FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 )
FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 ) are managed access units that can be used as rate and interface converters for E1/T1 and fractional E1/T1 services. FCD-E1L and FCD-T1L support a single- or dual-serial n × 64 kbps data user interface. Instead of a serial data interface port, an Ethernet LAN interface can be ordered, allowing LAN-to-LAN connectivity over TDM media. FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 ) operates with RAD's modular DXC (DACS) products, as well as E1/T1 equipment of other vendors, to support multilink star applications, such as access to SDH networks. The DXC and FCD units can be managed with centralized SNMP network management. The E1 interface is compatible with virtually all carrier-provided E1 services and meets ITU recommendations G.703, G.704, G.706, G.732, G.823, and G.826.
FCD-E1L ( FCD-E1L/U/AC/V35 ) supports both 2 and 16 frames per multiframe, with or without CRC-4. It can also accept a 2048 kbps data stream and convert it to an ITU-T Rec. G.703 unframed signal for transport over the E1 main link. Line code is HDB3. The software-selectable integral LTU provides a range of up to 2 km (1.2 miles).
The T1 interface of the FCD-T1L ( FCD-T1L/AC/V35 ) is compatible with virtually all carrier provided T1 services, including ASDS from AT&T and complies with TR-62421. The T1 interface supports D4 and ESF framing formats. Zero suppression over the line is selectable for either transparent, B7ZS, or B8ZS coding. The software-selectable integral CSU ensures a range of up to 2.1 km (1.3 miles).
Programmable timeslot assignment allows data from each data port to be placed automatically into consecutive timeslots. Alternatively, timeslots can be assigned manually at user discretion.
FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 ) feature autoconfiguration for plug-and-play connectivity. Upon connection to the E1/T1 link, the units detect the E1/T1 parameters and perform autoconfiguration accordingly. This E1/T1 learning process can be activated via either a push-button on the FCD-E1L/FCD-T1L front panel or a terminal command. The state of the learning process is monitored by a dedicated LED indicator and/or supervision terminal messages.
Multiple clock source selection ensures maximum flexibility to support different applications. The E1/T1 main link may be timed from an internal oscillator, the recovered receive clock, or one of the data ports.
Front panel LEDs indicate alarms, an E1/T1 signal loss condition, and diagnostic loopback operation.
Rear panel LEDs on the Ethernet interface modules indicate activity and status of the LAN.
FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 ) are compact standalone units. A rack mount adapter kit enables installation of one or two (side-by-side) units in a 19-inch rack (see
Ordering section of data sheet).
FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 ) User
interfaces support the following types of user interfaces:
Serial data interfaces: RS-530, V.35, X.21, V.24, V.36/RS-449
Ethernet LAN interface modules with a built-in bridge (IR-ETH, IR-ETH/Q, IR-ETH/QN) or an IP router (IR-IP).
The synchronous data ports can operate in the following clock modes:
DCE: the unit provides both transmit and receive clocks to the user equipment, with optional sampling of incoming data with an inverted clock.
DTE1: the FCD unit provides the transmit clock, the attached user equipment provides the receive clock
DTE2: the attached user equipment provides both transmit and receive clocks.
When equipped with IR-ETH, IR-ETH/Q, or IR-ETH/QN interface modules, FCD-E1L and FCD-T1L transparently connect remote LANs over E1/T1 links. They filter Ethernet frames, forwarding only frames that are destined to the WAN. The IR-ETH/QN port supports autonegotiation and VLAN frames.
When an IR-IP interface module is installed, the units operate as IP gateways to forward IP packets that are destined to the IP
network. This prevents broadcast to the WAN and enables LAN users to register for IP multicast groups.
FCD-E1L and FCD-T1L with the IR-IP interface module also connect local IP networks to public networks at full E1/T1
speed, in contrast with connection over statistical protocols, such as Frame Relay.
The IR-ETH/QN port has a 10/100BaseT interface while other Ethernet ports have 10BaseT (UTP) interfaces.
FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 ) MANAGEMENT AND MAINTENANCE
Status and diagnostic information is defined, configured, and monitored using one of the following methods:
ASCII terminal connected to the async control port
FCD-E1L and FCD-T1L have an internal SNMP agent that is managed by any generic SNMP station or by the RADview SNMP network management application.
The FCD-E1L and FCD-T1L support both dial-in and dial-out modem connections through the serial RS-232 port, by using SLIP or PPP protocol, or a command line interpreter on an ASCII terminal. These out-of-band connections can be used for remote configuration and monitoring, as well as for sending callout alarm messages.
Inband management can be performed either via a dedicated timeslot with the standard Frame Relay (RFC 1490), or by using the spare bits (Sa bits) on Timeslot 0 (FCD-E1L) or FDL bits (FCD-T1L). This allows the user to set up, monitor, and run diagnostics on the remote unit. If spare bits on TS0 or FDL are used for inband access, they must be passed transparently end-to-end.
Maintenance capabilities include user activated local and remote loopbacks on the E1/T1 main link and data ports. Local loopbacks can be activated either from the terminal or via the DIP switch. The user can activate a BER test on the data port. Additionally, the data port responds to an ANSI FT1 RDL (T1E1.2/93-003) inband loop code, generated by the remote FCD-E1L, FCD-T1L, or DXC in a specific bundle of timeslots allocated only to that port.
E1 network statistics are stored in memory, according to RFC 1406. Statistical information can be retrieved locally through the control port.
T1 network statistics are stored in memory, according to ANSI and AT&T standards. The statistical information may be retrieved by the service provider (ANSI only) or locally through the control port.
FCD-E1L ( FCD-E1L/U/AC/V35 ) and FCD-T1L ( FCD-T1L/AC/V35 ) data sheet (pdf 360k)