Verilink PRISM 3010 Dual DSX-1 (34-00250.2) Product Manual - Manual (Page 17)

Maintenance Screen 11
NET MLB
The network maintenance loopback command loops data at the T1 DTE port back
toward the network (passes network data to the DTE and return data to the
network). MLB affects only network channels assigned to the T1 DTE.
Figure 3-8 Network MLB
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.
Figure 3-9 DTE MLB
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.
Figure 3-10 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
NET
MLB
To Network
From Network
RJ-48C
5
4
2
1 To
Ports
From
Ports
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
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