CHAPTER 3 NDA-24296
Page 468
Revision 1.0
PA-24CCTA
Commo n Channel Trunk
5. Switch Settings
Standard settings of switches on this circuit card a re shown in the table below.
Figure 3-139 Available Locations for Loopback Testing
SWITCH SWITCH
NO. SETTING STANDARD
SETTING MEANING
SW00/MB UP Circuit card make busy
DOWN ×Circuit card make busy c ancel
SW01/13B
0
ON
OFF ×
1
ON
OFF ×
2
ON
OFF ×
3
ON
OFF ×Note: For more information on loopback, se e below.
SW01/SW13B Internal
Loopback
CCH
Control
MBR
CCH
Loopback
03
ON ON —— ×
OFF ON ×
ON OFF ×——
OFF OFF ———
SW01/SW13B External
Loopback Payload
Loopback All Circuit
MBR
12
ON ON —— ×
OFF ON ×
ON OFF ×——
OFF OFF ———
Switch
TSW Interface
PAD
Speech Path
Control Block
Framer
Line Interface
NETWORK
External Loopback
(Line Loopback)
Payload Loopback
Internal Loopback
PA-24CCTA
R
T

As illustrated below, loopback testing can be performed at three locations on this card.