ADTRAN 4200659L2 User Manual
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INTERFACE

Chapter 3. Configuration

External Clock Configuration

PRI Ext. Clock and SEC Ext. Clock - When timing is set to external, these entries allow selection of the primary and secondary clock source. Any one of the 28 ports, so long as it is active, can be used. If the selected port does go into AIS or LOS, the selected clock becomes invalid.

VT INTERFACE

The VT INTERFACE menu (shown inFigure 3-4 on page 3-7)allows you to activate/deactivate individual T1s and E1s and to set their line coding, length, loopback detection, circuit protection, and line ID string. The T1/E1 code violation threshold is also configured through this menu. Configuration selections are described in the sections followingFigure 3-4 on page 3-7.

A VT group can be divided into either three E1s or four T1s. Therefore, when dealing with an E1 configuration, some of the fields in the VT menus do not apply (and therefore displayN/A).

Figure 3-4.VT Interface Menu

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Chapter 3. Configuration

VT Interface #1-28

The VT Interface menu allows the user to map a Port (T1/E1) to a VT, activate/deactivate the T1 and E1 mapped to the VT, and to set the line coding, length, loopback detection, circuit protection, line ID string, and disable/enable the hairpin loopback. Configuration selections are described in the section following Figure 3-5.

Figure 3-5.Configure VT Interface #1 Menu

VT/Port Mapping

Map a T1/E1 port to a VT. Any available port (1-28)can be mapped to a VT. An error will be returned if the port is already mapped to another VT. SelectingUNEQUIPPED will free the port from mapping and disable the VT.

T1 State

Set unused T1 lines to DISABLED. Set used T1 lines toENABLED.

T1 Coding

Set the line code for each individual T1 interface to match the connected device. The choices available for T1 are AMI andB8ZS.

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Chapter 3. Configuration

T1 Line Length

Set the line length for each T1 interface according to the distance from the MX2800 STS-1to your DTE device. Set to-7.5 DB if the attached DTE device only supports DS1 levels.

T1 Remote Loopback

Allows a selected T1 to respond to CSU or NIU loopbacks arriving from the STS-1side.

T1 Circuit Protection

T1 Circuit Protection determines which circuit will be allowed to initiate a protection switch if a failure in the circuitry for that channel is detected. If a T1 is set to DISABLED, then the failure of the circuitry of that one channel will not cause a protection switch. If set to ENABLED, then the failure of a channel could cause a protection switch to occur (depending on the PROTECTIONTHRESHOLDsetting).

Hairpin Loopback

Hairpin back the VT to the STS-1signal for dropping farther down the SONET ring.

Line ID

Enter user-configurabletext strings to name the individual T1 lines. This field will accept up to 18alpha-numericcharacters, including spaces and special characters (such as an underbar).

Set Multiple

SET MULTIPLE (seeFigure 3-6 on page 3-10)can be used to enable/ disable a contiguous group or all of the VTs at one time. It may also be used to make multiple changes to the line coding, length, circuit protection or loopback detection of a contiguous group or all VTs at one time.

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Chapter 3. Configuration

To make changes to all VTs, set FIRST to1 andLAST to28. Make the necessary changes and selectAPPLY ALL (or select theAPPLY option that corresponds to the change made) before leaving the menu. To make changes to some of the VTs, set theFIRST andLAST fields to correspond to the lines you want to change. SelectAPPLY ALL (or select theAPPLY option that corresponds to the change made). You can now either leave the menu or continue to enter newFIRST andLAST numbers for other lines. Remember to apply the settings following each change.

Figure 3-6.Set Multiple Menu

Set Cross-ConnectMapping

Any VT can be cross-connectmapped to any available T1/E1 port. SelectingUNEQUIPPED will free the port and disable the VT. The default mapping for VTs1-28is1-to-1.

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Chapter 3. Configuration

Figure 3-7.SetCross-ConnectMapping Menu

Restore Defaults

Restores VT mapping to 1-to-1mapping.

Restore VT Mapping Defaults

Select RESTOREVT MAPPINGDEFAULTSfrom the VT INTERFACE

configuration menu. The following message will display on the

screen: !WARNING! RESTORING DEFAULTS WILL DISRUPT TRAFFIC.

Select CONFIRM to continue or pressEsc to abort.

Protection Threshold (1-28)

The PROTECTION THRESHOLD setting determines how many of theENABLED lines must fail before a card switch occurs. If you want the failure of a single protected (enabled) line to cause a card switch, set thePROTECTION THRESHOLD to1. Choices include1 through28.

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Chapter 3. Configuration

XCV Threshold

Set a limit on code violations (CVs) accepted by the unit over an individual T1/E1 line before it switches controller cards (see Figure 3-8).If set toDISABLED, code violations will not cause the unit to switch controller cards. The threshold limits are described in the following chart:

Setting

The unit switches controller cards if...

 

 

1E-3

more than one out of every 1,000 bits received on a

T1/E1 line contains a code violation

 

 

 

1E-4

more than one out of every 10,000 bits received on a

T1/E1 line contains a code violation.

 

 

 

1E-5

more than one out of every 100,000 bits received on a

T1/E1 line contains a code violation.

 

 

 

1E-6

more than one out of every 1,000,000 bits received on

a T1/E1 line contains a code violation.

 

 

 

Figure 3-8.XCV Threshold Menu

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