Circuits on Span


Use the Circuits on Span dialog box to view circuit span usage information and, for unidirectional path switched ring (UPSR) spans, to perform span switches and lockouts.

Item

Description

STS

Shows the specific synchronous transport signal (STS) number.

VT

Shows the virtual tributary (VT) number.

UPSR

(UPSR circuits only) If the STS and VT are protected by a UPSR, a check appears in the UPSR column.

Circuit

Shows the circuit name that uses the STS and VT. If the STS and VT are not used by a circuit, "unused" is displayed. For virtual concatenated (VCAT) circuits, the name of the VCAT circuit is shown with the member circuit name in brackets.

Switch State

(UPSR circuits only) Shows the switch state of the circuit span. Valid values are:

  • CLEAR: No UPSR switch is active.

  • MANUAL: A Manual switch is active on the span.

  • FORCE: A Force switch is active on the span.

  • LOCKOUT_OF_PROTECTION: A protection Lockout is active on the span; traffic cannot be switched to it.

Perform UPSR span switching

(UPSR circuits only) Allows you to initiate a span switch. Valid entries are:

  • CLEAR: Clears any UPSR switches that are active on the span.

  • MANUAL: Initiates a Manual switch on the span.

  • FORCE: Initiates a Force switch on the span.

  • LOCKOUT_OF_PROTECTION: Initiates a protection Lockout on the span; traffic cannot be switched to it.

Apply

Applies the switch or lockout.

Help

Displays CTC context-sensitive help.