Subject: [NEXTEL-1] Re: Random Thoughts On Spectrum AndInteroperability

From: Marcel <[email-masked]>
Date: Tue, 21 Jan 2003 18:41:01 -0500

------ Original Message --------
   From: "Glenn Cascino" <[email-masked]>
Subject: Re: Random Thoughts On Spectrum AndInteroperability

 I think that some are missing the point on Interoperability.  There are two types of
Interoperability: 1)Interoperability of Equipment and2)Interoperability of Agencies There
are many ways to provide Interoperability between agencies, frequency bands, and radio
systems.  The biggest obstacle for this type of Interoperability is usually political. The
type of Interoperability that the P25 Specifications deals with is Interoperability of
Equipment.  This allows a Motorola radio to talk to an EF Johnson radio, that can talk to
a M/A COM radio, for example.  So within your own system, you could have Motorola
repeaters, EF Johnson mobiles, and Thales portables. Since Phase I of the P25 spec is C4FM
with a bandwidth of 8.1 kHz (8K10F1E), rather than 16 kHz (16K0F3E) for analog FM, about
half the required bandwidth, it is obvious that P25 does in fact address both the
Interoperability and bandwidth issues.