# TDM & Hardware Statistics

This section covers monitoring for physical hardware adapters, TDM interfaces, H.248 gateways, SS7/M2UA signaling, and firewall statistics. These metrics are relevant for deployments with media gateway cards and TDM connectivity.

***

## Hardware Adapters

MaaS monitors all hardware units (media gateway cards) in your TMedia system.

### Adapter Metrics

| Statistic    | Type   | Description                         |
| ------------ | ------ | ----------------------------------- |
| **Status**   | Binary | Up (1) or Down (0)                  |
| **HA State** | Text   | High availability operational state |
| CPU 0 Usage  | %      | Core 0 utilization                  |
| CPU 1 Usage  | %      | Core 1 utilization                  |

### N+1 Backup Support

MaaS tracks adapter replacements for N+1 backup scenarios, maintaining the relationship between replaced and replacement units.

***

## TDM Interface Types

MaaS monitors three categories of TDM interfaces:

| Interface Type | Description                          |
| -------------- | ------------------------------------ |
| E1/T1/J1       | Standard telephony spans             |
| DS3            | High-capacity digital signal level 3 |
| OC3/STM-1      | SONET/SDH optical interfaces         |

***

## E1/T1/J1 Statistics

### Line State

| Statistic | Type | Description            |
| --------- | ---- | ---------------------- |
| **State** | Text | Line operational state |

### Call Statistics (Per Span)

| Statistic   | Units     | Description                     |
| ----------- | --------- | ------------------------------- |
| Accepted    | Calls     | Successfully accepted calls     |
| Answered    | Calls     | Connected calls                 |
| Alerted     | Calls     | Calls in alerting state         |
| In Progress | Calls     | Calls being set up              |
| Terminating | Calls     | Calls being torn down           |
| Media Only  | Calls     | Media-only (no signaling) calls |
| **Idle**    | Timeslots | Available timeslots             |

***

## DS3 Statistics

### Interface State

| Statistic | Type | Description                 |
| --------- | ---- | --------------------------- |
| State     | Text | Interface operational state |

### Call Statistics

Same metrics as E1/T1:

* Accepted, Answered, Alerted, In Progress, Terminating, Media Only, Idle

***

## OC3/STM-1 Statistics

### Interface State

| Statistic | Type | Description                          |
| --------- | ---- | ------------------------------------ |
| State     | Text | Primary interface state              |
| APS State | Text | Automatic Protection Switching state |

### Call Statistics

Same metrics as E1/T1:

* Accepted, Answered, Alerted, In Progress, Terminating, Media Only, Idle

***

## H.248/MEGACO Gateway Statistics

For systems with H.248 gateway functionality, MaaS monitors the gateway stack and MGC connections.

### H.248 Metrics

| Statistic             | Type  | Description                       |
| --------------------- | ----- | --------------------------------- |
| **Congestion**        | Text  | Gateway congestion status         |
| Fixed Term In-Service | Count | In-service fixed terminations     |
| Fixed Term OOS        | Count | Out-of-service fixed terminations |
| Media Only Calls      | Calls | Media-only call count             |

### MGC Status

MaaS monitors up to 4 Media Gateway Controllers:

| Statistic  | Description                  |
| ---------- | ---------------------------- |
| MGC1 State | Primary MGC connection state |
| MGC2 State | Secondary MGC state          |
| MGC3 State | Tertiary MGC state           |
| MGC4 State | Quaternary MGC state         |

***

## SS7/M2UA Signaling Statistics

For systems with SS7 signaling via M2UA, MaaS provides hierarchical monitoring:

```
Adapter
  └── M2UA SAP (Service Access Point)
        └── M2UA Cluster
              ├── M2UA Links
              └── M2UA Peers
```

### M2UA Link Statistics

| Statistic           | Type   | Description                |
| ------------------- | ------ | -------------------------- |
| **M2UA Link State** | Binary | Link up (1) or down (0)    |
| **MTP2 Link State** | Binary | Underlying MTP2 link state |

### M2UA Peer Statistics

| Statistic      | Type   | Description                     |
| -------------- | ------ | ------------------------------- |
| **Peer State** | Binary | Peer active (1) or inactive (0) |

***

## Firewall Statistics

When TBRouter firewall is enabled on a host, additional metrics are available:

| Statistic          | Description                  |
| ------------------ | ---------------------------- |
| DDoS Alarm         | DDoS detection status        |
| High CPU           | Firewall CPU alarm           |
| List Full          | Connection list capacity     |
| Reboot Required    | Firewall reboot pending      |
| Scheduling Problem | Firewall scheduling issues   |
| Threshold Alarm    | Threshold exceeded indicator |

Firewall statistics are automatically available when the firewall is enabled on a host.

***

## Alerts

### High Severity

| Alert              | Condition      | Description                         |
| ------------------ | -------------- | ----------------------------------- |
| Hardware Unit Down | Status = 0     | Physical media gateway card offline |
| M2UA Peer Down     | Peer State = 0 | SS7 signaling peer connection lost  |

### Average Severity

| Alert                       | Condition                  | Description                                     |
| --------------------------- | -------------------------- | ----------------------------------------------- |
| TDM Line Bouncing           | >4 state changes in 1 hour | TDM span is experiencing frequent state changes |
| Firewall DDoS Alarm         | DDoS alarm triggered       | Firewall has detected a potential DDoS attack   |
| Firewall Scheduling Problem | Scheduling issues detected | Firewall has scheduling problems                |

### Information Severity

| Alert            | Condition        | Description            |
| ---------------- | ---------------- | ---------------------- |
| TDM State Change | Any state change | TDM line state changed |

***

## Troubleshooting

{% stepper %}
{% step %}

#### Line Bouncing

Frequent state changes on TDM spans typically indicate physical layer issues (cabling, cross-connects), timing/clocking problems, or far-end equipment issues. The "Line Bouncing" alert triggers when a span changes state more than 4 times in an hour.
{% endstep %}

{% step %}

#### Idle Timeslot Monitoring

Monitoring idle timeslots helps identify capacity utilization per span, uneven load distribution across spans, and potential misconfiguration (timeslots never used).
{% endstep %}

{% step %}

#### Fixed Termination Health

For H.248 gateways, comparing in-service vs out-of-service fixed terminations indicates overall gateway health, TDM span issues affecting terminations, and configuration problems.
{% endstep %}
{% endstepper %}


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