# Hardware SIM Racks & Modem Control

To interface with live telecommunication networks, **Asterisk 2** orchestrates multi-channel hardware modem racks. The application pairs directly with enterprise **Dinstar SIM Banks** to route mobile calls across optimized physical cellular interfaces.

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## Hardware Interfacing Architecture

The flowchart below maps out how background workers poll active GSM slots to refresh line tracking metrics:

```mermaid
graph TD
    %% Source Hardware
    subgraph TelecomRacks["Physical Data Center Infrastructure"]
        ModemBank["Dinstar GSM Gateway Rack<br/>(32 Integrated Modules)"]
    end

    %% Network Adapter
    subgraph CommunicationBus["Network Management API"]
        DriverWorker["GatewayStatusWorker.cs<br/>(HTTP Polling Hooks)"]
    end

    %% Storage Map
    subgraph RelationalStorage["Persistent Telephony Store"]
        DbSim[("SimProfiles DB Table<br/>(Port Tracking Row)")]
    end

    %% Downstream Logic
    subgraph CallRouter["PBX Core Balancer"]
        KamailioDisp["Kamailio Gateway Dispatcher<br/>(ds_select_dst Engine)"]
    end

    %% Links
    ModemBank <-->|"JSON Metrics Handshake"| DriverWorker
    DriverWorker ==>|"Write Port Health"| DbSim
    DbSim ==>|"Load Outbound Target"| KamailioDisp

    %% Dynamic Aesthetic System
    classDef rackToken fill:#0f172a,stroke:#38bdf8,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef busToken fill:#1e293b,stroke:#a855f7,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef dbToken fill:#312e81,stroke:#ec4899,stroke-width:2px,color:#fff,rx:6px,ry:6px;
    classDef routerToken fill:#065f46,stroke:#10b981,stroke-width:2px,color:#fff,rx:6px,ry:6px;

    class TelecomRacks,ModemBank rackToken;
    class CommunicationBus,DriverWorker busToken;
    class RelationalStorage,DbSim dbToken;
    class CallRouter,KamailioDisp routerToken;
```

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## Hardware Integration Policies

### 1. Circuit Breaker Limits
To protect backend worker threads during temporary data center outages, hardware network clients wrap telemetry requests in strict 2000-millisecond execution timeout blocks. 

### 2. Isolated Hardware Networks
Physical GSM gateway configurations communicate over dedicated secondary network interface cards (`192.168.10.x`), preventing heavy media frame loops from saturating standard HTTP API transport adapters.