Rane | NM 1 | Data Sheet | Rane NM 1 Network Mic Preamp Data Sheet

Rane NM 1 Network Mic Preamp Data Sheet
DATA SHEET
NM 1
NETWORK MIC PREAMP
General Description
The NM 1 Network Mic Preamp is a very versatile single channel CobraNet I/O box that finds use in many applications. The
NM 1 presents matchless features in a compact, reliable, easy
to install and maintain package. It has a single studio-grade
microphone input with +48 volt phantom power, and a single
amplifier output for connection to an external loudspeaker. The
microphone signal can be transmitted over CobraNet and the
amplifier input can be driven by any CobraNet audio channel.
The NM 1 design is based on the Cirrus Logic CS18101 CobraNet chip and CM-2 reference design including the secondary
CobraNet port for data and power supply redundancy (more on
this later). It also has logic I/O on a DB-15 connector for reading external switches and driving indicator LEDs so it can be
connected to a custom switch panel to implement microphone
enable, busy indication and similar functions.
The feature that adds the most versatility to the NM 1 is
Power Over Ethernet (PoE). It is fully compliant with the IEEE
802.3af standard as a Powered Device (PD). This means it’s powered through the CAT 5 cable that connects it to an Ethernet
switch. Of course, the Ethernet switch used must comply with
the 802.3af standard as Power Supply Equipment (PSE); these
switches are available from all the major Ethernet equipment
manufacturers.
Think about this: the NM 1 does not need a power outlet
close by. No AC line voltage wiring. No additional electrical box
in the wall. No wall wart, batteries, solar panel, pedals or water
wheel. The only wiring needed is the data cable back to the Ethernet switch and the local analog audio, making planning and
installation much easier and much less expensive.
Rane’s engineers have designed the NM 1 to have a redundant PoE supply along with the redundant data connections. It
can be powered from either Ethernet port independent of which
one carries the CobraNet data, so an independently redundant
power system comes along with the redundant data system with
no redundant effort. Switching between ports for PoE is almost
seamless and audio interruption is minimal. If the primary port
fails the secondary port takes over very quickly, typically 10 ms,
without loss of programmed settings.
All parameters are controllable via standard SNMP messages
including microphone gain and muting, amplifier output level
and muting, and CobraNet Audio channel and Bundle assignments. Four exterior switches assign the NM 1 MIB’s SysName
variable to uniquely identify each unit on the network.
All NM 1 audio and data connectors are metal with locking, annular-ring shields for maximum durability, security and
immunity from electromagnetic interference, be it radio, static
or legislative hot airwaves. And all this fits in a very rugged (but
good looking) extruded aluminum box.
Features
•
•
•
•
Power Over Ethernet (PoE) with built-in redundancy.
Audio over CobraNet.
Dual CobraNet interfaces for hardware redundancy.
Microphone Preamp with 48V phantom power.
•
•
•
•
•
SNMP Software-controlled preamp gain.
Audio power amplifier for monitor loudspeaker.
Switch/LED interface.
Switch selectable address.
All connectors are metal with captive features.
Data Sheet - 1
NM 1
NETWORK MIC PREAMP
Units
XLR
48V
100 Hz to 20 kHz
0.01
-128
60
150
4600
10 – 65
-60
+0/-2
max
typ
typ
typ
typ
+1
min
VDC
dB
%
dBu
dB
Ω
Ω
dB
dB
¼" TRS
1
6
4
0.25
max
max
min
typ
watt
watt
Ω
%
37-57
FCC, CULAUS
1.85" H x 7.25" W x 4.95" D
6.8 oz
3.6" H x 11.75" W x 7.2" D
2 lb
VDC
Conditions / Comments
Neutrik NC3FBH1 or similar
IEC 61938 P48
-10 dBu, 1 kHz, A-weighted
A-weighted. 150 Ω source, Gain=30
10 – 20 kHz
150 – 600 Ω
pin 2 or 3 to pin 1
software controlled, 1 dB increments
attenuation at 1 kHz
6.3 mm with metal bushing
into 8Ω, pink noise HPF @ 100 Hz
into 8Ω, pink noise HPF @ 100 Hz, CF = 15 dB
8Ω, ½ watt, 1 kHz, 20 kHz BW
CS4272
350 mA maximum per IEE802.3af
4.7 x 18.5 x 12.6 cm
193 grams
9.2 x 29.9 x 18.3 cm
907 grams
In Use / Conductor
Link / Activity
4
45
23
3
SysName
01
EF
2
45
23
89
67
CD
AB
01
45
23
1
NM 1
Rane Corp.
Made in U.S.A.
MIC INPUT
01
SPEAKER
MIC INPUT
CD
AB
SPEAKER
89
67
EF
Rear
EF
45
23
89
67
CD
AB
SWITCHES / LIGHTS
Front
SWITCHES / LIGHTS
Data Sheet - 2
CD
AB
COBRANET
SECONDARY
Link / Activity
In Use / Conductor
COBRANET
SECONDARY
Link / Activity
In Use / Conductor
89
67
01
COBRANET
PRIMARY
Link / Activity
In Use / Conductor
COBRANET
PRIMARY
R
Limit
COMMERCIAL AUDIO
EQUIPMENT 24TJ
Specification
EF
Parameter
Microphone Input:
.....Connector
.....Phantom Power
.....Frequency Response
.....THD + Noise
.....EIN
.....CMRR
.....Source Impedance
.....Input Impedance
.....Gain
.....Mute
Amplifier Output:
.....Connector
.....Average Power
.....Peak Power
.....Load
.....THD+N
Codec: Converters
Power Supply: PoE
Unit: Conformity
Unit: Size
.....Weight
Shipping: Size
.....Weight
NM 1
NETWORK MIC PREAMP
Block Diagram
48V
PHANTOM
POWER
TX
BUNDLE
1/4”
SPEAKER
OUTPUT
EMI
FILTER
AMP
FIXED
32 dB
GAIN
RX
BUNDLE
67
89
BCD
89
01
23
EF
01
EF
45
23
4
3
2
SYSNAME
SWITCHES
1
01
DB-15
LOGIC I/O
LOGIC
(SEE DIAGRAM)
POWER
SECONDARY
89
BCD
67
A
MAC/
PHY
45
COBRANET
CHIP
CS18101
89
BCD
(PoE)
67
A
POWER
OVER
ETHERNET
MAC/
PHY
EF
23
BCD
45
67
A
PRIMARY
26.5 dB
PAD
D/A
A
GAIN &
MUTE
A/D
45
1
MIC
PRE
23
EMI
FILTER
01
3
2
EF
MIC
INPUT
Logic Diagram
Pin 2
Cough
Button
Internal pull-up,
debounce and
ESD protection.
Pin 12
SNMP: cough (read-only)
SNMP: coughDisable (read-write)
*
*
SNMP: talkToggle (read-write)
SNMP: talk
(read)
Flip-Flop
Toggle
Pin 1
Talk
Button
Internal pull-up,
debounce and
ESD protection.
Q
Toggle
SNMP: microphoneMute
(read-only)
1
2
3
Pin 11
SNMP: talk (write)
0 = clear flip-flop
1 = set flip-flop
“edge-triggered”
*
Pin 4
Override
Button
Internal pull-up,
debounce and
ESD protection.
*
SNMP: overrideDisable
(read-write)
1
2
3
Pin 14
SNMP: override (read-only)
*
*
Flip-Flop
SNMP: privateModeToggle (read-write)
Pin 5
Privacy
Button
Internal pull-up,
debounce and
ESD protection.
*
*Ground pins on the DB-15
connector are 6, 7, 8, 9, &10.
Toggle
Toggle
Pin 15
Q
SNMP: privateMode (read)
SNMP: privateMode (write)
0 = clear flip-flop
1 = set flip-flop
“edge-triggered”
*
Pins 3 & 13 on the DB-15
connector are no-connects.
See the MIB for
explanation of variables.
Data Sheet - 3
NM 1
NETWORK MIC PREAMP
NM 1 Software Overview
The NM 1 hardware ships with Rane’s NM 1 Search and
Control software for Windows XP, Vista and 7 (32-bit only).
The Search software polls a network for all connected CobraNet
devices and displays their System Name (sysName), IP Address
and MAC address. While Polling you can assign them different
IP Addresses if needed. Exiting Polling mode reduces the list
of CobraNet devices to only the NM 1s. NM 1 Search is much
like Peak Audio’s Disco application, without the Bee Gees music
built in. Disco doesn’t give you much insight into what the NM
1’s capabilities and settings are unless you study the NM 1 MIB
& DB-15 logic in detail by reading the manual. We know you
avoid reading manuals since your spouse may catch you. Disco’s
advantage is its ability to view many more MIB variables than
the Rane software. So using both is typical, especially if you’re
new to the NM 1.
Once you stop the Search software’s Polling, double-clicking
on a found NM 1 opens the Control section of the software
where you can set each NM 1’s common parameters and monitor
the state of their logic input (switch) and (LED) output states.
Note that multiple instances of the Control software is supported. The NM 1 parameters adjustable from the Control dialog
are: mic gain, transmit Bundle, receive Bundle, Conductor Priority, plus the mic mute (via Talk), private mode, override enable,
cough enable and Persistence. The read-only NM 1 parameters
are also displayed for you in full living color: talk, private,
cough, and override LEDs. See the primer on logic, below.
When you install the NM 1 software, it copies the NM 1
data sheet, manual, and the NM 1 MIB and CobraNet MIB
into the default folder:
C:\Program Files\Rane
Corporation\NM 1 Software\
Get all the other
gory details in the
software’s Help file.
Note the Persist variable
setting discussed in the
help file, particularly
if you’re in a rush (and
who isn’t). We warned
you, in writing.
NM 1 IP Address and control
The IP address in the NM 1 is lost when power is disconnected,
it is not persistent. This means it would behoove you to carefully
write your SNMP control software. Most systems use either
the NM 1’s sysName variable or the MAC address to uniquely
identify each NM 1, then send it an IP address for control. Some
people use the network switch’s ability to identify which source
address packets are coming from which port/device to allocate IP
addresses. Using the sysName has an advantage when it comes to
maintenance since, were an NM 1 need replacing (or if you reconfigure the room or add or subtract NM 1s), simply setting the
hardware sysName switches correctly on the replacement NM 1
makes identification more convenient than using MAC address
or switch port. While CobraNet does not use the IP address for
audio packet delivery (it uses MAC addresses), SNMP requires
IP addresses.
NM 1 Bundles and other fun
The NM 1 transmits a single audio channel within a single
Bundle. It also receives a single audio channel in a single Bundle.
By default, the NM 1 uses Audio Channel 1 within the transmitted and received Bundles. While Bundles typically contain
up to 8 Audio Channels, by default, the NM 1 transmits only a
single Audio Channel in its Bundle. This is achieved by setting
the NM 1’s CobraNet TxSubCount variable to 1 (not 8). This
means that only a single Audio Channel is transmitted which
significantly reduces the data being transmitted on the network.
Of course, any of the NM 1 settings can be changed using standard SNMP set and get messages.
Primer on NM 1 DB-15 I/O Logic
The Talk input is permanently set up to be a momentary toggling function. Use a momentary switch, of course. Hit is once,
it mutes, hit it again, it unmutes. Lather, rinse, repeat. The corresponding Talk output permanently follows this functionality.
The Private input functions the same way Talk does, as a
permanent momentary toggle. The Private output follows this
functionality, always.
The Override input is a push-to-talk. Hit it and the mic is on.
It also overrides the Mute, so if the Mute is on, Override unmutes
it while the Override input is grounded. However, the Override
input can be ignored by setting the overrideDisable MIB value.
In other words, set the overrideDisable to 1 to cause the override
switch to have no effect on the Talk function. [Setting overrideDisable true (1) means override is disabled.] Asserting overrideDisable does not change the function of the Override LED (output).
This means you can completely customize the Override input
function and disconnect override from the audio. For example,
use the Override input for voting Yes and the override LED to
indicate a Yes vote. Or implement a page switch instead.
The Cough input functions exactly like the Override input
& output, except the Cough is a push-to-mute — or what we
affectionately call push-to-cough.
©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5000 USA TEL 425-355-6000 FAX 425-347-7757 WEB rane.com
All features & specifications subject to change without notice. 1-2014
Data Sheet - 4
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