3com E3 Manual De Usuario

A-2

PPENDIX

A: T

ECHNICAL

PECIFICATIONS

Interface
Specifications

Console Port

Line A and Line B E3

Ports

Electrical Specification:

RS-232-C (EIA/TIA-232-E standard)

Connector:

RJ-45, 8 position modular jack

Configuration:

Data Terminal Equipment (DTE)

Transmission Method:

Unbalanced RS-232

Transmission Rate:

38,400 bps maximum

Electrical Specification:

E3 interface

Connectors:

BNC coaxial connectors; one transmit (TX) and
one receive (RX)

Transmission Media:

75 ohm (nominal impedance) coaxial cable

Timing Source:

User selectable between:

■

Internal

■

Network

Framing:

■

ATM Direct Mapping (ADM)

■

Physical Layer Convergence Protocol (PLCP)

Line Coding:

High Density Bipolar 3 Zeroes (HDB3)