NDA-24296 CHAPTER 3
Page 585
Revision 1.0
PA-24PRTB-A
Primary Rate Interface Trunk
5. Switch Settings
Standard settings of switches on this circuit card are shown in the table below.
SWITCH
NAME
SWITCH
NO.
SETTING
STANDARD
SETTING
MEANING
MB UP Circuit card make busy
DOWN
×
Circuit card make busy cancel
MODE 5 AT&T (#4/#5 ESS)
7 NT DMS 100/DMS 250
10 Q-SIG. (ETS 300 172)
LB
0
ON Internal loop back set
OFF
×
Internal loop back cancel
1
ON Line loop back set
OFF
×
Line loop back cancel
2
ON Payload loop back set
OFF
×
Payload loop back cancel
3
ON D-channel Handler (DCH) make busy request
OFF
×
D-channel Handler (DCH) make busy request cancel
SW0
1
ON
×
Impedance 100
Ω
OFF Impedance 110
Ω
2
ON Send transformer middle point Ground
OFF
×
Send transformer middle point Open
3
ON Receive transformer middle point Ground
OFF
×
Receive transformer middle point Open
4ON
×
Fixed