Verilink 1558D (34-00255) Product Manual - Manual (Page 26)

Operation 3-10 1558D APS CSU/DSU
B
NET
Power
COM Bus
Rx
Supply ±12 VDC
+5 VDC
Tx
Line
Deframer
NET A
Framer
Loop
Line
Protection
Fac/Local
Loop
PLB
APS
Select
Path A/B
Bridge
Jack
Receive
Jack
NET A
Bridge
Jack
Transmit
Jack
A
RJ-48
Line
Protection
NET
Rx
Tx
Line
Deframer
NET B
Framer
Loop
Line
Protection
Fac/Local
Loop
PLB
Bridge
Jack
Receive
Jack
NET B
Bridge
Jack
Transmit
Jack
B
RJ-48
Line
Protection
Eq/V.54
Loop
Signal
Split
A
ROM
RAM
CPU
Loop
Set/Reset
SUPV
Port
Performance History,
Alarms, Unit Address
OUT
COM Bus
IN
Alarm
Contacts
(COM,
NO, NC)
BERT: QRSS,
1:8, 3:24, etc.
NET B
NET A
V.35 Interface
SD
RD
Tx Clk
Ext Clk
RTS
CD
DSR
TM
Rx Clk
AC Input, 110 VAC
Figure 3-4 1558D APS CSU/DSU Block Diagram