General DataComm 551 Operating And Installation Instructions page 39

NEW YORK
DATA
CHANNEL
MUX
LEGEND
NE= NETWORK ELEMENT
P= PCL PORT
S= SUPERVISORY PORT
M=MODEM PORT
NEW YORK
MUX
LEGEND
NE= NETWORK ELEMENT
P= PCL PORT
S= SUPERVISORY PORT
M= MODEM PORT
FIGURE 2-5. OUT-OF-BAND COMMUNICATION PATH
PRIMARY ROUTE FOR
DIAGNOSTICS VIA T1
NE
DataComm
551
485
BUS
PMC-100
M
P
MASTER
S
SUPERVISORY TERMINAL
FIGURE 2-4. IN-BAND COMMUNICATION PATH
PRIMARY ROUTE FOR
DIAGNOSTICS HAS FAILED
NE
DataComm
551
485
BUS
PMC-100
M
MODEM
P
MASTER
S
SUPERVISORY TERMINAL
T1
DataComm
PMC-100
M
SLAVE
P
DIAL BACKUP FOR
T1 LINK FAILURE
T1
MODEM
SWITCHED NETWORK
INSTALLATION
BOSTON
NE
551
MUX
485
BUS
S
NE
DataComm
551
485
BUS
PMC-100
S
M
SLAVE
P
DATA
CHANNEL
BOSTON
MUX
2-13