Verilink PRISM 3000 (34-00184) Product Manual User Manual
Page 37
Terminal Operation
4-9
PRISM 3000
DTE MLB
Network Interface
Framer /Deframer
Multiplexor
Receivers /Drivers
Receivers /Drivers
BERT Generator /
Detector
EIA530 or V.35
(100' max.)
Framer /Deframer
DTE (DSX1)
RJ48C
DSX1, 1'- 655'
to cross-connect
From
NET
To
NET
To
NET
From
NET
5
4
2
1
To Network
From Network
RJ48C
5
4
2
1
To
Ports
From
Ports
DTE
MLB
DTE LLB
Network Interface
Framer /Deframer
Multiplexor
Receivers /Drivers
Receivers /Drivers
BERT Generator /
Detector
EIA530 or V.35
(100' max.)
Framer /Deframer
DTE (DSX1)
RJ48C
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
RJ48C
5
4
2
1
To
Ports
From
Ports
6
5
Port Loop (bidirectional)
Network Interface
Framer /Deframer
Multiplexor
Receivers /Drivers
Receivers /Drivers
BERT Generator /
Detector
EIA530 or V.35
(100' max.)
Framer /Deframer
DTE (DSX1)
RJ48C
DSX1, 1'- 655'
to cross-connect
To
NET
From
NET
From
NET
To
NET
5
4
2
1
To Network
From Network
RJ48C
5
4
2
1
To
Ports
From
Ports
DTE
Near/Far
7
3)
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.
4)
NET MLB: The network ‘maintenance loopback’ com-
mand loops data at the T1 DTE port back toward the net-
work (passes network data to the DTE and return data to the
network). MLB affects only network channels assigned to
the T1 DTE.
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 net-
work. It is advisable to set ‘
T1-NET
Timing
’ to ‘
INTER-
NAL
’ 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 pay-
load loopback mode.
FAR LLB: The far ‘line loopback’ command sends loop
codes to the far end unit to force it into a network line loop-
back mode.
7)
Port Loop: This field is used to loop a high speed
DTE port at the near or far end. High speed port loops are
bidirectional.