Verilink PRISM 3010 Dual DSX-1 (34-00250.2) Product Manual - Manual (Page 16)

10 C HAPTER 3: T ERMINAL O PERATION
Loopbacks The following loopbacks can be invoked from the Maintenance screen.
Normal Operation
This diagram depicts the unit’s normal operating mode.
Figure 3-5 Normal Operation
NET LLB
The network line loopback command loops data received from the network back
toward the network. Received data is passed through to the DTE ports.
FAR LLB
The far line loopback command sends loop codes to the far-end unit to force it into
a network line loopback mode.
Figure 3-6 Network LLB
NET PLB
The network payload loopback command loops the network data back toward the
network. Framing, CRC, and FDL are regenerated. Framed all ones are passed to
the DTE ports.
FAR PLB
The far payload loopback command sends loop codes to the far-end unit to force it
into a network payload loopback mode.
Figure 3-7 Network PLB
Network Interface
To Network
From Network
RJ48C
Framer /Deframer Multiplexer Receivers /Drivers
Receivers /Drivers
BERT Generator/
Detector
DTE (EIA-530 or V.35)
(100' max.)
Framer /Deframer
DTE (DSX1)
RJ-48C
DSX1, 1'-655'
to cross-connect
From
NET
To
NET
To
NET
From
NET
5
4
2
1 To
Ports
From
Ports
5
4
2
1
Network Interface Framer/Deframer Multiplexer Receivers/Drivers
Receivers/Drivers
BERT Generator /
Detector
EIA-530 or V.35
(100' max.)
Framer /Deframer
DTE (DSX1)
RJ-48C
DSX1, 1'-655'
to cross-connect
From
NET
To
NET
To
NET
From
NET
5
4
2
1
To Network
From Network
RJ-48C
5
4
2
1 To
Ports
From
Ports
NET
LLB
Network Interface Framer/Deframer Multiplexer Receivers/Drivers
NET
PLB Receivers/Drivers
BERT Generator /
Detector
All ones
to DTE
EIA-530 or V.35
(100' max.)
Framer /Deframer
DTE (DSX1)
RJ-48C
DSX1, 1'-655'
to cross-connect
From
NET
To
NET
To
NET
From
NET
5
4
2
1
To Network
From Network
RJ-48C
5
4
2
1 To
Ports
From
Ports