Cisco Systems MGX 8230 manual Configuring Synchronization for the Shelf, Clock Sources

Chapter 6 Card and Service Configuration

The Processor Switching Module

The Processor Switching Module

This section describes how to activate and configure the card-level parameters, lines, and ports on the PXM1 uplink card.

This section also describes how to add connections to the PXM1 in a stand-alone node.

The descriptions include instructions complete the following tasks:

•Modify the resource partitioning at the card level (optional).

•Activate a line on the uplink card. On a stand-alone node, you can activate more than one line if the uplink card has multiple lines. One physical line must be the trunk to a network routing node.

•Optionally configure a clock source on the PXM1 or a service module. Note that a service module line must be active before you can configure it as a clock source. Refer to the section “Configuring Synchronization for the Shelf” for more information.

•If the shelf has a pair of SRMs for bulk distribution and you use the CLI rather than the CiscoView application, activate the SRM lines from the PXM1.

•Optionally modify the resource partitioning at the port level.

•Create logical ports.

•On a stand-alone node, specify the cell header type. UNI cell headers typically apply where a workstation connects to a UNI port on the uplink card rather than a port on the PXM1-UI card. Such an implementation is not common.

•On a stand-alone node, add standard connections and optional management connections.

•On a stand-alone node, configure Automatic Protection Switching (APS).

•For a feeder, execute steps on the connected BPX 8600 series switch to make the feeder an available resource in the network.

Note For a description of the bit error rate test (BERT) functions, see the section titled “Bit Error Rate Testing Through an MGX-SRM-3T3.”

Configuring Synchronization for the Shelf

This section defines the clock sources for the MGX 8230, then describes how to configure each source.

Clock Sources

The available clock sources are as follows:

•The internal clock comes from an oscillator on the PXM1. It is the default source when the shelf first comes up and remains so until you specify a different clock source. This default source is a Stratum 4 clock. Stratum 3 can also be used as an internal clock source.

•The trunk interface clock originates on a BPX 8600 series node or another vendor’s switch and comes through the line on the PXM1’s back card.

•An external clock source comes from an external timing source and arrives at the T1 or E1 connections on the PXM1 user interface back card. Frequently, the external device is a highly reliable, dedicated device.

•For external Stratum 4 clock sources, the PXM1-UI back card must be used.

	Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001		6-5