# ubr

#### Syntax

ubr [ pcr ]

no ubr

#### Release Information

Command introduced in JunosE Release 7.1.0.
ATM VC Class Configuration mode added in JunosE Release 7.3.0.

#### Description

In ATM VC Configuration mode, configures the unspecified bit rate (UBR) service category on an ATM PVC. Optionally, you can specify a peak cell rate (PCR). The ubr command is valid only for data PVCs; you cannot use this command for control (ILMI or signaling) PVCs. The no version restores the default service category, UBR without a PCR.

In ATM VC Class Configuration mode, configures the UBR service category as part of a VC class definition that you assign to an ATM data PVC. The no version restores the default service category, UBR without a PCR, in the VC class.

#### Options

- pcr—Peak cell rate, in Kbps, in the range 0–149760 (for OC3 ATM modules) or 0–599040 (for OC12 ATM modules)

#### Mode

ATM VC Configuration, ATM VC Class Configuration