COMMUNICATIONS-APPLIED TECHNOLOGY ICRI Manual

COMMUNICATIONS - APPLIED TECHNOLOGY
1 1 2 5 0 - 1 4 Roger Bacon Drive Reston, Virginia 2 0 1 9 0 - 5 2 0 2
800-229-3925 (voice) 703-471-4428 (fax) http://www.c-at.com (internet)
Revision N
Setup and Operating Procedures
ICRITM
Incident Commanders’ Radio InterfaceTM
A Rapidly Deployable, Radio Interoperability Solution

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TABLE OF CONTENTS:
THEORY OF OPERATION ......................................................................................................................................2
PRE-OPERATIONAL ACTIVITIES........................................................................................................................1
1.0 SET-UP AND USE INSTRUCTIONS............................................................................................................2
FIGURE 1: ICRI CASE (OUTSIDE)..................................................................................................................................2
FIGURE 2: ICRI CASE (INSIDE)......................................................................................................................................2
FIGURE 3: PLACEMENT INSIDE CASE......................................................................................................................... 3
FIGURE 4: ICRI WITH OPTIONAL HANDSET..............................................................................................................3
2.0 ICRI POWER ..................................................................................................................................................4
FIGURE 5: ICRI WITH INTERNAL BATTERIES...........................................................................................................6
FIGURE 6: BATTERY INSTALLATION (DRAWING)...................................................................................................4
FIGURE 7: BATTERY CASE............................................................................................................................................4
FIGURE 8: BATTERY CASE (INTERIOR)......................................................................................................................5
FIGURE 9: BATTERY ATTACHMENT TO ICRI (VIEW 1)...........................................................................................5
FIGURE 10: BATTERY ATTACHMENT TO ICRI (VIEW 2).........................................................................................5
FIGURE 11: DC POWER SUPPLY SUBASSEMBLIES...................................................................................................7
FIGURE 12: IN-LINE PLUG ASSEMBLY........................................................................................................................ 7
FIGURE 13: ICRI WITH EXTERNAL POWER SUPPLY................................................................................................ 8
3.0 LAND MOBILE RADIO INTERFACE........................................................................................................9
FIGURE 14: RADIO WITH ICRI CABLE ATTATCHED................................................................................................9
FIGURE 15: ICRI INTERFACE JACKS AND TALK GROUP SELECTOR ...................................................................9
FIGURE 16: TWO RADIOS CONNECTED TO ICRI....................................................................................................10
FIGURE 17: JACK ASSEMBLY (DRAWING)............................................................................................................... 11
4.0 TELEPHONE, CELLULAR PHONE AND HANDSET INTERFACE ...................................................13
FIGURE 18: ACOUSTIC COUPLER...............................................................................................................................13
FIGURE 19: ACOUSTIC COUPLER TO CELLULAR PHONE..................................................................................... 13
FIGURE 21: TELEPHONE INTERFACE JACK.............................................................................................................14
FIGURE 22: TELELPHONE CONNECTOR ASSEMBLY (DRAWING) ......................................................................14
FIGURE 23: CELLULAR PHONE CONNECTOR (VIEW 1)..........................................Error! Bookmark not defined.
FIGURE 24: CELLULAR PHONE CONNECTOR (VIEW 2)......................................................................................... 15
FIGURE 25: RJ-10 JACK................................................................................................................................................. 16
FIGURE 26: RJ-10 CABLE FOR NOKIATM....................................................................................................................16
5.0 LINKING ICRIS ...........................................................................................................................................18
FIGURE 28: TWO LINKED ICRIs ..................................................................................................................................18
FIGURE 29: INTERFACE JACK..................................................................................................................................... 18
FIGURE 30: INTERFACE CONNECTOR ASSEMBLE (DRAWING) .......................................................................... 18
FIGURE 32: C-AT SUPPLIED RJ-45 CABLE..................................................................Error! Bookmark not defined.
6.0 SETUP AND OPERATION..........................................................................................................................19
FIGURE 33: FRONT PANEL........................................................................................................................................... 20
APPENDIX A: PART NUMBERS FOR ICRI, ACCESSORIES AND RADIO CABLES.................................22
APPENDIX B: ICRI CHASSIS: SET-UP INSTRUCTIONS ................................................................................24
FIGURE 34: TOP COVER OF THE ICRI........................................................................................................................ 24
APPENDIX C: CONNECTOR PIN-OUT DATA...................................................................................................25
FIGURE 35: BOTTOM OF ICRI CHASSIS..................................................................................................................... 25
APPENDIX D: PICTORIALS OF APPLICATIONS ............................................................................................26
APPENDIX E: PICTORIALS OF BOARD ADJUSTMENTS..............................................................................28
APPENDIX F: CONNECTING EXTERNAL SPEAKERS (OPTIONAL NOT STANDARD) .........................30
FIGURE 36: ICRI SPEAKER JACKS.............................................................................................................................. 30
FIGURE 37: ICRI SPEAKER CABLE CONNECTED TO SPEAKER JACKS ..............................................................30
FIGURE 38: ICRI CONNECTED TO AMPLIFIED SPEAKERS....................................................................................31

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Theory of Operation
In simplest terms, the ICRI performs two primary functions:
•Distributes audio received from one two-way radio to other radios, telephone or recording
device connected to the ICRI.
•Utilizes this same incoming audio to “key” the other radios connected to the ICRI.
This configuration of the ICRI is design to be quickly set-up, and operate for extended periods
without additional power sources or specialized support equipment.
Within each are the interconnect cables to link radios and telephones. Commercial radios---
both portable and mobile radios--- can be rapidly linked together to form radio communications
“nets” of radios that could not otherwise communicate with one another. Military radios, and
satellite “phone” and voice-over-IP devices can be linked to the 2-way radios to extend the
command and control capabilities of the personnel on-scene and at remote locations.
The ICRI will operate for at least 24 hours, with 8 “AA alkaline batteries (somewhat less in
cold weather). The ICRI can also be powered by an external battery pack, a vehicle-supplied or
other DC source, or AC.
Two, three, four, five radios can be linked together through the ICRI. Unencrypted radios can
be link in one talk group while encrypted can be linked in the second talk group. Talk group
selection is controlled by the switches about each radio “port”.
Two ICRIs can be rapidly linked together without hand tool and/or adjustments. An
interconnect cable may be part of this kit or is readily available.
A 250’ extension cable for radio interface may be supplied with this kit. The extension cable
permits a radio to be placed at this distance from the ICRI. This may useful when connecting
to a satellite antenna/radio or when a team enters a structure/tunnel. Multiple extension cable
can be connected for even greater distances .
The ICRI does not discriminate or evaluate the incoming audio so that delays are not inserted
into the audio transfer or “keying” processes. Radios, telephones and/or recording devices
connected to the ICRI are provided with the incoming essentially in real-time (an initial delay
at keying to preserve the first syllables of incoming audio as the transmitters [including wide
area, repeater-based “trunked” radio systems] are keyed up).
An ICRI contains up to six circuits that key the radios connected to the ICRI; these circuits are
commonly referred to as “VOX” or “voice-activated switches.” The ICRI uses these circuits to
perform other controlling functions as well. Only the VOX directly connected to the incoming
audio is used to key each of the other radios simultaneously (all other are temporarily disabled,
preventing a second “voice” from causing a disruption in initial voice being distributed).

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Pre-Operational Activities
Some pre-planning is necessary to ready the ICRI for use. The following should be
accounted for before placing the ICRI on-line:
1.0 Predetermine what the power source will be for the ICRI and verify that the
cable or battery pack is available.
2.0 Predetermine what brand and model of radios will be connected to the ICRI and
that an “interconnect” cable for each radio is available.
3.0 Advise agencies that they will need to supply a “spare” radio, for the radio
interoperability, that the radio supplied must be known to operate properly and
have at least one fully charged battery.
The ICRI can be powered by the internal batteries or another DC source up to 20 VDC.
The LEDs on the ICRI provide information battery status, in particular, a reliable
indication of a low voltage condition. Note that if eight “AA batteries are used, the ICRI
will continue operate to nominally for at least 2 hours after the “OK” LED is
extinguished and the “LOW” LED has lit and then extinguished (batteries will provide a
reduced duty cycle due to low quality, poor storage conditions before use, and/or low
temperature during use).
Among the possible power sources that can be used to power the ICRI are:
•12 or 24 volt vehicle battery
•Vehicle cigarette lighter
•115VAC (with an external adapter)
•BA590 “military”
•Commercial dry-cell battery (12V or greater)
•C-AT 12 volt battery pack (uses 8 “AA” batteries)
The ICRI’s internal regulated power supply is both reverse polarity protected, but it is
important to check polarity of DC supplies before connecting them to the ICRI. Note
that the ICRI power input connector information appears on the bottom of the ICRI.

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1.0 Set-up and Use Instructions
1.1. Opening the case may require relieving the partial vacuum that forms when the case has
been relocated from one altitude to another (more than 1000’). Turn the knob, show in
FIGURE 1, counter-clockwise; be sure to close the purge valve after the pressure is
released (turn clockwise) or the case will not be waterproof even with the lid latched.
FIGURE 1: ICRI CASE (OUTSIDE)
1.2. The Pelican case will appear as in FIGURE 2 with radio interface cables located in the
front recess.
FIGURE 2: ICRI CASE (INSIDE)

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1.3. Additional cutouts are provided for the (a) storage of an extra battery pack, and (b) for the
positioning of radios during ICRI operations.
1.4. A storage compartment for cables and batteries is located at the rear of the pouch. (The
internal strap prevents the ICRI from falling through the open zippered compartment.)
1.5. Abbreviated set-up instructions are printed onto the top cover of the ICRI assembly.
Connector information for radio, telephone, and power interconnect cables is printed on the
bottom of the ICRI assembly. Refer to Appendices B and C.
FIGURE 3: PLACEMENT INSIDE CASE
FIGURE 4: ICRI WITH OPTIONAL HANDSET

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2.0 ICRI POWER
2.1. To power the ICRI with the optional battery pack (8 “AA” cells), use the following
instructions. FIGURE 5,FIGURE 6, FIGURE 8, FIGURE 7 and FIGURE 9.
FIGURE 5: BATTERY INSTALLATION (DRAWING)
FIGURE 6: OPTIONAL BATTERY CASE AND ADAPTER
The battery housing is comprised of two parts; the exterior case and an internal tray.
NO TOOLS ARE NEEDED TO REMOVE THE TRAY AND REPLACE THE BATTERIES.

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2.1.1. Hold the battery housing securely in
the palm of the hand with metal
battery terminal plate facing up. Push
firmly on the center of the battery
terminal plate, until the battery tray is
released.
2.1.2. Remove old batteries and discard
properly.
2.1.3. Replace the 8 "AA” alkaline batteries,
observingpolarity markingswithin the
tray.
Note: There is a “key” tab on the side of the
tray and a “keyway” inside of case.
2.1.4. To reinsert the tray, make sure the
tray’s key goes in the matching slot
side of the case, FIGURE6 Insert the
tray into the housing from the bottom
end of the case, pushing the tray until
it “locks” into place. FIGURE 8.
2.1.5. To reinstall the assembled battery
pack onto the adapter, align the slots
on the top of the battery pack with the
slide rails on the adapter. Slide the
battery pack onto the adaptor until it
“locks” in place and the edges of the
battery pack are aligned with the
edges of the adaptor.
FIGURE 7: BATTERY ATTACHMENT TO
ICRI (VIEW 1)
FIGURE 8: BATTERY CASE (INTERIOR)
FIGURE 9: BATTERY ATTACHMENT TO
ICRI (VIEW 2)

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2.2. The ICRI maybe configured so that 8 “AA” batteries are installed inside the ICRI housing.
The ICRI can also be powered by several forms of external power through a jack on the front
panel of the ICRI.
FIGURE 10: ICRI WITH INTERNAL BATTERIES
2.2.1. The left side of the ICRI is configured with four internal battery housings. Each housing
holds two “AA” alkaline batteries to power the ICRI. Figure 10: ICRI WITH INTERNAL
BATTERIES.
2.2.2. Open the housing, using a quarter or similar “tool” to unscrew the cap and insert the
batteries--batteries must be installed with the negative (-) terminal inserted in the housing
first.
2.2.3. Be sure that each housing cap is “locked” into place BY TURNING…….
2.2.4. After installing the batteries, verify the batteries are installed correctly by turning on the
ICRI---the GREEN LED should be lit.
Please contact C-AT for replacement caps if necessary
NOTE-1: C-AT RECOMMENDS THE USE OF NEW, ALKALINE BATTERIES, SUCH AS
DURACELLOR EVEREADY. RECHARGEABLEBATTERIES ANDTHOSEOF UNKNOWN
ORIGIN WILL NOT PROVIDE AS MANY HOURS OF CONTINUOUS USE.
NOTE-2: STORAGE OF BATTERIES IN THE ICRI FOR MORE THAN A WEEK IS
STRONGLYDISCOURGED, SINCEALEAKING BATTERYWILL TAKETHEICRI OFFINE
UNTIL IT CAN BE RETURNED TO C-AT FOR REPAIR..
NOTE-3: IT IS NOT NECESSARY TO REMOVETHE “AA”ALKALINE BATTERIESWHEN
AN EXTERNAL POWER SOURCE IS USED. INTERNAL PROTECTION IS PROVIDED.
2.3. Using an alternate DC source to power the ICRI.

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2.3.1. When powering the ICRI with an alternate DC source or through a vehicle cigarette lighter
jack, the cable assembly consists of three subassemblies: (A) the universal interconnect
cable, (B) the cigarette lighter plug/ locking in-line jack and (C) the alligator clips/locking
in-line jack. FIGURE 11 and FIGURE 12.
2.3.2. After selecting the DC source connect the in-line jack to the in-line plug. Note that the pins
are polarized and the connection is made so that the jack’s locking “blades” slide between
the “blades” on the plug and the body of the plug.
2.3.3. Connect the assembled cable to the external DC source.
2.3.4. Connect the adapter’s plug to the jack labeled DC INPUT.
Note: Align the plug’s “key” with the jack’s “keyway” before attempting to insert the plug.
2.3.5. To remove the plug, hold the fluted part of the plug’s barrel and pull straight out.
2.3.6. To separate the in-line socket, gently lift one of the blades from the plug so that the locking
mechanism is released. Then pull the plug and socket apart.
FIGURE 11: DC POWER SUPPLY SUBASSEMBLIES
FIGURE 12: IN-LINE PLUG ASSEMBLY

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2.4. Using an AC source to power the ICRI.
2.4.1. This power supply consists of two parts: (A) the three-prong AC power cable and (B) an AC
to DC converter with an interconnect cable, FIGURE 13.
Note: The AC supply must not be used where the cables or converter can become wet.
2.4.2. Connect the power cord to the converter and to the DC source (110-120V, 60Hz).
2.4.3. Connect the adapter’s plug to the jack labeled DC INPUT.
Note: Align the plug’s “key” with the jack’s “keyway” before attempting to insert the plug.
2.4.4. To remove the plug, hold the fluted part of the plug’s barrel and pull straight out.
FIGURE 13: ICRI WITH EXTERNAL POWER SUPPLY

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3.0 Land Mobile Radio Interface
NOTE: Radio interconnect cables are generally specific to a radio brand and model, although some
manufacturer’s use the same connector for several radio models.
Interconnect cables provided by C-AT have a seven digit part number label on the cable.
3.1. Install the radio-end of the ICRI
interconnect cable onto the radio, as
you would install any radio accessory
(i.e.: a shoulder speaker /
microphone).
3.1.1. Tightening any locking screws is
optional; but it is important that the
connector be firmly seated against the
radio so that good electrical contact is
made.
3.1.2. FIGURE 15.
3.1.3. Attach the other end of the cable to
any of the LAND MOBILE RADIO
INTERFACE jacks, labeled 1, 2, 3, 4
and 5. FIGURE 14 and
3.1.4. FIGURE 16.
NOTE: The plug on the cable and the jack are
“keyed”. Be sure to align the key before
inserting the plug on to the connector or the
connection may be damaged.
FIGURE 14: ICRI INTERFACE JACKS AND
TALK GROUP SELECTOR
FIGURE 15: RADIO WITH ICRI CABLE
ATTATCHED

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FIGURE 16: TWO RADIOS CONNECTED TO
ICRI

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3.1.5. After the plug is fully seated on the jack, the locking ring on the plug should be turned
clockwise until the ring cannot be turned further. FIGURE 17.
FIGURE 17: JACK ASSEMBLY (DRAWING)
3.1.6. To remove the connector for cable storage, push inward on the locking ring and turn the ring
counter clockwise to release the locking mechanism. Then pull the connector straight out of
the jack. Hold the chrome barrel of the connector rather than the cable.

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3.2. Setting the radio to transmit through
the ICRI
3.2.1. Set the audio level on each connected
radios to mid position.
3.2.2. Set the radio to the desired channel.
3.2.3. Set the talk group switch
3.2.3.1. Up: Talk Group (TG) One
3.2.3.2. Down: TG Two
3.2.3.3. Center: no TG connection
3.2.4. Because the ICRI is connected to the
radio via the speaker jack, the audio
path on the attached radio is disrupted.
You will be unable to hear or speak
through that radio. If you can hear or
talk through the radio, the cable may
not be properly attached to your radio.
3.2.5. The LED directly above the radio will
light as audio is transmitted from the
radio through the ICRI.
3.3. If the users are having difficulty
transmitting between disparate
radios/channels, use the local handset
to test the audio.
3.3.1. Connect the local handset to the jack
on the front of the ICRI labeled,
HANDSET. The jack on the handset
is similar to those provided for the
radio cables. The handset connector
contains more pins and is designed to
be the only cable used in the
HANDSET jack.
3.3.2. After connecting the handset, set the
volume knob to mid position, set the
talk group switches (located directly
above the corresponding radio
connection) to the same position as the
other radios being used.
3.3.3. Depress the P-T-T bar on the inside of
the handset to speak. The LEDs
directly above the radio ports in use
should light. If they remain solidly lit,
turn down the volume. If the LEDs do
not light:
3.3.3.1. Slowly increase the volume
settings.
3.3.3.2. Check to make sure the
cable is solidly connected to
the radio and the ICRI.
3.3.3.3. Make certain the radio has a
charged battery.
3.3.3.4. Check if the radio can
function normally with a
speaker mic attached.
FIGURE 18: HANDSET INTERFACE JACK

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4.0 OPTIONAL SATPHONE, LAND-LINE TELEPHONE, CELLULAR
PHONE INTERFACE
NOTE: If a land-line, cellular telephone or
satellite telephone will be linked through the
ICRI to the 2-way radios, the “acoustic
coupler” interconnect cable (part number
179.0650) can be used.
If a cellular telephone with a 2.5mm
“headset” jack will be linked through the
ICRI to the 2-way radios, an interconnect
cable (part number 179.0672) with a 2.5mm
plug can be used.
4.1. Using the acoustic coupler.
4.1.1. The acoustic coupler, FIGURE 19, is
installed on a telephone handset or
cellular telephone by positioning the
transducers over the speaker and
microphone of the telephone.
4.1.2. FIGURE 20 and
4.1.3. FIGURE 21.
4.1.4. Position the BLACK pad directly over
the speaker (labeled TO EARPIECE
on its cable) and secure by stretching
the elastic strap over the handset/cell
phone.
4.1.5. Position the RED pad directly over the
microphone (labeled TO MOUTH-
PIECE on its cable) and secure by
stretching the elastic strap over the
handset/cell phone. Based on the
design of the cellular telephone, to
place an out-going call may require
moving the transducers in order to
access the cell phone’s keypad.
FIGURE 19: ACOUSTIC COUPLER
FIGURE 20: ACOUSTIC COUPLER TO
CELLULAR PHONE
4.1.6. Lastly, plug into ICRI at jack labeled
“Telephone Interface (Coupler)”,
FIGURE 22.
NOTE: The plug on the cable and the jack are
“keyed”. Be sure to align the key before
inserting the plug on to the connector or the
connection may be damaged.
4.1.7. After the plug is fully seated on the
jack, the locking ring on the plug
should be turned clockwise until the
ring cannot be turned further.
FIGURE 23.
4.1.8. Set telephone’s earphone audio to a
mid-level setting following the
telephone’s instructions.
4.1.9. After the interconnect cable from the
ICRI is connected to the telephone

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handset, a dial tone should be heard in
the earphones of the portable radio
and in the earpiece of the "local"
handset.
4.1.10. Dial the telephone number of another
telephone.
FIGURE 21: ACOUSTIC COUPLER TO
CORDED PHONE
FIGURE 22: TELEPHONE INTERFACE JACK
4.1.11. When the called party answers, use
the portable radio's throat mic or a
headset and begin to converse with
called party.
4.1.12. To remove the connector for cable
storage, push inward on the locking
ring and turn the ring counter
clockwise to release the locking
mechanism. Then pull the connector
straight out of the jack. Hold the
chrome barrel of the connector rather
than the cable.
FIGURE 23: TELELPHONE CONNECTOR ASSEMBLY (DRAWING)

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4.2. Using a cellular telephone.
4.2.1. When connecting to a cellular
telephone connect the small, single
shaft connector to the headset jack
on the cellular telephone. Be sure it
is firmly seated in the telephone.
Error! Reference source not found.
and FIGURE25: CELLULAR PHONE
CONNECTOR (VIEW 2)
4.2.2. . Plug into ICRI at jack labeled
“Telephone Interface (Coupler)”,
FIGURE 22.
4.2.3. When connecting to a cellular
telephone connect the small, single
shaft connector to the headset jack
on the cellular telephone. Be sure it
is firmly seated in the telephone.
Error! Reference source not found.
and FIGURE25: CELLULAR PHONE
CONNECTOR (VIEW 2)
4.2.4. . Plug into ICRI at jack labeled
“Telephone Interface (Coupler)”,
FIGURE 22.
NOTE: The plug on the cable and the jack
are “keyed”. Be sure to align the key before
inserting the plug on to the connector or the
connection may be damaged.
4.2.5. After the plug is fully seated on the
jack, the locking ring on the plug
should be turned clockwise until the
ring cannot be turned further.
FIGURE 23.
4.2.6. Set telephone’s earphone audio to a
mid-level setting following the
telephone’s instructions.
4.2.7. After the interconnect cable from the
repeater is connected to the
telephone handset, a dial tone should
be heard in the earphones of the
portable radio and in the earpiece of
the "local" handset.
4.2.8. Dial the telephone number of another
telephone.
4.2.9. When the called party answers, use the
portable radio's throat mic or a headset
and begin to converse with called party.
4.2.10. To remove the connector for cable
storage, push inward on the locking ring
and turn the ring counter clockwise to
release the locking mechanism. Then
pull the connector straight out of the
jack. Hold the chrome barrel of the
connector rather than the cable.
FIGURE 24: CELLULAR PHONE CONNECTOR
(VIEW 1)
FIGURE 25: CELLULAR PHONE CONNECTOR
(VIEW 2)

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4.3. Using the local handset.
4.3.1. This handset can be used as a local
incident command radio or a
troubleshooting device. Up to 250’
of cable maybe added to the cable
length. Then handset maybe replace
with a C-AT provided headset.
4.3.2. The handset microphone is enabled
when the push-to-talk bar in the
center of the handset is depressed
and held down.
4.3.3. The audio level to the handset
speaker can be adjusted by the
rotating the volume knob above the
jack. Counterclockwise decreases
the audio level, and clockwise
increases the listening level.
FIGURE 26: HEADET ON CABLE REEL
4.4. ICRI phone link in optional (RJ-10
connection)
4.4.1. The ICRI can be configured with an
optional RJ-10 jack built into the
unit. This jack will provide the user
the ability connect a standard
telephone handset without using the
standard telephone port on the front
of the ICRI.
FIGURE 27: RJ-10 JACK
NOTE: The RJ-10 jack and the telephone
interface jack on the front of the unit will not
function simultaneously. Use only one at a
time.
4.4.2. To use the RJ-10 jack with a land-line,
on your standard phone, disconnect the
cable from the handset of the phone
while leaving it connected to the base.
Plug the cable directly into the RJ-10
jack on the side of the ICRI.
FIGURE 28: RJ-10 CABLE FOR NOKIATM

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4.4.3. When connecting a phone with a
2.5mm connection or a NokiaTM
brand connector, use the C-AT
supplied cable with the appropriate
2.5, (or NokiaTM) connector and RJ-
10 connector.
4.5. Using a NextelTM phone in
DirectConnectTM mode.
4.5.1. When connecting a NextelTM
connect the phone as you would an
L-M-R.
4.5.2. Install the radio-end of the ICRI
interconnect cable onto the
accessory jackat the bottom of the
phone, as you would install any
accessory (i.e.: a shoulder speaker /
microphone)
FIGURE 29: CONNECT TO NEXTELTM DIRECT
CONNECTTM
4.5.3. Attach the other end of the cable to any
of the LAND MOBILE RADIO
INTERFACE jacks.
NOTE: The Nextel speaker and mic will be
disabled while the phone is connected to the
ICRI.