Dear Sir,
Good afternoon!
Regarding your questions that was sent to me yesterday, Motorola give you the technical answer is as below:
Please also kindly find the attachment
1. Frequency range for every channel of ASTRO25 (12,5 khz or 6,25 khz)
The channel bandwidth is 12.5kHz
2. Can set up how many talkgroup?
The system can be set up to 16,000 talkgroups
3. Every talkgroup can contain how many radio (ID)?
A talkgroup can contain as many as all the radios in the system.
4. Site for ASTRO there are 7 Channel every channel how many line can communicate at the same time?
In every 7-channel site, there’s 1 x control channel and 6 x traffic channels to enable radio trunking efficiency. Each traffic channel can accommodate one talkgroup call at any one time. Once the talkgroup call is completed, the channel will be automatically returned to the common pool of traffic channel for the system to re-assign to other talkgroups in the queue. No user action is required.
5. Do they have support for GPS or Internet system ?
The subscriber radios are equipped with GPS capability. The system is equipped with data capability for transmission of GPS information, however the fixed end is not equipped with the AVLS (automatic vehicle location system) application and servers. ASTRO25 narrowband system is not suitable for internet access.
6. This system can connect between site to site by fiber optic?
ASTRO system can be linked up via microwave, internet or fiber links. Our proposal is based on microwave links.
7. ASTRO25 system is Digital system by TDMA or FDMA?
Both FDMA and TDMA can be supported. In our proposal, we offered FDMA.
8. In one channel can connect with how many site?
A channel is required to service each talkgroup users within a site. If the users from the same talkgroup are spread across a few sites, a channel in each of these sites is required for the talkgroup call e.g. if there 50 users from the same talkgroup and they are spread across 9 sites, a channel in each of the 9 sites is required and the talkgroup can communicate on all the 9 sites among the 50 users. The system will automatically assigned the channel and no user action is required.
9. All 18 site (provinces) can they connect each other?
All the 18 sites are connected to the MSO (Master Switch) to network together to form one wide area nationwide radio system to allow users from one province to talk to users in another province/s.
10. Frequency range between 800 Mhz - 870 Mhz sperate for how many Analogue and how many Digital or All are Digital system?
All channels are digital. ASTRO 25 Radio can support both digital and analog communication.
Best regards,
Allen