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Page 10 of 12
AMG3788ERN-DR-1550-HP
Instruction Sheet D16678-00
Ethernet Operation
In order for the 3700 unit to transmit Ethernet signals, the X16003 Ethernet interface should be fitted to all
units in the ring. This is supplied as standard in the
AMG3785, AMG3786
and
AMG3787
type units.
When all the Ethernet interfaces around the ring are operating at 100Mbit/s full duplex the system behaves
as a multi-port repeater. Data transmitted on any one port is transmitted out on all other ports with the
minimum of delay or buffering. The bandwidth available for transmission within the ring is nominally
100MBit/s. If one node is transmitting, all this bandwidth is available for this traffic. If multiple nodes transmit
simultaneously on the ring, then the bandwidth shares between each node as required. With similar traffic at
each node the sharing would be nominally equal. Although the limit for the number of video channels which
can be transmitted around the ring is eight, up to 64 nodes can be attached for distributing Ethernet signals
with the bandwidth sharing implemented. The units use Flow Control (Pause Frames) to limit the access to
the ring to share the bandwidth and to ensure that no data is lost.
When an Ethernet port is operating at 10Mbits/s half duplex, this port will now only receive data from a 3700
receiver unit rather than all ports as when operating at 100Mbits/s full duplex.
The 100baseT port does not implement MDI/MDIX; it should be connected with a straight tho ugh cable to an
external switch port and with a cross over cable when connected directly to a PC or DTE.
Physical Information
Dimensions
Height .................................................. 3U Plug-in
Width.................................................... 21HP
Depth ................................................... 172mm excluding connectors
Weight.................................................. 1200grams
Mounting Details
The unit is designed to be mounted within an
AMG2005
Subrack on standard card guides. Note the
AMG2005
Subrack is supplied with guide rails every 14HP. In order to fit this unit in the subrack it may be
necessary to move some card guides by pulling gently on the card guides .
Removal/replacement from/to the Case
Note:
The 3700 series PCB’s are static sensitive. Handle with proper care and use normal electrostatic
discharge (ESD) procedures. Use properly grounded protection (for example, wrist stamps) when handling
the PCB.
To remove units from the case to access the data expansion board and the daughter boards, remove the 4
fixing screws on the rear panel and slide the PCB’s out of the case. Ensure that the fibres do not snag or get
trapped.
To replace the PCB’s into the case, slide the PCB’s gently into the case aligning the boards with the
appropriate slots. Ensure that the fibres do not snag or get trapped.
The Management Interface
The AMG3700 Management Interface is fitted within AMG3784RN, AMG3786RN and AMG3788RN
receivers and is signified by a ‘N’ in the part number
Each management interface, thus each receiver, has an ID number with is identified below the management
port. This ID number is used by the AMG Network Management System (NMS) to identify the unit.
The physical interface is a 9 way female D-type connector.
