General DataComm 551 Operating And Installation Instructions page 23

INTRODUCTION
SITE A SITE B
DataComm 551 DataComm 551
T1
EQUIPMENT EQUIPMENT
CSU CSU
NETWORK
SUPERVISORY TERMINAL SUPERVISORY TERMINAL
FOR DataComm 551 AT SITE A FOR DataComm 551 AT SITE B
FIGURE 1-1. TYPICAL NETWORK, LOCAL TERMINAL CONTROL
SITE A SITE B
DataComm 551 DataComm 551
T1
EQUIPMENT EQUIPMENT
CSU CSU
NETWORK
MODEM MODEM
PUBLIC
SWITCHED
SERVICE CENTER
NETWORK
MODEM
SUPERVISORY TERMINAL
FOR BOTH DataComm 551s
FIGURE 1-2. TYPICAL NETWORK, REMOTE TERMINAL CONTROL USING MODEMS
1-7