MODEL 2130 ELMC BRIDGE FIAL INCORPORATED 710 CENTER STREET OREGON CITY, OR 97045 503.607.1940 WWW.FIAL.
NOTICE OF FCC COMPLIANCE NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful interference when this equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communication.
Table of Contents BRIEF DESCRIPTION...................................................................................................................................................1 ELMC PROTOCOL BACKGROUND ...........................................................................................1 ELMC BRIDGE CHARACTERISTICS.........................................................................................3 LINEAR NETWORK MODE OF OPERATION...........................................................
BRIEF DESCRIPTION The model 2130 ELMC Bridge is a packet-data buffering and re-synchronizing device. It is used to interconnect Alcatel ELMC (Extended Link Monitoring and Control) data channels. The bridge has five ports which operate at 19.2 kilobits per second asynchronous RS-422. These ports may be connected to ELMC ports available on Alcatel 4000, 5606, 6000 and 8000 series radios.
communicate with other ELMC capable radios across a non-ELMC network. Any port on the bridge may be connected to a radio’s 19.2 kbps RS-422 asynchronous ELMC port. Any port on the bridge may be connected to a 56 or 64 kilobit synchronous channel bank card, or radio overhead channel, for backbone transport. Bridge ports will operate as low as 19.2 kilobits in synchronous mode. Such low rates are not recommended for backbones due to resulting traffic congestion.
ELMC BRIDGE CHARACTERISTICS The ELMC Bridge has five RS-422 data ports (DB-15F connectors) and one RS-232 serial craft interface (DB-9F connector). Each of the five data ports can be operated in one of the following two modes: 1. 19.2 kilobit, RS-422, Asynchronous, 8 data bits, no-parity, 1 stop bit. 2. 19.2 to 75 kilobit, RS-422, Synchronous, DTE (accepting transmit and receive clocks). The clock inputs for each data port are continuously monitored.
LINEAR NETWORK MODE OF OPERATION In linear network operation, all five data I/O ports can be used to bridge ELMC packet data. Ports that are connected to channel banks (for transport of ELMC data to remote locations) are automatically configured for synchronous operation. Ports connected to ELMC pins or jacks on Alcatel MDR-4000e, MDR-5606, MDR-6000, MDR-8000 and RDI-3100 series radios are automatically configured for 19.2 kilobit asynchronous operation.
slowest port (async) has finished sending its packet. Synchronous ports generally have some idle time while the 19.2 kbps ports are transmitting the packets. Transmission of each packet begins on all outgoing ports at the same time. SWITCH POLLS MODE: Switch Polls mode provides ‘switched bridging’ of poll packets, but not response packets. In Switch Polls mode, the bridge saves which ELMC remote addresses are associated with which 2130 Bridge data ports by using the response packet’s source address. 1.
SWITCH ALL MODE: Switch All mode provides ‘switched bridging’ of both poll and response packets. Polls are intelligently switched as in Switched Polls mode. The ELMC Bridge saves a history of the last 30 polls arriving at each port. It correlates responses with this information by matching type of poll to type of response, and poll address to response address. This correlation allows the software to build a table that contains the data ports associated with a particular poll and response pair.
As ELMC responses arrive at the bridge, the bridge enters the ELMC remote’s address and the associated data port into a table. This is called the port/address-binding table. Arriving poll packets have their destination address and poll type saved in a separate poll table. Poll table entries are kept for a maximum of 10 seconds. An arriving poll with an address that matches the value of a port’s port/address-binding table entry is only sent out that port.
SELECTIVE BRIDGING OPERATION Selective bridging allows the user to filter polls and answers for specific ELMC addresses on a port by port basis. The user is able to specify addresses for each port (up to twenty per port). If there are no addresses specified for a particular port, the port works as per the normal configuration settings (Hub, Switch Polls, or Switch All modes).
PERFORMANCE MONITORING The 2130 Bridge maintains the following 16-bit counters for each data port: Good packets received count Received packets with checksum errors count (header checksum and/or data checksum) All receive buffers full, packets tossed count Internal communication errors count Receive buffer overflow count (packet was too long) Good packets transmitted count Transmit packet underflow count Ring Fault count The port information displayed also includes the type of clocking (Asynchronous or Sync
INSTALLATION Install this unit in either 24 or 48 volt positive ground or negative ground stations. The factory default is for positive ground operation. Power is connected to a 2-terminal barrier strip at the rear of the unit, see Figure 4 and Figure 5 below. Figure 4. POSITIVE GROUND SYSTEM Figure 5. NEGATIVE GROUND SYSTEM There is an external chassis ground wire (jumper) that must be connected to the station ground terminal at the power input connector.
USE AS ASYNCHRONOUS PORTS All data ports operate at 19,200 bps when used for asynchronous ELMC communications. Two RS-422 differential pairs are used on each connector. The transmit data pair is pin 13 (+ lead) and pin 5 (- lead). The receive data pair is pin 10 (+ lead) and pin 2 (- lead). Asynchronous data timing is diagrammed below.
DTE synchronous data flow is diagramed below. Tx Data pin 5 (+ lead) No Data 0 1 2 3 4 5 6 7 No Data 0 1 2 3 4 5 6 7 pin 13 (- lead) Tx Clock pin 3 (+ lead) pin 11 (- lead) Rx Data pin 2 (+ lead) pin 10 (- lead) Rx Clock pin 1 (+ lead) pin 9 (- lead) CRAFT INTERFACE: The craft interface is typically used for a temporary connection to a PC serial COM port in order to configure the unit. A TTY terminal emulation program (e.g.
CRAFT PORT CONFIGURATION The following is a sample configuration menu for the ELMC Bridge using the rear panel craft port, at 19,200 baud, 8-data bits, 1 stop bit, no parity and no handshaking. The connection is straight through from the 2130 to a PC or laptop COM port. Main Menu ELMC Bridge model 2130 Rev 1.2m FIAL Incorporated Copyright (c) 2001 ----------------------------------------------------------------------- DTE ports check for TX and RX clock after reset.
MENU OPERATION 1) Specify an ELMC address for this bridge Specify an ELMC address for this bridge ----------------------------------------------------------------------5 characters only, no control characters allowed Enter new 5-character ELMC address: Use this menu option to specify the five character address for this bridge. The address is case sensitive, therefore ABC1X is a different address from abc1x. Only alphanumeric characters are allowed (no control characters).
more ports, depending on the bridging options below. This is true even if the packet has invalid header or data checksums, has an invalid poll type or is an incomplete fragment. However, an overly long packet that overruns an input buffer (158 characters) will be discarded.
4) Show Port Statistics Show Port Statistics ----------------------------------------------------------------------ELMC packet counts, cleared on reset, power-up, or manually.
asynchronous mode for any port in DTE synchronous mode. A minimum of 4 clock pulses per millisecond for transmit and receive clocks will keep a port in synchronous mode. The Ring Fault counters count the number of times this bridge has detected an ELMC ring integrity failure. In linear mode, these counters are inactive. For ring-master mode, the port 1 counter increments each time the ring-master detects a ‘fault’ ping from a slave and starts bridging action between ports 1 and 2.
Each ELMC address is exactly five alphanumeric characters long. ELMC addresses are case sensitive! Use option number six to manually force a clear of the detected addresses table. This table clears automatically once per hour. However performance counts are only cleared manually or upon reset. 6) Clear all port Statistics and ELMC address tables Use this menu option to manually force all performance monitoring counts and detected ELMC addresses back to zero.
8) Selective bridging tables Selective bridging tables ----------------------------------------------------------------------Port 1 ----------00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 Port 2 ----------00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 Port 3 ----------TEST0 TEST1 TEST2 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 0000
RING OPERATION For ring systems, Ports 1 and 2 MUST be used for the ring transport. Ports 3,4 and 5 are connected to local ELMC equipment on the ring and to ELMC radio spurs. When operating in ring mode, the bridge shows an additional line near the top of the main menu screen. The line shows one of two states for the master, and one of three states for a slave. This line displays 'Bridge State: M_Term’ for a ring-master with a normally function ring.
The following main menu example is for an ELMC Bridge configured as a Ring Master with an unbroken ring: ELMC Bridge model 2130 Rev 1.2m FIAL Incorporated Copyright (c) 2001 ----------------------------------------------------------------------Bridge State: M_term DTE ports check for TX and RX clock after reset. Ports use SYNCHRONOUS operation if 64 kilobit clocks are present. Otherwise, ports switch to RS-422 ASYNCHRONOUS at 19.
Saving changes with the craft interface causes the bridge to restart, dropping any traffic through the bridge for 8 seconds. When all bridges except the ring-master have been configured as ringslaves, the system is operating in ring mode. Recommended procedure to change from ring operation to linear. Make sure there are initially no breaks in the ring. The craft interface of the ring master should show Bridge State: M_Term on the craft interface main menu screen.
WINDOWS PROVISIONING PROGRAM A Windows provisioning program for PCs allows you to change basic configuration options and view the performance monitoring statistics. The Windows program can be operated in two ways: 1) Connection from PC COM port to ELMC Bridge craft port. Allows provisioning of only the locally connected ELMC Bridge. 2) Connection from PC COM port via RS-232/RS422 adapter to RS-422 ports one through five on the ELMC Bridge.
Port connection is for any of the five 15-pin D-sub connectors on the rear panel and must be used with an external RS-232 to RS-422 converter. The RS-422 Port connections may be used for accessing the local bridge or any remote ELMC Bridge. For either type selected, you must specify the PC’s COM port in the Settings dialog. Click the Settings button to open this dialog window and select the appropriate COM port number.
choose from the selections in the drop-down lists. Click the Send button to transfer and save the new parameters to the ELMC Bridge. Port Statistics are only available when using the RS-422 provisioning connection, or the TTY (HyperTerminal) serial craft port connection. The Refresh Stats button is disabled if the Windows Craft Port connection is selected. The Address to Poll/Provision entry field also only applies to the RS-422 provisioning connection and is disabled for Craft Port provisioning.
such by the target ELMC Bridge. Click on the Selective Bridging tab to view or edit the selective bridging address tables for the specified ELMC bridge. Select the port to view from the Get table for port drop down list, then press the Get button. The entries for the selected table will be displayed to the right.
MODEL 2130 ELMC BRIDGE SPECIFICATIONS PHYSICAL Height: 1 and 23/32 in. (1U) Width: 19 in. Depth: 11 in. Weight: 5.5 lbs. POWER REQUIREMENTS Supply Voltage: 18 volts to 56 volts, positive or negative ground Supply Current: 200 ma @18 volts Supply Fuse: internal 1 Amp 250 Volt 2AG fuse Connections: barrier terminal strip - rear panel ELMC PORT CONNECTORS: There are five DB-15 female ELMC data port connectors. Each data port is DTE (accepts clock).
RS-422 ASYNCHRONOUS SIGNALS: • Idle condition: + data line is more positive than the - data line during the inter-packet interval. • 8 data bits, 1 stop bit, no parity, no handshake • At the end of each packet, a pause of two character times (idle or mark condition) is enforced before starting transmission of the next packet. ELMC ports receive-data input termination: 121 Ohms differential: (+ data input biased to +5 with 1K ) (- data input biased to gnd.
ELMC BRIDGE CONNECTOR PIN ASSIGNMENTS ELMC RS-422 SYNCHRONOUS DATA PORT CONNECTIONS: Signal Name Pin # (+ lead) Pin # (- lead) Receive Clock Receive Data Transmit Clock Return Clock Transmit Data 1 2 3 4 5 9 10 11 12 13 TABLE 1 PIN ASSIGNMENT (DB-15F) ELMC RS-422 ASYNCHRONOUS DATA PORT CONNECTIONS: Signal Name Pin # (+ lead) Pin # (- lead) Receive Data Transmit Data 10 13 2 5 TABLE 2 PIN ASSIGNMENT (DB-15F) ELMC RS-232 ASYNCHRONOUS CRAFT PORT CONNECTIONS: Signal Name Data out from 2130 to P
Alcatel 4000, 5606 series radio, async ELMC connections, 19.2 kilobits Cable must be wirewrapped at radio end, DB15 Male at bridge end.
Channel Bank RS-530 Interface (using a DB25 connector) PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 SIGNAL SHIELD TRANSMITTED DATA A RECEIVED DATA A REQUEST TO SEND A CLEAR TO SEND A DCE READY A GROUND RECEIVED LINE SIGNAL DETECTOR A RECEIVE CLOCK B RECEIVED LINE SIGNAL DETECTOR B TERMINAL TIMING CLOCK A TRANSMIT CLOCK B CLEAR TO SEND B TRANSMIT DATA B TRANSMIT CLOCK A RECEIVE DATA B RECEIVE CLOCK A LOCAL LOOPBACK REQUEST TO SEND B DTE READY A REMOTE LOOPBACK DCE READY B DTE READY
Channel Bank RS-449 Interface (using a DB37 connector) PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 SIGNAL SHIELD SIGNAL RATE INDICATOR NOT USED SEND DATA A SEND TIMING A RECEIVE DATA A REQUEST TO SEND A RECEIVE TIMING A CLEAR TO SEND A LOCAL LOOPBACK DATA MODE A (DSR) TERMINAL READY A (DTR) RECEIVER READY A (DCD) REMOTE LOOPBACK INCOMING CALL (RI) SIGNAL RATE SELECTOR TERMINAL TIMING A TEST MODE SIGNAL GROUND RECEIVE COMMON NOT USED SEND DATA B
RS-449 NOTE: If you cannot strap or configure your channel bank card for a clear channel (always transmitting and receiving), or if this is not the default, then you will have to jumper additional lines together in the RS-449 plug. You may have to interconnect wires on the RS449 connector so that REQUEST TO SEND (A and B) is always asserted, in other words, the SEND DATA (A and B) is always being transmitted.
Channel Bank V.
Typical Data Port Interface 1 2 4 3 F F Typical for Ports 1 through 4 (DTE only) D18 E L19 L18 1 L17 1 L16 1 EMIFLT 3 EMIFLT 3 3 EMIFLT 3 D16 L15 1 121 1% RXC0+ 7 RXC0- 6 R11 1K RXD0+ 1 RXD0- 2 Data stable on rising edge 3 D17 EMIFLT 3 EMIFLT 3 VCC + 1K R8 U7B 75175 TXC0+ 9 TXC0- 10 D14 11 /TXC0 Data stable on rising edge D15 P6KE7.5CA P2A C14 3.3UF 16V TANTTEH 121 1% D /RXD0 Inverted Data VCC 121 1% R9 R10 P6KE7.5CA P6KE7.
1 2 4 3 F F Port 5 Only (DTE or DCE operation) D75 1 L74 1 EMIFLT 3 EMIFLT 3 L73 1 L72 1 EMIFLT 3 EMIFLT 3 P6KE7.5CA P6KE7.5CA R59 2 1 6 5 L71 1 EMIFLT 3 EMIFLT 3 U30B 75175 P6KE7.5CA U29A 75174\SO20L TXC4+ 9 TXC4- 10 121 1% R54 Return CLK 15 13 9 8 P6KE7.5CA 14 1 D69 L69 P6KE7.5CA 1 3 EMIFLT L68 1 3 EMIFLT 64KCLK 2 P6KE7.
