Technician’s Handbook
84
Table 10: A-B Signalling States (Tie/E&M)
PBX Port
Type
CSU
Type
PBX port
condition to
channel
Transmit Receive CSU condition to
analog facility
A
B
A
B
Tie Trunk
(loop start)
DPO Tx loop open
0
0
x
x
x
loop closure
1
1
x
x
x
DPO Rx x
x
x
0
x
normal battery
x
x
x
1
x
reverse battery
DID or Tie
Trunk
(loop start)
DPT Tx
normal battery
0
0
x
x
x
reverse battery 1
1
x
x
x
DPT Rx x
x
x
0
x
loop open
x
x
x
1
x
loop closure
TIE Trunk
4wire/2
wire E&M
E&M Tx M-lead
grounded or
open
0
0
x
x
x
M-lead battery
1
1
x
x
x
E&M Rx x
x
x
0
x
E-lead open
x
x
x
1
x
E-lead grounded
or open
Summary of Contents for SX-200 EL
Page 1: ...TECHNICIAN S HANDBOOK LIGHTWARE 19 RELEASE 3 0 ...
Page 11: ...Chapter 1 Introduction ...
Page 12: ......
Page 32: ...Technician s Handbook 22 ...
Page 33: ...Chapter 2 Routine Maintenance ...
Page 34: ......
Page 55: ...Chapter 3 Troubleshooting and Repair ...
Page 56: ...Technician s Handbook 46 ...
Page 88: ...Technician s Handbook 78 Figure 16 E M Trunk Type I 2 wire ...
Page 110: ...Technician s Handbook 100 ...
Page 111: ...Chapter 4 Programming ...
Page 112: ......
Page 168: ...Technician s Handbook 158 ...
Page 169: ...Chapter 5 Installation ...
Page 170: ......
Page 239: ...Chapter 6 Maintenance Commands ...
Page 240: ......
Page 258: ...Technician s Handbook 248 ...
Page 261: ...Notes ...
Page 262: ...Technician s Handbook Notes ...