Verilink PRISM 3030 (34-00208.L) Product Manual - Manual (Page 69)

Maintenance Screen 59
5 DTE MLB: The T1 DTE maintenance loopback command loops all network data
back toward the DTE ports at the network interface. Data is passed through to the
network. It is advisable to set T1-NET Timing to INTERNAL rather than
NETWORK when this loop is enabled.
6 DTE LLB: The T1 DTE line loopback command loops data received at the T1
DTE interface back toward the T1 DTE (all DS0s are returned to the T1 DTE
port). The T1 DTE data is also passed to the network.
FAR PLB: The far payload loopback command sends loop codes to the far-end
unit to force it into a network payload loopback mode.
FAR LLB: The far line loopback command sends loop codes to the far-end unit to
force it into a network line loopback mode.
7 Port Loop: Used to loop a high-speed DTE port at the near or far end. High-speed
port loops are bidirectional.
DTE MLB
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
DTE
MLB
DTE LLB
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
T1 DTE
LLB
To Network
From Network
RJ-48C
5
4
2
1 To
Ports
From
Ports
6
5
Port Loop (bidirectional)
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
To
NET
From
NET
From
NET
To
NET
5
4
2
1
To Network
From Network
RJ-48C
5
4
2
1 To
Ports
From
Ports
DTE
Near/ Far
7
Figure 4-8 Loopback Diagrams