: IS system product
IP : IP unit
Telephone network
LAN (IP network)
IS-IPMV
IP
IP
PC master station (IS-SOFT)
IP 
PS-2420/D/UL/S*2
or
PoE
| IS-IPDV | | IP | IS-IPC*1 | | |
| | | | |
| /IS-IPDVF | | | | |
| | | | | | IS-PU-UL |
| | Local system | | | | or |
| | | | | IS-PU-S |
| PS-2420/D/UL/S*2 | | | IS-RCU | (Max. 1) | |
| or | | | |
| PA speaker | PA amplifier | | | |
| PoE | | | |
| | | | | IS-PU-UL |
| | | | | |
| | | | | | or |
PT | AC | | | (Max. 30) | IS-SS | IS-PU-S |
| transformer | | | | | |
EL-12S
Electric door strike
8Ω speaker
*2: Do not use PS-2420S in Europe.
Maximum number of each unit connectable to a "local system" and a site of "standard (IP) system"
| | Category | Model name | Type | Max. number |
| | Local system | Standard (IP) system |
| | | | |
| | | IS-CCU | Central control unit | 1 | 8*4 |
| | Control unit | IS-SCU | Add-on control unit | 2 | 16 |
| | | IS-RCU | Room sub control unit | 4 | 32 |
| Local | Master station | IS-MV | Color monitor master station | 20 | 160 |
| | IS-DV | Vandal-resistant video door station (surface-mount) | | |
| | | | |
| | Sub station | IS-DVF | Vandal-resistant video door station (flush-mount) | 20 | 160 |
| | IS-SS*3 | Vandal-resistant audio door station (flush-mount) | | |
| | | | |
| | | IS-RS*3 | Room sub station | 120 | 960 |
| | Control unit | IS-IPC | IP control unit | - | |
| | Master station | IS-IPMV | Color monitor IP master station | - | 32*4 |
| IP | IS-SOFT (PC master station) | PC master station | - |
| |
| | Sub station | IS-IPDV | IP vandal-resistant video door station (surface-mount) | - | |
| | IS-IPDVF | IP vandal-resistant video door station (flush-mount) | - | |
| | | |
*3: You can use vandal-resistant audio door stations (IS-SS) instead of room sub stations (IS-RS) and vice versa.
*4: Up to 8 IP control units (IS-IPC) can be connected with an IP network per site. If you do so, the maximum number of other IP units that can be connected to the IP network is 24 per site. One local system can be connected with an IP control unit (IS-IPC).
Up to 31 PC master stations (IS-SOFT) can be connected with an IP network per site. If you do so, at least one IP control unit (IS-IPC), color monitor IP master station (IS-IPMV) or IP vandal-resistant video door station (IS-IPDV or IS-IPDVF) should be also connected.
