Circuit Attributes: VT VCAT Circuit


(ONS 15310-CL and ONS 15454 only) Use the Circuit Attributes page to provision basic circuit parameters. The following table describes the Circuit Attributes page fields and buttons that appear for virtual tributary (VT) virtual concatenated (VCAT) circuits. The ONS 15310-CL and ONS 15454 CE-100T-8 cards support VT VCAT circuits.

Item

Description

Name

The circuit name. The name can be alphanumeric and up to 48 characters, (including spaces). Circuit names should be 44 characters or less if you want to preserve the ability to create monitor circuits. If you leave the field blank, CTC assigns a default name to the circuit.

Type

(Display only) Displays the type chosen in the Circuit Creation page.

Bidirectional

(Display only) Checked is the default for VT-V circuits.

Create cross-connects only (TL1-like)

Creates one or more cross-connects to complete a signal path for TL1-generated circuits. If this box is checked, you cannot assign a name to the circuit or choose an E-Series card as a circuit source or destination.

State

Lists the administrative states. An administrative state puts the circuit cross-connects into the related service state if network conditions allow:

  • OOS,DSBLD-Puts the circuit cross-connects in the Out-of-Service and Management, Disabled (OOS-MA,DSBLD) service state. Traffic is not passed on the circuit.

  • IS-Puts the circuit cross-connects in the In-Service, Normal (IS-NR) service state.

  • IS,AINS-Puts the circuit cross-connects in the Out-of-Service and Autonomous, Automatic In-Service (OOS-AU,AINS) service state. Alarms and conditions are suppressed. When the connections receive a valid signal, the service state automatically changes to IS-NR.

  • OOS,MT-Puts the circuit cross-connects in the Out-of-Service and Management, Maintenance (OOS-MA,MT) service state. The OOS-MA,MT service state does not interrupt traffic flow; it suppresses alarms and conditions and allows loopbacks to be performed on the circuit. Use the OOS,MT administrative state for circuit testing or to suppress circuit alarms temporarily. Change the administrative state to IS; IS,AINS; or OOS,DSBLD when testing is complete.

  • OOS,OOG-(VCAT link capacity adjustment scheme [LCAS] circuits only) Puts the circuit cross-connects in the Out-of-Service and Management, Out-of-Group (OOS-MA,OOG) service state. The OOS,OOG administrative state is used to place a VCAT member circuit out of the group and to stop sending traffic. OOS,OOG only applies to the cross-connect on the end node where the VCAT resides.

Apply to drop ports

Applies the state chosen in the State field to the circuit source and destination ports. CTC applies the circuit state to the ports only in the following cases:

  • The circuit bandwidth is the same as the port bandwidth.

  • The port bandwidth is larger than the circuit and the circuit is the first circuit to use the drop port.

A Warning dialog box shows the ports where the circuit state could not be applied. If the box is unchecked, CTC does not change the state of the source and destination ports.

Symmetric

(Display only) Provisions the same the number of members in both directions. Members use the same set of time slots but in opposite directions.

Member size

(Display only) VT1.5.

Num. of Members

Sets the number of members. Valid entries are 1 through 64.

Mode

Sets the VCAT circuit mode. Valid entries are:

  • None: No mode is provisioned.

  • Sw-LCAS: Allows temporary removal of an existing member when a member fails. The failed member is removed for the duration of the failure. Use Sw-LCAS when interoperating with the ML-Series cards, which do not support the full Link Capacity Adjustment Scheme (LCAS) functionality.

  • LCAS: Allows the members in a VCAT group to be changed without interrupting the operation of noninvolved members (errorless). In addition, when a member fails, LCAS temporarily removes the failed member from the VCAT circuit for the duration of the failure, leaving the remaining members to carry the traffic.

Provision working go & return on primary path

If checked, the shortest path is the working path for both traffic directions. If unchecked, only one direction makes the shortest path the working path.

Revertive

If checked, traffic reverts to the working path when the conditions that diverted it to the protect path are repaired. If unchecked, traffic remains on the protect path after the switch.

Reversion time

Available when Revertive is checked. Sets the amount of time that will elapse before traffic reverts to the working path. Traffic can revert when conditions causing the switch are cleared. The range is 0.5 to 12.0 minutes. The default is 5.0 minutes.

SF threshold

Sets the unidirectional path switched ring (UPSR) path-level signal failure bit error rate (BER) thresholds. Valid entries are IE-3, IE-4, and IE-5.

SD threshold

Sets the UPSR path-level signal degrade BER thresholds. Valid entries are IE-5, IE-6, IE-7, IE-8, and IE-9.

Switch on PDI-P

(Display only). Unavailable for VT circuits.

Back

Displays the Circuit Creation page.

Next

Displays the Circuit Source page.

Cancel

Cancels circuit creation.

Help

Displays context-sensitive help.