HCD-E1

HDSL E1 Access Unit

• Two digital ports and a sub-E1 drop-and-insert port
• Extended range up to 4.8 km (3 miles) over 4-wire, and up to 2.5 km (1.6 miles) over 2-wire lines (24 AWG)
• Supports 2-wire or 4-wire connections
• Works opposite HTU-E1 and HTU-2
• Digital interfaces available: V.35, X.21, RS-530, V.36/RS-449 and Ethernet (bridge), IP (router)
• In-band dedicated timeslot for remote management

The HCD-E1 is an access unit with an HDSL link for E1 rates. It includes two digital ports and an optional sub-E1 drop-and-insert port. The digital ports have user-selectable data rates: n x 56/64 kbps, up to 2.048 Mbps. One of the data ports can be an Ethernet bridge, providing 10BaseT LAN connectivity.The HCD-E1 supports 2-wire or 4-wire connections.Timeslot assignment is programmable, so that data from each data port and from the sub-E1 port can be integrated into a single E1 frame and translated into the HDSL frame.The HDSL link interface complies with the ETSI HDSL standard. The sub-E1 port complies with ITU G.703, G.704, G.706, G.732 and G.823.The HCD-E1 includes an SNMP agent, which enables complete network control and monitoring from a central SNMP station.The product includes an in-band management channel so that the remote unit can be controlled and monitored from a central site. The HCD-E1 can also be managed using a dedicated timeslot or reserved bits in timeslot 0 of the E1 frame. This option enables management of the unit from anywhere in a fractional E1 network. The product can also be managed from the front panel LCD and switches, or from an ASCII terminal attached to the management port.The HCD-E1 supports priority bumping. This enables the user to choose which timeslots will remain active in case transmission is lost over one of the two pairs.Local and remote loopbacks provide diagnostics and a built-in bit error rate (BER) tester checks the link integrity. A built-in alarm buffer enables 24-hour performance monitoring storage.The digital interfaces supported are V.35, X.21, RS-530, V.36/RS-449 and a built-in Ethernet bridge (with RJ-45 or BNC connectors) or router. The HCD-E1 can work opposite HDSL cards of the DXC and the Megaplex over 2-wire or 4-wire connections.