog Audio to AES and Embed (6)

4 (2)
Balanced Analog
Input impedance
600ohm or >100Kohm
Input common mode range
Input common mode rejection
>60 dB
Nominal (test) level
18 dBm (3)
Maximum level (0 dBFS clipping)
+10 to +24 dBm (4)
Insertion gain
±0.25 dB (5)
Freq amplitude response (20 Hz to 20 kHz)
±0.3 dB
THD+N (20-20k @ +18 dBm)
SNR (weighted)
>95 dBA
Crosstalk @10kHz
70 dB
Audio to video lead/lag
<2 ms
(1) Automatic or manual control.
(2) Specifications are with 48 kHz, 24-bit audio.
(3) Nominal level is +20 dBm for 0 dBFS (clipping) with performance specifications based on a +18 dBm test level.
(4) User selectable maximum (0 dBFS) level in eight 2 dB steps.
(5) Each end set to the same nominal 0 dBFS level.
(6) Analog specifications based on end-to-end performance with DLC170DA


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


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

Optical Interface

Artel Video SFP
See SFP Specification

Regulatory Conformance

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

Single card composite video and analog audio to SDI conversion with optical transmitter (electrical to optical) Convert composite (NTSC/PAL) to SDI (SMPTE 259M)

  • Analog composite 75ohm video input BNC
  • Automatic NTSC-M / PAL-B/G format detection
  • 12-bit video composite to 10-bit component digital processing
  • Advanced, adaptive 3D comb filter
  • Comprehensive VBI data handling
  • SMPTE 259M SD-SDI 270Mb/s output
  • Automatic and manual gain and equalization (100 meters)

Convert analog audio to AES and embed into SDI

  • Balanced 600ohm analog audio inputs (4)
  • SMPTE 272M 24-bit, 48 kHz audio embedding

Use with DLC170DA for optical transport of analog video and audio

  • Exceeds TV-1 and ANSI T1.502 “short haul” specification

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)

Interoperates with

  • Other DigiLink modules
  • DigiLink 1220/2701 (SDI mode)
  • Other non-scrambled or non-dithered SDI optical transmitters and receivers

Multiple monitoring options

  • Front panel monitor (mini 75ohm SMB) selectable between:
    • NTSC or PAL (pre-conversion)
    • SDI (Post-conversion)
  • Front and rear panel status LEDs

Remote management via DL-Manager

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

Quick Start Guide