Instruction manual

RIC-E3/ETH, RIC-T3/ETH Installation and Operation Manual Chapter 1 Introduction
Technical Specifications 1-5
Ethernet Interface
The Ethernet interface includes a high performance self-learning Ethernet bridge,
which is connected to the LAN via a single 10BaseT or 100BaseT port, operating in
half or full duplex.
The module automatically learns MAC addresses of the LAN to which it is
connected. Its LAN table stores up to 1,000 addresses with 5-minute automatic
aging.
Filtering and forwarding is performed at the maximum theoretical rate of 150,000
frames per second (wire speed). The bridge has an internal buffer for frames that is
16Kx32 (64 KB). The forwarding of the broadcast and multicast messages from
LAN to WAN can be disabled.
Timing
Figure 1-5 shows flow of the clock signals in the RIC-E3/ETH and RIC-T3/ETH unit.
Two timing modes are supported:
• Receive clock: the system timing is locked to the recovered receive clock
signal coming from E3/T3 interface.
• Internal clock: an onboard crystal oscillator (±25 ppm) serves as the timing
source for the system.
Alarm Relay
RIC-E3/ETH and RIC-T3/ETH feature an alarm port, used for the relay of the alarm
conditions (AIS and LOW) by means of Normally Open and Normally Closed dry
contacts, using different pins of the DB-9 port connector.
1.4 Technical Specifications
E3/T3
Interface
Transmission Rate
• E3: 34.368 Mbps
• T3: 44.736 Mbps
Line Code
• E3: HDB3
• T3: B3ZS
Impedance
75Ω, unbalanced
Connectors
Two shielded BNC (unbalanced)
Ethernet
Interface
LAN Table
1,000 MAC addresses
Aging
5 minute, automatic
Filtering and
Forwarding Rate
150,000 frames per second
Buffer Size
170 frames