FCD-2L E1 or Fractional E1 Access Unit
FCD-2L from RAD is a single-port access unit for E1 or Fractional E1 services. Data port rates are selectable for any multiple of 64 or 56 kbps, up to 1984 kbps. User data is placed into an E1 frame using only the required number of timeslots. FCD-2L is available with or without an LTU (Line Termination Unit). This allows connection directly to the service providerís line or, alternatively, via an integral LTU ensuring a range of up to 2 km (1.2 mi). The E1 interface of FCD-2L is compatible with virtually all carrier-provided E1 services and meets the requirements of ITU recommendations G.703, G.704, G.706, and G.732. It supports either 2 or 16 frames per multiframe, with or without CRC-4, as well as unframed data streams. Line coding is HDB3. FCD-2L can also be used as a rate and interface converter between the user data port interface and E1 (G.703, G.704) lines. FCD-2L has a single user port, which can be a synchronous data port with V.35, RS-530, V.36/RS-449 or X.21 interface, or a single LAN port with built-in bridge.
FCD-2L synchronous data ports can operate in the following clock modes:
DCE: FCD-2L provides both transmit and receive clocks to the connected user equipment, with optional sampling of the incoming data with an inverted clock
DTE1: FCD-2L provides the transmit clock; connected user equipment provides the receive clock
DTE2: connected user equipment provides both transmit and receive clocks to FCD-2L.
When equipped with optional IR-ETH or IR-ETH/Q bridge, RAD FCD-2L can transparently connect remote LANs over unframed E1 links, utilizing the full E1 bandwidth. It filters Ethernet frames, forwarding only the frames destined to the WAN. The IR-ETH/Q Ethernet port also supports VLANs. The LAN ports are available with a 10BaseT (UTP) Ethernet interface. The ports operate in full duplex mode. Timeslot assignment is according to the data port speed and is consecutive, starting from any timeslot.
The E1 link timing may be taken from the recovered receive clock (LBT) or from an internal oscillator.
FCD-2L is set up and controlled by internal jumpers. Front-panel switches control all diagnostic options.
Diagnostic capabilities include user-activated local loopbacks on the E1 link and on the digital data port. The data port can respond to an inband ANSI FT1 loop code that can be generated from the remote FCD-2L data port. A pseudo-random data pattern (BERT) can be activated and detected on the data channel.
The FCD-2L front panel can display Major and Minor alarms. FCD-2L also has a high Bit Error Rate (BER) indicator, which lights when the BER on the E1 line is higher than 1 x 10-3.
FCD-2L is available as a standalone unit or as a card for the 19-inch rack mount enclosure, ASM-MN-214. A rack-mount adaptor kit (RM-9) enables installation of one or two standalone units in a 19-inch rack.
FCD-2L product data sheet (pdf)