Cabletron Systems CSMIM-T1 manual 4 T-1 Network Access, Network Status / Alarms

Chapter 1: INTRODUCTION

1.6.4T-1 Network Access

There are two ports on the front panel that allow access to the T-1 network. The T-1 Network Interface Port is an 8-pin, RJ48C port that provides access for the digital T-1 line. The Drop/Insert Interface is also an 8-pin, RJ48C port, and provides connection to a local Private Branch Exchange (PBX), or other equipment, such as an ETWMIM equipped with a T-1 interface.

In addition to these ports, there are 8 Status LEDs that provide the user with valuable information regarding the T-1 network.

DI SYNC

The green DI SYNC LED is ON when the T-1 engine is detecting frame synchronization on the Drop and Insert Interface. The LED is off when there is a Loss of Frame (LOF) synchronization.

An LOF condition causes the T-1 engine to transmit all unframed ones (keep alive signal) to the device attached to the Drop and Insert Interface.

ON LINE LED

The green ON LINE LED is ON when the T-1 engine is connected to the network interface.

1.6.5NETWORK STATUS / ALARMS

TEST - Network Test

This red indicator is ON when the T-1 engine network interface is placed into a test loopback condition. Loopback tests are activated either locally by the user, or by the telco provider.

SYNC - Synchronized

This green indicator is ON when the T-1 engine is properly synchronized with the network signal and is receiving proper framing information.

LOS - Loss of Signal

This red indicator is ON when the T-1 engine is detecting no signal (pulses) on the network interface receiver. When a LOS condition exists the T-1 engine transmits unframed all ones (Alarm Indication Signal) to the network.

1-8 CSMIM-T1 Hardware Installation Guide