CHAPTER 3 NDA-24296
Page 248
Revision 1.0
PA-8COTBJ
Central Office Trunk
Figure 3-41 Connecting Route Diagram
Table 3-1 Balancing Network and Terminal Impedance
Balancing Network Terminal Impedance
EIA/TIA 464-A
900Ω
CCITT Q. 517
AT&T Echo Test
Network
Note:
As illustrated above, two circuits (#0, #1) are required for connecting paging equipment.
• Cable Connections for Paging Equipment
PBX
Installation Cable
MDF
A0
B0
LT Connector
A
B
COT
PUBLIC
NETWORK
PBX
COT
-48V
G
FUSE
-48V
G
B
A
B1
A1
Installation Cable
MDF
LT Connector
A0
B0
G
Control Line
Speech Path
PAGING EQUIPMENT
• Cable Connections for a C.O. Line
0.21µF
1 k
Ω
350 Ω
2.16µF
600
Ω
600+2.16µ
900
Ω
2.16µF
900
Ω
0.05µF
100
Ω
800 Ω