JK Audio innkeeper 1x User manual

innkeeper 1x
innkeeper 1rx
Digital Hybrid
JK Audio
User Guide

2
Introduction
Innkeeper 1x and innkeeper 1rx will allow you to send and receive
audio over analog telephone lines. While this may seem like a simple
task that any telephone can do, the challenge is getting the best
quality audio from such a miserable audio path.
What is a Digital Hybrid?
A digital hybrid connects audio signals to standard analog telephone
lines without the variation in quality found with analog hybrids. The
main function of a hybrid is to bring in the caller’s voice from the phone
line as clear and clean as possible. In the real world, when you send
your voice down the telephone line it has a tendency to bleed over into
the caller’s audio. The hybrid must adapt to the phone line to properly
separate transmit and receive audio. We use a 16 bit DSP (Digital Sig-
nal Processor) to continuously monitor the phone line and audio
signals and deliver excellent separation. Our dual-convergence
algorithm can achieve excellent trans-hybrid loss, typically exceeding
50 dB, without any setup.
Ready to go?
The innkeeper 1x/1rx controls and connectors are clearly marked and
ready for operation. The innkeeper 1x comes in a desktop case and
the innkeeper 1rx has a rack mountable case. All features and opera-
tion are the same. The Features diagrams will help you pinpoint any
minor questions that you may have. If this is your first exposure to a
hybrid, we suggest that you read the entire manual to allow you to take
advantage of all these features.
Any Questions?
Before you pick up the phone... Please thumb through the rest of this
manual. You might find those deep technical questions are covered on
later pages.
1 2 3 4 5 6 7 8
9 10 11 12 13
Features—Front View
14 15 16

3
Features—Front View
1 Call Button - Press this button to answer or place a telephone call
(takes the line off-hook).
2 Drop Button - Press this button to drop (hang up) a call.
3 Send Level - Adjusts the signal that you are sending down the
telephone line.
4 Caller Level - Adjusts the level of the signal coming in from the
telephone line, going out the “Caller” jack.
5 Send > Mix Level - Adjust the level of your audio that will be sent to
the “Mix Out” jack.
6 Mix < Caller Level - Adjusts the level of caller audio that will be
sent to the “Mix Out” jack.
7 Headphones - The stereo headphone jack contains the signal that
you have created with the send> mix level and caller> mix level
controls. Both left and right channels get the same signal.
8 Mix Monitor - Adjusts the mix signal level sent to the headphone
and rear panel speaker terminals.
9 Ring LED - Flickers when you have an incoming call.
10 OH LED - Lit when you are on line with a call (off-hook).
11 Signal LEDs - Send LEDs represent the signal level going out to
the telephone line. Receive LEDs represent the signal level coming
from the phone line, after the DSP.
12 AGC - press this switch to allow the innkeeper 1x/1rx to automati-
cally adjust the gain of caller audio.
13 Caller Ducking - press this switch to lower the caller’s audio level
by 9 dB when local audio is present.
14 Presence - press this switch to boost the low end of the caller audio
signal. Presence is added to the caller audio signal only.
15 1 kHz tone generator - press switch once to send a full scale 0 dB,
maximum output level 1kHz tone down the phone line, press again
to send this signal out the Caller jack, press a third time to turn off.
16 Auto-Answer - Press this switch to enable the innkeeper to auto-
matically answer an incoming call and then disconnect after the
caller hangs up. Auto answer will occur on the first ring.

4
Features—Rear View
17 Caller Output - Male balanced XLR output contains only the
callers voice.
18 Mix Output - Male balanced XLR output contains a mix of send
and receive audio determined by the Send > Mix level and Mix <
Caller level controls.
19 Send Input - Female balanced XLR input for signals going into
the phone line. Mic or line level input.
20 Remote Control Jack - 10 pin RJ-50 modular jack for
connection to the RS-232 cable, the optional JK Audio RIU-IP
remote interface or the optional JK Audio Guest Module 1
Remote Keypad.
21 AC Power - Universal AC power input for 100-240 Volt, 50-60
Hz supply current.
22 Phone Line - Connect to a standard, single line, analog
telephone line.
23 Aux. Phone - Connect a single line analog telephone for call
setup / dialing, or producer call screening.
24 Mic / Line switch - Sets the front end sensitivity of the Send
XLR jack. Set to Mic if you intend to plug a dynamic microphone
directly to the Send jack. Set to Line if you are connecting to a
mic mixer. This device does not provide phantom power for a
condenser type microphone.
25 Remote Terminals - Screw terminals provide connections for a
small speaker, remote LEDs, tape recorder control, or console
call control switches.
22 24 25
17 18 19 20 21
23

5
Connection—Mix-Minus Setup
Number of mics
depends on mixer
Caller to any
line level input Aux Send to Send 1, Mic/Line button out (Line)
Use Main Outputs,
USB or Firewire
connectors to
send audio to
recording device,
or broadcasting
equipment inputs
For whichever input channel you have the Caller connected to, turn the
corresponding Aux control to minimum (usually hard left). All other Aux
controls should be set for what you want to send to the phone line. Each
Aux Send bus is completely separate from all other outputs, so these Aux
controls will not affect what is heard on the Main outputs or on any other
Aux buses. This Aux Send bus should be pre-fader, so you can use the
fader controls to set the levels of each channel to the main output.
Auxiliary telephone optional.
Used to dial out to set up calls.

6
Connecting Cables
Although each application will require a slightly different setup, there
are four cables that everyone can agree upon:
1 Phone Line - Connect the supplied RJ-11 phone line cable
between the jack marked “Line” and your wall jack. Be sure this
jack can support standard analog telephone operation.
2 Send Audio - Connect a microphone or mixing console output
XLR cable to the Send jack on the innkeeper. Be sure to set the
innkeeper mic/line switch to the proper position for your
application
3 Caller Audio - Connect the Caller Out jack to an input on your
mixing console.
4 Power - Connect the supplied AC power cord to the back of the
innkeeper 1x/1rx and then to an AC power outlet.
Your innkeeper 1x/1rx is now ready to take calls. You may want to
connect an auxiliary phone to the innkeeper for call setup, or you can
simply use Auto-Answer or the Call button to answer an incoming
call.
Auxiliary Telephone
Innkeeper 1x/1rx does not disconnect the auxiliary telephone when
you press the call button. You can use an auxiliary phone to place or
screen a call, and then place the call on hold. When you are ready to
take the call on innkeeper 1x/1rx, simply press the Call button. Your
telephone will automatically release the hold. If you need to take the
call back on the aux telephone, simply pick up the phone before the
innkeeper Drop button is pressed. If you would prefer the old world
way of disconnecting the aux jack when the hybrid takes the call,
please refer to the Optional Jumper Settings section below for Jump-
ers 2 and 3.
Optional Jumper Settings
On the circuit board, jumper 1 controls the incoming caller level. In
factory default closed position, caller input is normal level. In optional
open position, incoming caller level is –6dB. This does not affect
transmit level. This option is not necessary except in some cases
where the phone line is unusually “hot”. Only set this option if incom-
ing caller level is too loud.
Operation

7
Jumpers 2 and 3 control whether Phone Line jack and Phone jack
are switched or bridged. In the factory default closed position, the
jacks are bridged together. In the optional open position the jacks
are switched. This means that when the Call button is pressed any
phones connected to the phone jack of the innkeeper are disabled.
When the Drop button is pressed, the phones become active again.
Warning! The AC cable must be unplugged from the back of
the innkeeper 1x/1rx anytime the case is opened. Failure to
follow these instructions could result in injury or death.
Send Signal Level
The Send LEDs display the signal level as it goes out to the phone
line. The goal is to drive the phone line at high enough levels to
avoid phone line noise, but not so loud as to cause excessive
clipping.
Adjust the Send level control until you see occasional flashes of the
second green LED (-9dB) and very rarely any flashes of the red -3dB
peak Send LED. These flashes should occur only during loud
speech bursts. If the red LED stays lit for extended periods you can
assume that much of your speech is being clipped or distorted. In
this case you should lower the Send volume control.
Receive Signal Level
The receive LEDs display the signal coming from the phone line and
out of the DSP. The Caller level control does not change what you
see on these LEDs. Adjust the Caller level control to give you the
best signal at your equipment.
AGC
When the Automatic Gain Control is used, innkeeper 1x/1rx auto-
matically adjusts the Caller level to maintain acceptable levels be-
tween calls. In this way an unusually loud caller will be similar in
level to the unusually soft caller.
Caller Ducking
The Caller Ducking option lowers the level of the Caller’s audio by
9dB when local audio is present. This is a good way to regulate
those obnoxious callers when the talent is speaking.
Operation (continued)Operation (continued)

8
Operation (continued)
Presence
The Presence feature is a custom digital filter that boosts low
frequencies in the 120Hz to 500Hz region to compensate for losses
in the telephone network. This is a single ended algorithm that treats
only the Caller signal before it leaves the digital hybrid. You may
notice that it has more of an effect on low pitched, or deeper voices.
Auto-Answer
The Auto-Answer feature will answer incoming calls on the first ring.
When Auto-Answer is enabled, you can still take calls manually
using the Call button. When finished, you can either drop the call
manually or allow the call to Auto-Disconnect. Innkeeper 1x/1rx will
look for a CPC (calling-party-control) disconnect signal or ROH
(receiver-off-hook) message from the phone company to determine
when a call has disconnected. This can take up to a minute.
1 kHz Tone Generator
The 1 kHz tone generator is a three-state button used for setting lev-
els on your other equipment. It is not used to null the phone line.
When pressed once a full scale 0dB maximum output level signal is
sent down the phone line. This will allow you to calibrate levels at the
other end of the call. When pressed again, this same signal is sent to
the Caller output only. This will allow you to calibrate the signal level
at your console. The tone generator is disabled when pressed a third
time.
Rear Screw Terminals
1 Speaker (+) Minimum 8 ohms, 1 watt max
2 Speaker (-) Use together with terminal 1
3 Ring LED Supplies +4.3 VDC, 40 mA pulse signal during
incoming ring cycles.
4 Chassis Ground
5 OH LED Supplies +4.3 VDC, 40 mA steady signal during an
active call.
6 Call (NO) Pull this pin to ground momentarily to simulate
pressing the Call button.
7 Drop (NO) Pull this pin to ground momentarily to simulate
pressing the Drop button.
8 Reserved

9
Operation (continued)
Remote Jack
The RJ-50 type 10-pin Remote jack on the back of innkeeper 1x/1rx
is for connection to the RS-232 cable (included), the optional JK
Audio Guest Module 1 Remote Keypad or the optional JK Audio
RIU-IP interface (see Page 11).
The RS-232 cable can be connected to your other equipment to al-
low remote control of the innkeeper 1x/1rx using any of the ASCII
commands listed on Page 10.
Dry Lines
Innkeeper 1x/1rx was designed to work on standard (wet) telephone
lines as well as on custom pbx (dry) lines. Dry line installation is
always a custom configuration and requires substantial telephone
system knowledge. These installations are found in radio and
television studios for both PBX and intercom applications.
Wet lines are typical tip / ring telephone lines that carry ring voltage,
talk battery, and full duplex, balanced audio over two wires to an
analog telephone. Dry lines carry the balanced, full duplex audio but
without the ring voltage or talk battery. Innkeeper does allow dry line
operation with a few limitations:
• If talk battery is not present when the Call button is pressed,
a dry line is assumed.
• If talk battery suddenly appears during a “Dry Line” call, it
becomes a wet line call, and auto-disconnect will occur when
a disconnect signal occurs, or if talk battery disappears.
• Auto-answer does not work on a dry line.
• The aux telephone jack will not support an analog telephone
during a “Dry Line” call.
Operation (continued)

10
Serial Port Interface
innkeeper 1x/1rx includes an RS-232 interface for remote control applications.
The enclosed CN081 serial port cable connects to the Remote jack on the
back of the innkeeper 1x/1rx. The port is configured with baud rate=9600,
data bits=8, stop bits=1, parity=none, flow control=none. All commands begin
with the ‘/’ character, and will be automatically executed whenever a carriage
return ‘←’, or the next ‘/’ character is received.
The serial port accepts the following ASCII commands:
/AT or // Version Returns product series type and operational
status.
/? Help Returns command help menu to user screen.
/CF Configuration Returns product series type and option
configuration.
/ST Line Status Returns: On-hook = 0, Off-hook = 1, Ring = 2
Esc Escape key Clears / escapes current command before
execution.
/CL Line Call Control Off hook (Call)
/DR Line Drop Control Hang up (Drop)
/AGn*AGC OFF = 0 Turns AGC off
ON = 1
/DKn*Ducking OFF = 0 Turns Ducking off
ON = 1
/PRn*Presence OFF = 0 Turns Presence off
ON = 1
/AAn*Auto-Answer OFF = 0 Turn Auto-Answer off
ON = 1
/TTn*Test Tone OFF = 0 Turn test tone off
Send = 1 Transmit 1 kHz tone into
phone line
Caller = 2 Transmit 1 kHz tone to
Caller XLR
/DIs% ** Dial Digit String = “s” Take line off-hook and dial
phone number, up to 20 digits [terminated
with ‘%’]. Use a comma ‘,’ to insert a one
second pause anyplace in the digit string
(max delay=5 sec)
* = ‘n’ specifies the parameter value to be used for the command.
** = ‘s’ specifies the digit string used during manual dialing mode [up to 20
numerical digits, terminated with a ‘%’].
The previous commands request information or perform tasks. The following
unsolicited responses will inform you of changes in call state:
ONHK The line has been disconnected
OFFHK The line is off-hook
RING Incoming call

11
Optional Remote Control Devices
RIU-IP
This remote control interface was designed for use with innkeeper
1x/1rx as well as JK Audio innkeeper 2 and innkeeper 4 digital hy-
brids. This unit contains a web server which allows the user to send
and receive control data through their web browser. RIU-IP can be
connected to the user's computer NIC card for direct control, to a
switch or hub for network control, or to an Ethernet port with internet
access for control from anywhere in the world.
RIU-IP Features and Capabilities when used with innkeeper 1x:
• RJ45 Ethernet port
• RS-232 remote control port with simple ASCII protocol
• No external power required
• Indication of incoming ring per line.
• On-Hook and Off-Hook
• Confirmation of Off-Hook on On-Hook transition per line.
• Place call on hold or release hold.
• Dial (number) (line).
• Auto-Answer on/off
• Test tone start / stop per line.
• Presence on/off
• Caller Ducking on/off
• Automatic Gain Control on/off
Guest Module 1
This convenient device gives you remote access to the on-hook/off-
hook and dial features of the innkeeper 1x. The Call button will
flicker when a call comes in and will stay lit while a call is present.
When you dial out using the Guest Module 1 keypad, the tones are
sent directly down the phone line, and do not come back blasting in
your ear.
Guest Module 1 features:
• Ring and Call LED
• Call and Drop buttons
• DTMF Keypad
• Keypad disable switch
• Remote powered
Contact your JK Audio dealer for additional information on either of
these optional devices.

12
?Does the innkeeper 1x/1rx send a burst or beep down the
phone line at the beginning of the call like our current hy-
brid?
!No. Innkeeper 1x uses the actual transmit signal to evaluate
the phone line and tune its algorithm. As you begin to speak,
innkeeper 1x is hard at work canceling your voice from the
Caller Output jack. Within milliseconds your voice is reduced
into the noise floor.
?Will your innkeeper 1x/1rx provide phantom power for my
condenser microphone?
!No, our devices will not provide phantom power. If you plan to
connect your microphone directly to an innkeeper 1x, you
should use a dynamic mic.
?Are there more ASCII commands I can send through the
serial cable or can I add my own?
!The complete list of currently acceptable commands is listed
on page 10.
FAQ’s

13
Inputs
Send: Balanced Female XLR,1k ohms,
15 mV RMS (-34 dBm nom.)
Mic / Line pad switch, Line = +6 dBu max.
Outputs
Caller: Balanced Male XLR, 200 ohms,
500 mV RMS, -4 dBu nom, +12 dBu Max.
Mix Out: Balanced Male XLR, 200 ohms,
500 mV RMS, -4 dBu nom, +12 dBu Max.
Headphone: 1/4" Stereo, 8 ohms, 250 mW per channel
Speaker: Screw Terminals, 8 ohms, 1 watt
Phone Line Connector: RJ-11C
Remote Jack: RJ-50
Isolation: 1500 VAC
Ringer: 0.5B REN
Frequency Response: Telephone side 200 Hz - 3600 Hz
Power: Universal AC supply, 120-240 VAC,
50-60 Hz, 25 watts max.
Innkeeper 1x
Size: 1.75" x 7.3" x 10.5" (4.5 x 18.6 x 26.7 cm)
Weight: 4.0 Pounds
Innkeeper 1rx
Size: 1.75" x 7.3" x 19" (4.5 x 18.6 x 48.3 cm)
Weight: 5.4 Pounds
Operation (continued)Specifications

14
This equipment has been tested and found to comply with the limits
for a Class A digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own
expense.
Changes or modifications not expressly approved by JK Audio can
void the user's authority to operate the equipment.
FCC Registration
Your new JK Audio product has been registered with the Federal
Communications Commission (FCC). This product complies with
the standards in Part 68 of the FCC rules.
1. Connection and use with the nationwide telephone network
The FCC requires that you connect this telephone equipment to
the national telephone network through a USOC RJ-11C
modular telephone jack.
This equipment may not be used with Party Line Service or Coin
Telephone Lines
This equipment is hearing aid compatible.
2. Information for the telephone company
Upon request from your local telephone company, you are
required to provide the following information:
a) The "line" to which you will connect the telephone equipment
(that is, your telephone number), and
b) The telephone equipment's FCC registration number. This
can be found on the bottom of your telephone equipment,
and,
FCC Part 15 Compliance

15
FCC Registration (continued)
c) The ringer equivalence number (REN) for this equipment.
The REN is used to determine the quantity of devices which
will be connected to the telephone line. Excessive RENs on
the telephone line may result in the devices not ringing in
response to an incoming call. In most, but not all areas, the
sum of the RENs should not exceed 5.0. To be certain of the
number of devices that may be connected to the line, as
determined by the total RENs, contact the local telephone
company.
3. Repair Instructions
If it is determined that your telephone equipment is
malfunctioning, the FCC requires that it not be used and that it
be unplugged from the modular outlet until the problem has
been corrected. Repairs to this telephone equipment can only
be made by the manufacturer or its authorized agents or by
others who may be authorized by the FCC. For repair
procedures, follow the instructions outlined under the warranty
section of the manual.
4. Rights of the telephone company
If telephone equipment is causing harm to the network, the
telephone company may temporarily discontinue your
telephone service. If possible, they'll notify you before they
interrupt service. If advanced notice isn't practical, you'll be
notified as soon as possible. You'll be given the opportunity to
correct the problem, and you'll be informed of your right to file a
complaint with the FCC.
Your telephone company may make changes in its facilities,
equipment, operations or procedures that could affect the
proper functioning of your JK Audio product. If such changes
are planned, you'll be notified by your telephone company.

Warranty
Innkeeper 1x and innkeeper 1rx are covered by a 2-year
warranty to be free from defective workmanship and materials.
In the event that the innkeeper 1x or innkeeper 1rx needs repair,
you must call us to get an authorization, and then carefully pack
and ship it to us. You will pay for shipping to us and we will pay
for return back to you, UPS ground. No free repairs will be made
if the defect was caused by misuse, weather conditions, or other
cause, except for defective workmanship or materials. THERE
ARE NO EXPRESSED OR IMPLIED WARRANTIES WHICH
EXTEND BEYOND THE WARRANTY HERE MADE.
10/06
JK Audio, Inc. 1311 E 6th Street, Sandwich, IL 60548 USA
Voice: [phone] Toll Free: 800-JK-Audio Fax: [phone]
[email protected] www.jkaudio.com
Copyright © 2006 JK Audio. All Rights Reserved.