Enterasys Networks X-PeditionTM T1/E1 Subsystem Configuration, T3/E3 Subsystem Configuration

Features

•Line rate - 34.368 Mbps

•Full rate - 34.0995 Mbps (G751)

•Sub-rate - approximately 3 Mbps increments up to 33 Mbps

•Compatible DSUs supported

–Cisco or Quick Eagle (formerly Digital Link) DL3100 E3 -300-33.920 Kbps

–ADC Kentrox T3/E3 IDSU

•Scrambling - Cisco mode only

•Performance Monitoring Local Network Port Statistics - Per RFC-2496- Current 15-minute, 24- hour (96 *15-minute intervals) and total for 24 hours

T1/E1 Subsystem Configuration

Each T1/E1 physical port is represented as a T1 or E1 controller. This is valid for both full rate T1/ E1 mode and fractional/channelized modes. Each T1/E1 physical port (line) can be configured to run in one of the following modes:

•Full rate T1/E1 mode - full T1/E1 line bandwidth is used by one user

•Fractional T1/E1 mode - only one Channel Group is assigned to one T1/E1 physical line

•Channelized T1/E1 mode - more than one Channel Group is assigned to one T1/E1 physical line

For both fractional and channelized configurations, each configured Channel Group, which might contain individual timeslots or ranges of timeslots, uses only one of the available logical channels. All configured T1/E1 lines are recognized by the system software as serial interfaces. That implies that all of the available configuration procedures for interfaces are applicable. Each of the serial interfaces can be configured to carry data traffic with PPP encoding.

T3/E3 Subsystem Configuration

Each T3/E3 physical port is represented as a T3 or E3 controller. This is valid for both full and sub- rate T3/E3 modes. Un-channelized or “unformatted” service creates a point-to-point connection between your network equipment and that of the service provider. The T3/E3 WAN transmission line can be provisioned as follows:

•Full rate service is covered by national and international standards. Only one data stream at full data rate is sent over the T3/E3 line.

–T3 - 44.2Mbps payload, Framing DS3 ANSI T1.107

–E3 - 33.920 Mbps payload, Framing G.751.

The entire bandwidth of the line is used to pass Frame Relay or PPP data. Frame Relay service can be provisioned in a number of ways, e.g., measured T3 service provides an unlimited (burstable) T3 with charges based on bandwidth used.

•Sub-rate service includes no standards. It is provisioned by T3 or E3 DSUs which transmit only one data stream at a reduced rate. Supported rates are DSU-specific. Data rates are:

–T3 - 1 to 35 MHz in 0.5MHz steps

–E3 - 1 to 24.5 MHz in 0.5MHz steps

Sub‐rate T3/E3 DSUs include: Digital Link, Kentrox, Adtran, Verilink and Larscom.

XSR User’s Guide 4-3