HFCT-5964ATG NEL [Nel Frequency Controls,inc], HFCT-5964ATG Datasheet - Page 9

• Manufacturer Part Number: HFCT-5964ATG
• Description: ATG Single Mode Laser Small Form Factor Transceivers for ATM, SONET OC-3 /SDH STM-1 Part of the Agilent METRAK family
• Manufacturer: NEL [Nel Frequency Controls,inc]

Package footprint and front panel
considerations
Agilent transceivers comply with
the circuit board “Common
Transceiver Footprint” hole
pattern defined in the current
multisource agreement which
defined the 2 x 10 package style.
This drawing is reproduced in
Figure 7 with the addition of
ANSI Y14.5M compliant
dimensioning to be used as a
guide in the mechanical layout
of your circuit board. Figure 8
shows the front panel
dimensions associated with such
a layout.
Eye Safety Circuit
For an optical transmitter
device to be eye-safe in the event
of a single fault failure, the
transmitter must either
maintain eye-safe operation or
be disabled.
The HFCT-5964TL/TG/NL/NG/
ATL/ATG is intrinsically eye
safe and does not require shut
down circuitry.
Signal Detect
The Signal Detect circuit
provides a de-asserted output
signal when the optical link is
broken (or when the remote
transmitter is OFF). The Signal
Detect threshold is set to
transition from a high to low
state between the minimum
receiver input optical power and
-45 dBm avg. input optical
power indicating a definite
optical fault (e.g. unplugged
connector for the receiver or
transmitter, broken fiber, or
failed far-end transmitter or
data source). The Signal Detect
does not detect receiver data
error or error-rate. Data errors
can be determined by signal
processing offered by upstream
PHY ICs.
Electromagnetic Interference (EMI)
One of a circuit board designer’s
foremost concerns is the control
of electromagnetic emissions
9
Figure 7. Recommended Board Layout Hole Pattern
from electronic equipment.
Success in controlling generated
Electromagnetic Interference
(EMI) enables the designer to
pass a governmental agency’s
EMI regulatory standard and
more importantly, it reduces the
possibility of interference to
neighboring equipment. Agilent
has designed the HFCT-5964TL/
TG/NL/NG/ATL/ATG to provide
excellent EMI performance. The
EMI performance of a chassis is
dependent on physical design
and features which help improve
EMI suppression. Agilent
encourages using standard RF
suppression practices and
avoiding poorly EMI-sealed
enclosures.
Agilent’s OC-3 LC transceivers
(HFCT-5964TL/TG/NL/NG/ATL/
ATG) have nose shields which
provide a convenient chassis
(0.299)
DIMENSIONS IN MILLIMETERS (INCHES)
NOTES:
1. THIS FIGURE DESCRIBES THE RECOMMENDED CIRCUIT BOARD LAYOUT FOR THE SFF TRANSCEIVER.
2. THE HATCHED AREAS ARE KEEP-OUT AREAS RESERVED FOR HOUSING STANDOFFS. NO METAL TRACES OR
3. 2 x 10 TRANSCEIVER MODULE REQUIRES 26 PCB HOLES (20 I/O PINS, 2 SOLDER POSTS AND 4 PACKAGE
4. THE MOUNTING STUDS SHOULD BE SOLDERED TO CHASSIS GROUND FOR MECHANICAL INTEGRITY AND TO
5. HOLES FOR HOUSING LEADS MUST BE TIED TO SIGNAL GROUND.
(0.525)
13.34
7.59
GROUND CONNECTION IN KEEP-OUT AREAS.
GROUNDING TABS).
PACKAGE GROUNDING TABS SHOULD BE CONNECTED TO SIGNAL GROUND.
ENSURE FOOTPRINT COMPATIBILITY WITH OTHER SFF TRANSCEIVERS.
2 x Ø 2.29 MAX.
(0.118)
3
(0.09)
(0.055 ±0.004)
2 x Ø 1.4 ±0.1
(0.236)
(0.118)
6
3
(0.28)
7.11
(0.35)
8.89
(0.18)
4.57
(0.055 ±0.004)
2 x Ø 1.4 ±0.1
9 x 1.78
(0.07)
(0.63)
connection to the nose of the
transceiver. This nose shield
improves system EMI
performance by effectively
closing off the LC aperture.
Localized shielding is also
improved by tying the four metal
housing package grounding tabs
to signal ground on the PCB.
Though not obvious by
inspection, the nose shield and
metal housing are electrically
separated for customers who do
not wish to directly tie chassis
and signal grounds together.
The recommended transceiver
position, PCB layout and panel
opening for these devices are the
same, making them mechanically
drop-in compatible. Figure 8
shows the recommended
positioning of the transceivers
with respect to the PCB and
faceplate.
16
(0.121)
3.08
(0.079)
(0.14)
3.56
2
10.16
(0.4)
(0.378)
20 x Ø 0.81 ±0.1
9.59
(0.032 ±0.004)
2 x Ø 2.29
(0.09)
(0.079)
2
4 x Ø 1.4 ±0.1
(0.055 ±0.004)