Specifications

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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 T3 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 DS3 lines:
• Line type
• Line length (distance in meters)
• C-bit checking
• Line clock source
• Out of Frame alarm criteria
• RcvFEACValidation
The following procedure describes how to configure T3 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_LA.3.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_LA.3.AXSM.a > dspln -ds3 1.1
Line Number : 1.1
Admin Status : Up Alarm Status : Clear
Line Type : ds3cbitadm Number of ports : 1
Line Coding : ds3B3ZS Number of partitions: 0
Line Length(meters) : 0 Number of SPVC : 0
OOFCriteria : 3Of8Bits Number of SPVP : 0
AIS c-Bits Check : Check Number of SVC : 0
Loopback : NoLoop
Xmt. Clock source : localTiming
Rcv FEAC Validation : 4 out of 5 FEAC codes
For more information, see “Verifying Line Configuration,” which appears later in this chapter.
Step 4 To configure a T3 line, enter the cnfln command, as shown in the following example.
8850_LA.3.AXSM.a > cnfln -ds3 <bay.line> -len <LineLength> -clk <clockSource>
-lt <LineType> -oof <OOFCriteria> -cb <AIScBitsCheck> -rfeac <RcvFEACValidation>
Table 3-4 lists the parameter descriptions for configuring SONET, T3 and E3 lines. Be sure to use only
the parameters listed for T3 lines.
Step 5 To verify your configuration changes, enter the dspln command.