To the venue owner – an ERRCS system is an expense with no ROI.

To the Emergency Responder – an ERRCS system is a MUST – with life safety for
responders, AND the public, depending on it.

Comba Telecom is committed to providing highly affordable,
state of the art solutions so venue owners can ensure
that First Responders get the coverage they need and deserve,
while making the cost to the venue owner as low as possible.


Comba's NEW CriticalPoint NG (Next Generation) 700MHz/800MHz BDA platform is designed for use with public safety first responders in mind. Fully compliant with the IFC and NFPA (National Fire Protection Association), CriticalPoint's BDAs are offered in 0.5W, 2W models providing wireless coverage of up to 300,000 square feet.  Similar to our award-winning first generation CriticalPoint BDAs, the NG platform will also come in Class A or Class B and will be software configurable.  What sets the NG platform apart from the previous generation:


  • Greatly improved noise factors
  • Faster ALC (automatic level control) response time that supports P25 phase 2 per timeslot
  • Up to 64 channels per band on single band models; up to 96 channels shared across bands on dual band models (maximum of 64 on individual band) (Class A)
  • Fully FCC compliant (<9dB Noise Figure) low gain mode
  • A more powerful GUI and tools for commissioning, updating and maintaining the ERCES system


Additionally, the NG system includes a new battery backup unit (BBU), sold separately. The BBU will be offered in either a 30AH, 60AH or 100AH capacity to satisfy a wide range of requirements of local ordinances. The new BBU is powered by the same Lithium iron phosphate batteries (LiFePO4) found in our current Version 2 BBU, however the chassis is 30% smaller and 20% lighter. Lithium Iron Phosphate batteries are extremely stable and have been a proven technology for decades. They are lighter in weight, have 3 times the service life of lead acid batteries, and provide better performance than typical lead acid batteries, making installation easier and needing less maintenance trips between battery replacements. The NG BBUs accomplish the reduction in size, weight, and cost by containing only the batteries; the charger and supporting controller boards are located in the NG BDA.

Next Generation (NG) BDA


0.5W / 2W BDA (NG)


Bi-directional Amplifier

• Supports P25 P1/P2, digital and conventional analog communications simultaneously

• Built-in cavity filtering to protect the unit from interference from FirstNet and other neighbor bands

• Up to 64 channels per band on single band models; up to 96 channels shared across bands on dual band models (maximum of 64 on individual band) (Class A)

• Channelized Auto Level Control (ALC) supported (Class A)

• Channelized Downlink and Uplink squelch supported (Class A)

• Uplink PA shutdown during no traffic periods to minimize noise being introduced to the network (Class A)

• Built-in mandatory isolation test to prevent BDA oscillation

• Auto shutdown with alarm upon oscillation detection

• Expandable to 700/800MHz V3/NG fiber system

• Web based GUI for intelligent configuration, SNMP supported

• Integrated Battery Charger Unit, Comba BBU V2 / BBU V3/NG supported

• License based switching between Class A or Class B, Single band or Dual band, 0.5W or 2W configurations

• NFPA / IFC / UL 2524 compliant dry contact alarms, with LED displays

• External Comba Annunciator Panel supported


Battery Backup Unit

• Optional dedicated Battery Backup Solution for BDA V3/NG platform

• Supports Lithium Iron Phosphate (LiFePO4) batteries

• Supports 12 hours backup power with 30AH battery option

• Supports 24 hours backup power with 60AH battery option

• Provides connections for EPO (Emergency Power Off) switch

• Provides AC convenience outlet inside BBU




BDA Part Numbers




Duplexer Configuration



Class A





Class A





Class A





Class A





Class A





Class A





Class B





Class B





Class B





Class B



BBU Part Numbers

Battery Type


Backup Hours


Lithium iron phosphate


>12H for 110W


Lithium iron phosphate


>24H for 110W, 12H for 220W


Lithium iron phosphate


>48H for 110W, 24H for 220W

License Part Numbers



27dBm to 33dBm upgrade license

27dBm to 33dBm upgrade license, for Single Band, Class A units


27dBm to 33dBm upgrade license, for Dual Band, Class A units


27dBm to 33dBm upgrade license, for Single Band, Class B units


27dBm to 33dBm upgrade license, for Dual Band, Class B units


Single Band to Dual Band upgrade license

Single band to Dual Band upgrade license, for 33dBm, Class A units


Single band to Dual Band upgrade license, for 33dBm, Class B units


Single band to Dual Band upgrade license, for 27dBm, Class A units

Not Available

Single band to Dual Band upgrade license, for 27dBm, Class B units


Class B to Class A upgrade license

Class B to Class A upgrade license, for 33dBm, Single Band units


Class B to Class A upgrade license, for 33dBm, Dual Band units


Class B to Class A upgrade license, for 27dBm, Single Band units


Class B to Class A upgrade license, for 27dBm, Dual Band units

How can Comba offer so much for such a low price?
Comba is a prime manufacturer – we internally design and manufacture many sub components and sub assemblies that other OEMs outsource (PCBs, PCB insertion and wave soldering, metal chassis components, key passive components, power amplifiers, etc.).

This provides Comba with much lower cost – and in addition, internal manufacturing also allows us to maintain a higher level of quality control and better control over lead times.

How does Comba CriticalPoint have such low AC power consumption?
Comba utilizes High Efficiency Linear amplifier design – linear amplifiers draw significantly less operating current than conventional amplifier designs.

How does Comba CriticalPoint have such low weight?
This is another advantage of High Efficiency Linear amplifier design – extremely low weight. It is also important to note that since the Linear amplifiers generate less heat, there is no need for cooling fans – this also contributes to lower weight.

In addition, Comba's design team puts forth great efforts to ensure that there is no "over design" of any part of the CriticalPoint products, that could result in unnecessary extra weight or cost.

If I ordered a single band version and discover that I need the other single band instead, do I need to return the original unit and re-order the correct band version?
No – the CriticalPoint single band BDAs include a license to switch from one single band to the alternate single band. No additional purchases are required.

Does upgrading to add the second band require an onsite visit?
Not necessarily – if there is network access via modem or Ethernet available, the CriticalPoint BDA upgrade license can be installed remotely.

Does making adjustments to the CriticalPoint product require an onsite visit?
Not necessarily – if there is network access via modem or Ethernet available, the CriticalPoint BDA can be commissioned, adjusted, and monitored remotely. Modem/Ethernet access and SNMP v2/v3 are fully supported.

Is special battery back up equipment required for compliance with AHJ requirements?
No – CriticalPoint will work with any standard commercially available UPS or battery backup system.

I see that the CriticalPoint BDA provides up to 32 channels for each band – can channels from one band be allocated for more than 32 channels in another band?
No – there is a maximum of 32 channels for each band deployed.

I see that the CriticalPoint BDA claims 2W of power per band? Is this true, or is the 2W shared across both bands?
The CriticalPoint BDA provides 2W of downlink power for EACH BAND independently.

Does CriticalPoint provide any built in oscillation protection?
Yes – CriticalPoint protects against oscillation in 2 ways:

First, there is a mandatory isolation test that must produce satisfactory results prior to being able to commission the BDA.

Secondly – in the event that something changes the isolation (and causes oscillation) while the BDA is in use, the CriticalPoint BDA will shut down and issue an alarm.

What is the warranty for the CriticalPoint BDA?
All Comba products have a 3 year product warranty with advanced exchange service.

What approvals or compliance ratings does the CriticalPoint product carry?
The CriticalPoint BDA is FCC, UL and IC approved – and it is fully NFPA and IFC compliant. In addition, the unit is housed in a NEMA 4X rated chassis.

Comba tests and certifies it's products through a Nationally Recognized Test Lab (NRTL) to meet the strict UL requirement standards. Click to view Comba's UL Standards Testing and Product Certification process pdf.

Does this BDA carry both analog and digital communications – and can it do so simultaneously?
As our specification sheet states – our BDA is compatible with and capable of passing analog and digital communications, and simultaneously.

How does this work: our BDA amplifies and passes RF (radio frequency) – RF can carry analog traffic, or it can carry digital packetized traffic. As stated, our BDA is simply amplifying and passing the RF - we do not read, manipulate, or modify, nor really even "see" or know, what the traffic content is.

A way to look at this: consider the BDA and the antenna infrastructure as plumbing in a home or building – all the plumbing does is carry water. The water can be hot water or cold water - or could be potable or non-potable water – the plumbing doesn't care. And in a similar fashion, our BDA does not care what the traffic content over the RF is comprised of.

So how can analog and digital, which are different, be carried simultaneously? The end devices (base station and mobile devices) operate on either analog or digital – meaning that an analog device won't even see the digital traffic, and the digital devices won't even see the analog traffic. So – both types can be mixed over the same RF path with no chance of one interfering with the other.

I am getting call quality issues with my group delay settings at 12.5KHz and 25KHz. What can be done to fix this?
In certain cases when deploying a Class A BDA in a P25 Phase I/II network environment, the typical 12.5KHz or 25KHz channel bandwidths with their higher level of group delay may cause some issues with call quality and clarity. A channel bandwidth of 12.5KHz may result in group delay figures of up to 35usec; 25KHz channel bandwidths may result in group delay figures of up to 27usec – either of which can cause call quality issues as mentioned above.

To minimize or eliminate any call quality issues resulting from using these very narrow channel bandwidths, Comba has released updated firmware for our Class A BDA devices that allows for channel bandwidths of 75KHz. Utilizing a 75KHz channel bandwidth will result in group delay figure of 15usec maximum – which is well within the tolerances required for excellent call quality on P25 Phase II networks. This updated firmware is available directly from Comba and is available on Comba's portal which you can access here: Firmware Download

How can I commission the Public Safety CriticalPoint BDA on a P25 radio system which is non-trunked (no control channels available)?
Comba Public Safety BDAs utilize control channel signal levels in P25 based trunked system networks as the means for monitoring and alarming for donor antenna malfunctions. It is rare – but there are cases where the network is NOT a trunked network; therefore, there are no control channels available for use in donor antenna monitoring and alarming. In these cases – Comba offers an easy to install/easy to use kit that includes all of the components necessary to provide the ability to monitor and alarm for donor antenna malfunction in non-trunked network applications.

These kits are available directly from Comba – following is a link to the specification sheet for the kit; the specification sheet also includes the part number and other information necessary to order the kit. Link: BIAS-T KIT FOR NON-TRUNKED RADIO SYSTEMS

CriticalPoint's BDA software report function doesn't work in a Chrome browser.
Solution: Download PDFs in Chrome

1. On your computer, open Chrome.
2. At the top right, click More Settings.
3. At the bottom, click Advanced.
4. Under "Privacy and security," click Content settings.
5. Near the bottom, click PDF documents.
6. Turn on Download PDF files instead of automatically opening them in Chrome.

Chrome will now download the generated Report.


Questions? Call 1-408-649-2638 or email This email address is being protected from spambots. You need JavaScript enabled to view it.