4000 Router Series Interface Module Guide

Item S

nchronous

Supported services

• DDN leased line

• Terminal access service

• Dialup through

modems

• Backup

• Asynchronous

leased line

• Dumb terminal

access

Interface LEDs

Figure 89 HMIM-4SAE panel

Table 124 HMIM-4SAE LED description

LED Descri

tion

LINK

• OFF means no link is present.

• ON means a link is present.

ACT

• OFF means no data is being transmitted or received.

• Flashing means data is being received or/and transmitted.

Figure 90 HMIM-8SAE panel

On the HMIM-8SAE module, each link corresponds to a LED. The LED state indicates the link state as

follows:

• ON means connected link is present.

• Flashing means data is being transmitted or received.

• OFF means no data is being transmitted or received.

Interface cables and the connection methods

For more information about synchronous/asynchronous serial port cables, see

"Synchronous/asynchronous serial ports."

Voice interface module

• HMIM-2VE1

• HMIM-1VE1

• HMIM-1VT1

• HMIM-4FXS

• HMIM-4FXO

• HMIM-4E&M