Verilink HDM 2180 (880-503048-001) Product Manual Manuale Utente Scaricare il pdf (Pagina 12)

HDM 2180 DS3 DSU Overview

1-2 Verilink HDM 2180 User Manual

Local ASCII

Interface Port

The Local port provides the Craft interface for configuration,

control, and monitoring. A secondary function of this interface is

to provide a debug monitor port for troubleshooting.

This interface uses a 19.2 kbit/s rate and is asynchronous without

hardware flow control. The HDM 2180 Local port is RS-232

compliant for a front-panel RJ-11 connector.

SNMP Port

The front panel of the HDM 2180 provides an RJ-45 SNMP port for

direct Ethernet twisted-pair communication via Telnet. The HDM

2180 embedded SNMP supports SNMPv1 and is 10BaseT compliant.

Front Panel LEDs

Tri-color Network, Data Port, and System LEDs.

High-Speed Serial

Interface (HSSI)

Port

HSSI data port interface (DCE) for connection to DTE.

DS3 Network

Ports

Ω

coaxial TX and RX DS3 network ports.

Timing Options

The hardware supports three modes of system timing:

•

Internal—Reference timing derived from the free-running

internal oscillator

•

Network—Reference timing derived from the incoming DS3

data stream

•

External—75

Ω

female BNC connector accepts external timing.

The reference timing input accepts a TTL level DS3 rate clock.

Inband

Management

Channel

Specialized support is provided for the inband management

channel in C-bit parity applications. The three C-bits in M-subframe

5 of the DS3 frame are assigned as a 28.2 kbit/s terminal-to-

terminal path maintenance data link. The signal format used on

this data link consists of messages using the Link Access Procedure

on the D-channel (LAPD) protocol. A dedicated HDLC controller is

built into the hardware for this 28.2 kbit/s LAPD data link. The

controller supports polled, interrupt-driven operation.

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Verilink HDM 2180 (880-503048-001) Product Manual Manuale Utente Pagina 12

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