Allied Telesis AT-MR111T User Manual page 9

Overview
CentreCOM™ Micro Repeaters are two-port media converters designed for
Ethernet coax and Unshielded Twisted Pair (UTP) network segments. The
product family includes a series with internal power supplies (AT-MR12x as
illustrated in Figure 1) and with external power supplies (AT-MR11x).
CentreCOM Micro Repeaters support full length segments on either side, fully
repeated transmission and the maximum number of nodes specified by the
IEEE. Repeating packets results in a higher performance network by
regenerating preamble, retiming the data packets and extending collision
fragments to ensure collision enforcement by all nodes.
CentreCOM
MR122T
IEEE 802.3 MICRO REPEATER
PORT 2
RJ45 PIN-OUT
MDI
10BASE-T
The AT-MR111T and AT-MR121T allow for connection of a UTP 10Base-T
Ethernet segment to a thick (10Base5) segment, and the AT-MR112T and
AT-MR122T allow for connection of a UTP 10Base-T Ethernet segment to a
thin (l0Base2) coaxial segment. Table 1 summarizes the product line.
Model Name
AT-MR111T
AT-MR112T
AT-MR113
AT-MR114
AT-MR115
AT-MR121T
AT-MR122T
AT-MR123
AT-MR124
AT-MR125
TM
POWER
PORT 1
TERMINATOR
OFF ON
MDI X
10BASE 2
Figure 1: AT-MR122T Front and Back Panels
Table 1: Two-Port Micro Repeater Models
Power Supply
External
External
External
External
External
Internal
Internal
Internal
Internal
Internal
COLLISION RECEIVE
ON LINE TRANSMIT
PORT 1: 10BASE2
TM
CentreCOM
MR122T
IEEE 802.3 MICRO REPEATER
Port 1
AUI
BNC
AUI
AUI
BNC
AUI
BNC
AUI
AUI
BNC
COLLISION RECEIVE
ON LINE TRANSMIT
PORT 2: 10BASE-T
POWER
Port 2
UTP
UTP
AUI
BNC
BNC
UTP
UTP
AUI
BNC
BNC
LINK
1