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Configuring T3 Cards

This chapter covers the following topics:
Introduction
Installing the T3 card
Connecting the MAX TNT T3 card to the WAN
Interpreting a T3 card's status lights
Overview of T3 configuration
Understanding T3 configuration requirements
Understanding T3-card profiles
Assigning a name to a T3 profile
Enabling a line
Configuring the T3 physical link
Configuring clocking

Introduction

The MAX TNT T3 card is a communications circuit composed of seven DS2s, each of which includes four DS1s, each of which in turn is composed of 24 DS0s, for a total of 672 DS0 channels.

On the T3 card, DS2 #1 includes DS1 lines 1-4, DS2 #2 includes DS1 lines 5-8, and so on. Each DS1 is similar to a T1 line, except that on the T3 card, a DS1 only functions if the DS2 and DS3 of which it is a component are up and in frame.

You can think of the T3 card as 28 T1 lines, because it provides 28 independently configurable DS1 lines. Each of the DS1 lines has the same capabilities as the DS1 lines on a T1 card. DS1-level status and management via SNMP for the T3 card is the same as for the eight-port T1-card. No DS3-level status or management via SNMP is currently available.

The MAX TNT T3 card is illustrated in Figure 9-1.

Figure 9-1. T3 card

Installing the T3 card

You install T3 cards in the same way you install other MAX TNT slot cards. For instructions, see Installing a slot card.

Connecting the MAX TNT T3 card to the WAN

Connect the T3 line to the T3 card with two 75 Ohm coaxial cables (RG 59/U). To provide for redundant operation, the T3 card has a second pair of BNC jacks that can be used to connect to a second T3 card or other Data Terminal Equipment (DTE).

When the T3 card is not powered or is in the reset state, the Line RX and Line TX signals are electrically connected to the Bypass RX and Bypass TX jacks, respectively. When the T3 card passes POST, a relay switch connects the Line jacks to the card's T3 transceiver.

Inform your service provider that the equipment is connected, so they can bring up the line.

Interpreting a T3 card's status lights

All status lights except LA are lit upon power-up or reset and remain so until the card passes POST. If no LEDs are lit, the DS3 interface is either disabled or is receiving an Alarm Indication Signal (AIS) or Idle Signal.

Table 9-1 explains the T3 card status lights.

Table 9-1. T3-card status lights

Lights

Description
LA

Green. Indicates the DS3 interface is enabled and has not detected any error conditions.

RA

 Red. Indicates the DS3 interface is experiencing loss of receive signal.

LO

 Red. Indicates the DS3 interface is out of frame alignment.

YA

 Yellow. Indicates the DS3 interface has detected Far End Receive Failure indication transmitted from the other side.

FAULT

 Yellow. Behaves as follows:

  • On after you reset the unit.

  • Off after the unit passes Power-On Self Test (POST) and is running.

  • Blinks if a fatal error has occurred.

Overview of T3 configuration

Table 9-2 lists the sections describing common tasks you might have to perform to configure a T3 line. The table includes a brief description of each task, and lists the parameters you will use.

(This chapter only describes the specifics that apply to a T3 card. For information about configuring T1 profiles, see Chapter 7, "Configuring T1 Cards.")

For complete information about the associated parameters, see the MAX TNT Reference Guide.

Table 9-2. T3 line configuration tasks

Task

Description

Associated parameters
Understanding T3 configuration requirements.

 Although you configure the T3 card similarly to the port T1 card, there are important differences you should understand before configuring the card.

Clock-Source

Clock-Priority

NFAS-ID

FDL

Front-End-Type

DSX-Line-Length

CSU-Buildout

Understanding T3-card profiles.

 The MAX TNT creates a single T3 profile and 28 T1 profiles for each T3 card in the system.

N/A

Assigning a name to a T3 profile.

 Assign a name to the T3 profile.

Name

Enabling a line.

Make a line available for use.

 Enabled

Configuring the T3 physical link.

 Before you configure the T1 profiles that make up the T3 card, you must first configure the T3 physical line parameters in the T3 profile.

Physical-Address

Enabled

Frame-Type

Line-Length

Configuring clocking.

 Any of the T1 lines associated with a T3 card can be configured as the clock source for the MAX TNT system.

Clock-Source

Clock-Priority

Understanding T3 configuration requirements

Configuring the T3 card is very similar to configuring the eight-port T1 card, but with some important differences. Table 9-3 lists the differences.

Table 9-3. Differences between T3-card configuration and T1-card configuration

Parameter

Difference
NFAS-ID

 The T3 card supports up to 14 NFAS groups. An NFAS group may be composed of up to 28 lines, subject to the limitations of the switch. NFAS is configured in the same way as for the eight-port T1 card.

FDL

 The DS1-level FDL services supported by the T3 card are the same as the for eight-port T1 card. DS3-level FDL capabilities such as the Far-End Alarm and Control Channel (FEAC) and Path Maintenance Data Link are currently unsupported. (For information on specifying FDL, see the MAX TNT Adminstration Guide.)

Front-End-Type

DSX-Line-Length

CSU-Build-Out

 These parameters are ignored for T1 profiles that apply to the T3 card.

Understanding T3-card profiles

When the MAX TNT first detects the presence of a T3 card, it creates the following profiles for each card:

T3 profile

 When the MAX TNT first detects the presence of a T3 card, it creates a default T3 profile for the card. For example, after installing a T3 card installed in slot 7, you could verify the creation of a T3 profile as follows:

The following example shows the parameters in a T3 profile, with sample settings:

Call-Route profile

 At the same time that it creates a T3 profile, the MAX TNT creates one default Call-Route profile that routes outbound trunk calls to any line on the card. You can display the Call-Route profile as shown in the following example:

T1 profiles

 The MAX TNT also creates twenty-eight T1 profiles for the T3 interface. You use these profiles to configure parameters for each of the DS1s that make up the T3.

The following example shows the parameters in a T1 profile, with sample settings:

These T1 profiles are identical to those created for the DS1s on an eight-port T1 card.

Assigning a name to a T3 profile

In a T3 profile, the Name parameter enables you to assign the profile a name of up to 16 characters. It is displayed after the line's physical address in the Dir command output. For example:

For T3 lines, the Line Status window displays the first eight characters of the name if one has been assigned. For example:

"T3 Trunk"  1/15/00 LA la  la  la  la  la  la  la
If the name is longer than eight characters, the last character displayed is a plus-sign (+).

Enabling a line

By default each DS3 line is disabled. When the DS3 interface is disabled, it transmits the DS3 Idle Signal to the far end.

To enable a T3 line, read its profile to make it the working profile, then set enable to Yes, as in the following example:

Configuring the T3 physical link

You must specify a frame type and the length of the lines that connect the MAX TNT T3 card to the DSX-3 cross-connect. The line length should reflect the longest line length you expect to encounter in your installation. For a direct connection, double the value.

To configure the T3 cards physical link, read its profile into the edit buffer, and enter the following commands:

Configuring clocking

For DS1 transmission, the T3 card uses the same system-wide PLL synchronous clock source used by the eight-port T1 cards. Any of the T3 T1 lines can serve as the clock source for the MAX TNT system.

(For information about specifying a clock source, see Configuring clocking.)


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