Technical Documentation

SRX650 Services Gateway Quad T1/E1 GPIM Overview

A Gigabit-Backplane Pluggable Interface Module (GPIM) is a network interface card (NIC) that installs in the front slots of the services gateway to provide physical connections to a LAN or a WAN. The GPIM receives incoming packets from a network and transmits outgoing packets to a network.

The Quad T1/E1 GPIM provides the physical connection to T1 or E1 network media types and also performs T1 or E1 framing and line-speed signaling.

    Caution: GPIMs are not Online Insertion and Removal (OIR) capable. You must power off the services gateway before removing or inserting a GPIM. Ensure that the GPIM is installed in the appropriate GPIM slot before powering on the services gateway.

    Figure 1 shows the Quad T1/E1 GPIM:

    Figure 1: Quad T1/E1 GPIM

    Image g032730.gif

    The Quad T1/E1 GPIM provides the following common key features for both T1 and E1 modes:

    • HDLC operating mode supports 56 Kbps and 64 Kbps
    • Independent internal and external clocking option
    • Alarm reporting with 24-hour history
    • MTU supports 9K bytes

    The Quad T1/E1 GPIM provides the features specific to T1 or E1 modes listed in Table 1.

    Table 1: Quad T1/E1 GPIM Specific T1 or E1 Features

    Description

    T1 Mode

    E1 Mode

    Operation modes

    • Framed clear channel
    • Fractional operation mode supports flexible configuration for time slots (numbered 1-24)
    • Framed clear channel (64 Kbps)
    • Unframed clear channel
    • Fractional operation mode supports flexible configuration for time slots (numbered 0-31)

    Framing

    • Superframe (D4/SF)
    • Extended Superframe (ESF)
    • G704
    • G704 with no CRC4
    • G703 Unframed

    Line encoding

    • B8ZS
    • AMI
    • HDB3

    Updated: 2009-04-23