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903-0623-00 Rev. A
Supported sonars include the Reson 81xx series, Klein, and Kongsberg EM2000 and EM3000. Inputs
and outputs may be switch configured for 50 ohm or 75 ohm input and for single ended or differential ECL
inputs. Input lines are AC-coupled, allowing the ECL input to be standard ECL, PECL, or Pseudo-ECL.
Input cabling should be chosen with the same impedance as the ECL inputs. Output lines are AC-coupled
with approximately 0.8 Vpp amplitude.
The ECL-02 card uses two separate optical wavelengths, one for each channel, typically in an uplink
configuration for both channels. (Consult Focal for other possible configurations.) Both channels may be
combined on a separate fiber than that used by the FMB-X-2.5 card or, by using CWDM wavelengths,
tapped on to the existing fiber used by the FMB-X-2.5, which requires internal or external fiber jumpers.
External access is configured for either the front panel fiber bushings or through the small panel cutouts
for passing a fiber directly through to an internal bushing. Internal jumpers, if used, are connected to
bushings on the ECL card and routed through the bottom of the rack to the FMB-X-2.5 card.
Typically, on factory installed systems, internal jumpers are routed inside the rack to connect the ECL
optical signals into the FMB-X-2.5 fiber. ECL-02 cards installed in field systems after shipment usually use
a single external fiber jumper from the FMB-X-2.5 card to the top bushing or cut-out on the ECL card, with
a second fiber leaving the bottom bushing or cut-out to carry the combined FMB-X-2.5/ECL optical
signals to the sea cable. When used in this fashion, the ECL card bypass typically adds < 2.5 dB loss to
the FMB flux budget. Dual FMB-X-2.5 systems must use internal fiber jumpers for ECL optical integration.
Table 6.1-1 below shows the switch settings for the ECL configurations. The ECL link supports data rates
from 30-150 Mbps.
Channel 1
Channel 2
Switch
Switch
SW1:1
SW6:1
SW1:2
SW6:2
SW2:1
SW7:1
SW2:2
SW7:2
SW3:1
SW8:1
SW3:2
SW8:2
SW4:1
SW5:1
SW4:2
SW5:2
SW9:1
SW11:1
SW9:2
SW11:2
SW10:1
SW12:1
SW10:2
SW12:2
CLOSED = ON, OPEN = OFF, N/A = NOT APPLICABLE
Focal Technologies Corp.
Table 6.1-1: ECL-02R/C Configuration Switch Settings
ECL-02R
SINGLE ENDED
INPUT, 75 OHM
(Reson 81XX)
(Klein, EM2000/3000)
CLOSED
OPEN
CLOSED
CLOSED
OPEN
OPEN
OPEN
OPEN
N/A
N/A
N/A
N/A
Model 903 User's Guide, FMB-X-2.5 Version
DIFFERENTIAL
SINGLE ENDED
INPUT, 50 OHM
OUTPUT, 75 OHM
(Reson 81XX)
CLOSED
OPEN
CLOSED
OPEN
OPEN
OPEN
CLOSED
CLOSED
OPEN
CLOSED
OPEN
OPEN
N/A
OPEN
N/A
OPEN
N/A
OPEN
N/A
OPEN
ECL-02C
DIFFERENTIAL
OUTPUT, 50 OHM
(Klein, EM2000/3000)
OPEN
OPEN
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
CLOSED
CLOSED
CLOSED
CLOSED
CLOSED
CLOSED
Page 6-2
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