Specifications

3-15
Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 3 Preparing AXSM Cards and Lines for Communication
Setting Up Lines
Configuring SONET Lines
All line types are brought up with a default configuration. When configuring trunks between two
MGX 8850 or MGX 8950 switches, you may be able to accept the defaults for each switch and thus
minimize configuration time. When configuring a line to another type of device, ensure that both devices
are using the same configuration parameters on the shared line.
At the physical communications level, you can configure the following options for SONET lines:
• Line type
• Line clock source
The following procedure describes how to configure SONET lines.
Step 1 Establish a configuration session using a user name with GROUP1 privileges or higher.
Step 2 If you do not know the line number you want to configure, enter the dsplns command to display a list
of the lines.
8850_NY.1.AXSM.a > dsplns
Remember that you cannot configure a line until you have brought it up as described in the previous
section, “Bringing Up Lines.”
Step 3 To display the configuration for a line, enter the dspln command. For example:
8850_NY.1.AXSM.a > dspln -sonet 1.2
Line Number : 1.2
Admin Status : Up Alarm Status : Critical
Loopback : NoLoop APS enabled : Disable
Frame Scrambling : Enable Number of ports : 1
Xmt Clock source : localTiming Number of partitions: 1
Line Type : sonetSts12c Number of SPVC : 1
Medium Type(SONET/SDH) : SONET Number of SPVP : 0
Medium Time Elapsed : 528464 Number of SVC : 0
Medium Valid Intervals : 96
Medium Line Type : ShortSMF
For more information, see the “Verifying Line Configuration” section later in this chapter.
Step 4 To configure a SONET line, enter the following commands:
8850_NY.1.AXSM.a > cnfln -sonet <bay.line> -slt <LineType> -clk <clockSource>
Table 3-4 lists the parameter descriptions for configuring SONET, DS3 and E3 lines. Be sure to use only
the parameters listed for SONET lines.