363-206-305
Circuit Pack Descriptions
7-24
Issue 3 June 2000
Figure 7-10. DS1PM Circuit Pack Block Diagram
Control Circuitry
7
The DS1PM circuit pack interfaces with the SYSCTL over the intrashelf control
bus. Redundancy in the intrashelf control bus assures the level of control required
to perform protection switching and alarming of a faulty circuit pack. The DS1PM
provides maintenance elements for reporting the status of the circuit pack and the
incoming VT1.5 and DS1 signals, as well as the circuit pack inventory information
(
CLEI
code, date of manufacture, etc.). These maintenance elements are used by
the SYSCTL for fault detection and isolation. The DS1PM responds to control
signals from the SYSCTL for functions including protection switching. The framer
circuit acquires frame information (either SF or ESF) from the DS1 signal and
sends the information to the PM processor. The PM processor collects information
from the framing circuitry and generates near-end and far-end (ESF only) DS1 PM
parameters. When provisioned for DS1 clear channel, no PM path parameters are
generated.
VT 1.5
VT-G
Timing
LBO
Adds (Removes)
LBO
Processor
Adds (Removes)
DS1 #3
DS1 #4
Prot. Sw.
Bus
To/From
LBO
DS1 to VT 1.5
Processor
Adds (Removes)
VT OH
LBO
DS1 to VT 1.5
Processor
Adds (Removes)
VT OH
DS1 to VT 1.5
Processor
VT OH
To/From
DSX-1
VT OH
VT 1.5
VT 1.5
VT 1.5
VT 1.5
DS1 #1
DS1 #2
Prot. Sw.
Bus
To/From
Loopback
Loopback
Loopback
Prot. Sw.
Bus
To/From
Byte
Interleave &
(Disinterleave)
Control
+5V Power
To/From
SYSCTL
Circuit Pack
Prot. Sw.
Bus
To/From
Intrashelf
DS1 to VT 1.5
Loopback
Framer
Framer
Framer
Framer
To PM Processor
To PM Processor
To PM Processor
To PM Processor
PM Processor
From
Framers
To/From
OLIU CPs
(Service &
Protection)
From
OLIU CPs
(Service &
Protection)
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