# tt_fabric_tx_bandwidth_megabytes_per_second

[<< Home](../index.md) | [<< Metrics](../metrics.md)

## Name

### Prometheus Metric Name

```
tt_fabric_tx_bandwidth_megabytes_per_second
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/tray{tray}/chip{chip}/channel{channel}/fabric/tt_fabric_tx_bandwidth_megabytes_per_second
```

Example path:

```
bh-glx-c09u02/tray1/chip2/channel0/fabric/tt_fabric_tx_bandwidth_megabytes_per_second
```

## Description

The transmit bandwidth on a specific fabric Ethernet channel in megabytes per second (MB/s). This is calculated from the delta of transmitted words and elapsed clock cycles between consecutive telemetry samples, using the AI clock frequency for time conversion. The bandwidth is computed over all cycles (including idle). This metric is available on Wormhole B0 and Blackhole devices.

Note: Fabric metrics are only updated by fabric firmware when workloads are run with fabric telemetry explicitly enabled. For example, by setting the environment variable `TT_METAL_FABRIC_TELEMETRY` to `1`.

## Values

**Type:** Floating Point

**Units:** Megabytes per second (MB/s)

**Allowable values:**
A non-negative floating-point number representing the transmit bandwidth. For example, `500.0` means 500 MB/s of transmit throughput.

## Prometheus Labels

|Label Name|Value|
|---|---|
|hostname|The host from which the metric was collected.|
|hall|The datacenter hall where the host is located. Sourced from the Factory System Descriptor (FSD).|
|aisle|The datacenter aisle where the host is located. Sourced from the Factory System Descriptor (FSD).|
|rack|The rack number where the host is located. Sourced from the Factory System Descriptor (FSD).|
|shelf_u|The shelf U position in the rack where the host is located. Sourced from the Factory System Descriptor (FSD).|
|tray|The tray (UBB) that the device is located on.|
|chip|The ASIC location within the tray.|
|channel|The Ethernet channel number on the chip.|
|port_type|The physical port type (e.g., QSFP, backplane). Present when topology information is available.|
|port_id|The physical port ID. Present when topology information is available.|
|remote_hostname|The hostname of the remote endpoint. Present when remote endpoint information is available.|
|remote_tray|The tray number of the remote endpoint. Present when remote endpoint information is available.|
|remote_chip|The ASIC location of the remote endpoint. Present when remote endpoint information is available.|
|remote_channel|The Ethernet channel of the remote endpoint. Present when remote endpoint information is available.|
|remote_hall|The datacenter hall of the remote endpoint. Present when remote endpoint information is available.|
|remote_aisle|The datacenter aisle of the remote endpoint. Present when remote endpoint information is available.|
|remote_rack|The rack number of the remote endpoint. Present when remote endpoint information is available.|
|remote_shelf_u|The shelf U position of the remote endpoint. Present when remote endpoint information is available.|