CentreCOM Micro Repeaters
2-Port Fiber Optic/Twisted Pair Micro Repeaters
Features:
- IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible
- Switch-selectable for full or half repeater mode
- Straight-through (MDI) or crossed- over (MDI-X) connection switch for UTP RJ45 pin-out
- Internal power supply in MR128FT
- External power supply with the MR118FT
- Automatic segment partitioning and jabber lock-up protection
- Status and diagnostic LEDs
- Optional SMA 906 or ST type of fiber optic connectors
- Desktop, wall mount or 19 inch rack mount (with separate brackets) installation
- One year warranty
These CentreCOM Micro Repeaters are two-port media converters designed for the Fiber Link (FL/FOIRL) to Unshielded Twisted Pair (UTP) media marketplace. They allow for connection of a 10BASE-FL/FOIRL segment to a UTP (10BASE-T) segment.
Segments on either side of the unit support full length, fully repeated transmission and allow the maximum number of nodes specified by the IEEE. These media converters utilize state-of-the-art technologies including a custom Application Specific Integrated Circuit (ASIC) and Surface Mount Technology (SMT), which provide enhanced functionality, increased reliability and improved performance.
The CentreCOM Micro Repeaters provide the complete functionality of large repeaters including packet regeneration and network partitioning. The packet regeneration results in a higher performance network by regenerating preamble, retiming the data packets and extending collision fragments to ensure collision enforcement by all nodes.
The use of a custom ASIC and either an internal or external power supply makes the Allied Telesyn Micro Repeaters compact and easy to install. The units’ small size allows for the repeater function to be brought to the desktop or used in a wall mount installation.
Both the AT-MR118FT and AT-MR128FT have a selectable switch for full or half repeater mode. In the full repeater mode, each repeater counts toward the total repeater count specified by IEEE 802.3. In certain situations, (i.e. connections between buildings using the FL/FOIRL ports), fully repeated functionality is not needed. The half repeater mode allows a pair of repeaters to count as one repeater linking the two networks together.
Network diagnostic LEDs are provided on the front of the CentreCOM Micro Repeaters to aid in troubleshooting and fault isolation. Both segments have "Transmit," "Receive," "On Line" and "Collision" indicators, as well as "Link Integrity Test" LEDs. All units also have a "Power" LED.
Technical Specifications
| Front Panel Status Indicators | |
| Per Port: | |
| On Line | Indicates segment is not auto partitioned |
| Collision | Indicates collision detected on the repeater |
| Receive | Indicates a packet is being received from the segment |
| Transmit | Indicates a packet is being transmitted on the segment |
| Link | Indicates a valid link when illuminated |
| Central: | |
| Power | Indicates power is on |
| Packet Transmission Characteristics | ||
| Delay Times: | ||
| (Any segment in to other segment out) | ||
| Start of Packet | Collision to Jam | |
| (Maximum) | (Maximum) | |
| UTP to FO | 1950 ns | 2050 ns |
| FO to UTP | 1650 ns | 1350 ns |
| Preamble: | ||
| Input | Minimum of 38 bits including SFD | |
| Output | 64 bits including SFD (last 2 bits are 1,1) |
|
Jam Output: A pattern of 1,0 is sent to all segments when a transmit collision is detected. This pattern is also sent to the other segment when a receive collision is detected.
Packet Fragment Extension: 96 bits including preamble. Packet fragments are extended using the (1,0) data pattern.
Auto Partition/Reconnection: Each segment will partition itself from other segments if either 32 consecutive collisions occur or if a collision longer than 1 ms occurs. Reconnection occurs after data is transmitted or received without collision on partitioned port for 512 bit times (IEEE standard algorithm).
Jabber Lock-Up Protection: Packet output is momentarily interrupted for 96 bit times when packet transmission exceeds 64K bits.
| UTP Interface | ||
| Transmitter: | Typical | Worst |
| Peak Differential Signal Amplitude | 2.5 V | 2.2 to 2.8 V |
| Transmitter Jitter | ± 3.5 ns | |
| Harmonics Content | > 27 dB below fundamental |
|
| Common Mode Output Voltage | 4 V | |
| Silence Voltage | 0 | ± 50 mV |
| Link Test Pulse | 100 ns | 75 to 105 ns |
| Output Impedance | 100 ohm | 85 to 115 ohm |
| UTP Length | 100 meters | |
| Receiver: | ||
| Receiver Threshold | -400 mV | -300 to -585 mV |
| Differential Noise Rejection | 300 mV | |
| UTP Port: | ||
| Straight-through (MDI) or crossed-over (MDI-X) pin-out switch-selectable | ||
| Fiber Optic Interface | ||
| Typical | Worst | |
| Optical Wavelength | 850 nM | ±20 nM |
| Optical Saturation | 170 µW (-7.6 dBm) |
150 µW (-8.2 dBm) |
| Maximum Transmission Length | 2000 M | |
| Transmitter: | ||
| Output Power | ||
| 62.5/125 µM | -12.0 dBm | -15.0 dBm |
| 100/140 µM | -6.5 dBm | -9.5 dBm |
| 50/125 µM | -16.5 dBm | -19.5 dBm |
| Receiver: | ||
| Sensitivity | -32.5 dBm (0.5 µW) | |
| Saturation | -13 dBm (50 µW) |
-14 dBm (40 µW) |
| Bit Error Rate | Better than 10-10 | |
| Flux Budget: | ||
| Fiber Size | N/A | Typical |
| 62.5/125 µM | 0.27 | 13.5 dBm |
| 100/140 µM | 0.30 | 14.0 dBm |
| 50/125 µM | 0.18 | 9.0 dBm |
| Power Characteristics | |
| Input Voltage (Auto Ranging): | |
| AT-MR128FT | 100 to 240 VAC, 50/60 Hz, 0.25 A |
| Power: | 15 watts (Maximum) |
| Physical Characteristics | |
| Dimensions | |
| AT-MR128FT | 21.0 cm x 11.2 cm x 3.1 cm (8.3 in. x 4.4 in. x 1.2 in.) |
| AT-MR118FT | 14.0 cm x 11.2 cm x 3.1 cm (5.5 in. x 4.4 in. x 1.2 in.) |
| Weight | |
| AT-MR128FT | 480 grams (1 lb. 1 oz.) |
| AT-MR118FT | 284 grams (10.0 oz.) |
| Temperature | |
| Operating | 0° to 50° C |
| Storage | -20° to 60° C |
| Relative Humidity | 5% to 80% non-condensing |
| Electrical/Mechanical Approvals: | |
| EMI | FCC Class A |
| Safety | UL, CSA, TUV-GS, IEC 825-1 Class 1 |
| Ordering Information | ||
| Part Number | Port 1 | Port 2 |
| AT-MR118FT-X1 | SMA | RJ45 |
| AT-MR118FT-X3 | ST | RJ45 |
| AT-MR128FT-X1 | SMA | RJ45 |
| AT-MR128FT-X3 | ST | RJ45 |
| Where "X" = | 1 for 110V with U.S. power cord
included 2 for 220V without power cord included |
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