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.
Figure 1:
AT-MR122T Front and Back Panels
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.
Table 1:
Two-Port Micro Repeater Models
Model Name Power Supply Port 1 Port 2
AT-MR111T External AUI UTP
AT-MR112T External BNC UTP
AT-MR113 External AUI AUI
AT-MR114 External AUI BNC
AT-MR115 External BNC BNC
AT-MR121T Internal AUI UTP
AT-MR122T Internal BNC UTP
AT-MR123 Internal AUI AUI
AT-MR124 Internal AUI BNC
AT-MR125 Internal BNC BNC
POWER
CentreCOM
TM
MR
122T
IEEE 802.3 MICRO REPEATER
PORT 1: 10BASE2
ON LINE
COLLISION
TRANSMIT
RECEIVE
ON LINE
COLLISION
TRANSMIT
LINK
PORT 2: 10BASE-T
RECEIVE
10BASE-T
PORT 2
POWER
10BASE 2
PORT 1
CentreCOM
TM
MR
122T
IEEE 802.3 MICRO REPEATER
OFF ON
TERMINATOR
RJ45 PIN-OUT
MDI MDI X
1
MR11x/MR12x.4Web Page 9 Monday, February 24, 1997 11:33 AM
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