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Configuring 1-Port Clear Channel DS3/E3 GPIM

The 1-Port Clear Channel DS3/E3 GPIM is a channel interface that can support full-duplex DS3 (T3) or E3 line rates. The below topics shows the overview of the interface, examplse on how to configure the 1-Port Clear Channel DS3/E3 GPIM for DS3 port mode, E3 port mode and M23 mapping mode respectively.

Understanding the 1-Port Clear Channel DS3/E3 GPIM

The 1-Port Clear Channel DS3/E3 Gigabit-Backplane Physical Interface Module (GPIM) for the device functions as a clear channel interface that can support full-duplex DS3 (T3) or E3 line rates of 44.796 or 34.368 Mbps, respectively. The DS3/E3 interface is a popular high-bandwidth WAN interface for large enterprise branch locations that enables high-quality voice, video, and data applications with reduced latency. The GPIM device does not support channelization, but it supports a subrate DS3/E3 configuration.

This topic includes the following sections:

Supported Features

The clear channel implementation provides such features as subrate and scrambling options used by major DSU vendors. The following key features are available depending on the interface and mode selections:

  • Framed and unframed DS3 (default) and E3 port modes

  • Support for frame relay, point-to-point, and HDLC serial encapsulation protocols

  • Support for popular vendor algorithms for subrate and payload scrambling

  • Support for generation and detection of loopback control codes (line-loopback activate and deactivate) and FEAC codes

  • External and internal clocking support

  • Support for DS3 and E3 network alarms

  • Support for chassis clusters

  • Support for anti-counterfeit check

  • Loopback (local, remote, and payload) and BERT/PRBS/QRSS diagnostics support

  • MTU size of 4474 bytes (default) and 9192 bytes (maximum)

Interface Naming

The following format represents the 1-Port Clear Channel DS3/E3 GPIM interface names:

where:

  • type—Media type (T3 or E3)

  • fpc—Number of the Flexible PIC Concentrator (FPC) card on which the physical interface is located

  • pic—Number of the PIC on which the physical interface is located

  • port—Specific port on the PIC

Examples: t3-1/0/0 and e3-2/0/0

Physical Interface Settings

The 1-Port Clear Channel DS3/E3 GPIM supports IP configurations. Using the CLI, you can configure the 1-Port Clear Channel DS3/E3 GPIM to operate in either DS3 or E3 mode. By default, at installation the physical interface, t3-x/y/z, is enabled on the GPIM port operating in DS3 mode with T3 framing.

You can reset the mode of the physical interface to E3 using the edit chassis command:

Logical Interface Settings

The logical interface for the device is determined by setting the t3-options or e3-options of the edit interfaces command.

You can specify the MTU size for the GPIM interface. Junos OS supports an MTU value of 4474 bytes for the default value or up to 9192 bytes for maximum jumbo GPIM implementations.

Table 1 identifies network interface specifications for DS3 or E3 modes.

Table 1: 1-Port Clear Channel DS3/E3 GPIM Interface Options

Description

DS3 Mode

E3 Mode

Network Interface Specifications

Line encoding

B3ZS

HDB3

Framing

  • C-bit parity (default)

  • M23

G.751 (default)

Subrate and scrambling

Vendor algorithms supported:

  • Adtran

  • Digital Link

  • Kentrox

  • Larscom

  • Verilink

Vendor algorithms supported:

  • Digital Link

  • Kentrox

Network alarms

Supported in accordance with the ANSI specification:

  • Loss of signal (LOS)

  • Out of frame (OOF)

  • Loss of frame (LOF)

  • Alarm identification Signal (AIS)

  • Remote defect identification (RDI)

Supported in accordance with the ITU-T specification:

  • Loss of signal (LOS)

  • Out of frame (OOF)

  • Alarm identification signal (AIS)

  • Remote defect identification (RDI)

  • Phase- locked loop (PLL)

Error counters

Incremented during a periodic 1-second polling routine:

  • Line code violations (LCV)

  • P-bit code violations (PCV)

  • C-bit code violations (CCV)

  • Line errored seconds (LES)

  • P-bit errored seconds (PES)

  • C-bit errored seconds (CES)

  • Severely errored framing seconds (SEFS)

  • P-bit severely errored seconds (PSES)

  • C-bit severely errored seconds (CSES)

  • Unavailable seconds (UAS)

Incremented during a periodic 1-second polling routine:

  • Frame alignment error (FAE)

  • Bipolar coding violations (BCV)

  • Excessive zeros (EXZ)

  • Line code violations (LCV)

  • Line errored seconds (LES)

  • Severely errored framing seconds (SEFS)

  • Unavailable seconds (UAS)

HDLC Features

MTU

Default (4474 bytes) or maximum jumbo (up to 9192 bytes)

Default (4474 bytes) or maximum jumbo (up to 9192 bytes)

Shared flag

Supported

Supported

Idle flag/fill (0x7e or all ones)

Supported

Supported

Counters

Runts, giants

Runts, giants

See Also

Example: Configuring the 1-Port Clear-Channel DS3/E3 GPIM for DS3 Port Mode

This example configures the GPIM in the DS3 (T3) operation mode.

Requirements

Before you begin:

  • Install the device as specified in the SRX Series Services Physical Interface Modules Hardware Guide.

Overview

This example configures the basic T3 interface and modifies the framing to C-bit parity mode.

Topology

Configuration

Procedure

Step-by-Step Procedure

To configure the GPIM:

  1. Verify the installation, location, and status of the GPIM. In this example, the GPIM is installed in slot 8/PIC 0 and is currently online.

  2. Set the IP address for the logical interface.

  3. Set the MTU value to 9018.

  4. Set the framing mode.

  5. Enable the unframed DS3 mode.

  6. If you are done configuring the device, commit the configuration.

  7. To verify the configuration for your device, enter the following operational command:

Example: Configuring the 1-Port Clear Channel DS3/E3 GPIM for E3 Port Mode

This example modifies the default configuration for an E3 environment.

Requirements

Before you begin:

  • Install the device as specified in the SRX Series Services Physical Interface Modules Hardware Guide.

Overview

This example configures the basic E3 interface.

Topology

Configuration

Procedure

Step-by-Step Procedure

To configure the GPIM in E3 framing:

  1. Verify the installation, location, and status of the GPIM. In this example, the GPIM is installed in slot 8/PIC 0 and is currently online.

  2. Change to E3 port mode.

  3. Reset the MTU value to 3474.

  4. Enable the unframed mode.

  5. If you are done configuring the device, commit the configuration.

  6. To verify the configuration for your device, enter the following operational command:

Example: Configuring the 1-Port Clear-Channel DS3/E3 GPIM for M23 Mapping Mode

The following example configures the GPIM in DS3 with M23 mapping mode. Note that M23 mapping does not provide C-bit parity.

Requirements

Before you begin:

  • Install the device as specified in the SRX Series Services Physical Interface Modules Hardware Guide.

Overview

This example configures the basic T3 interface and modifies the framing to M23 mode without C-bit parity.

Topology

Configuration

Procedure

Step-by-Step Procedure

To configure the GPIM:

  1. Verify the installation, location, and status of the GPIM. In this example, the GPIM is installed in slot 8/PIC 0 and is currently online.

  2. Set the IP address for the logical interface.

  3. Set the MTU value to 9018.

  4. Set the framing mode.

  5. Disable C-bit parity for M23 mode.

  6. If you are done configuring the device, commit the configuration.

  7. To verify the configuration for your device, enter the following operational command: