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H18EDD-0204P-8E1 Ethernet Demarcation Device


H18EDD-0204P-8E1 Ethernet demarcation device,on the basis of high-performance L2 switch service, provides convenience of maintenance and deployment, multi-service support, carrier-class OAM management,reliable protection mechanism, QoS policy, security mechanism, and other service optimization measures. Meanwhile, it features excellent extensibility and reliability.

This type of device provides four GE optical ports as NNIs, two GE electrical ports as UNI ports, eight E1 service interfaces and one FE electrical port as management ports, and its CONSOLE portis RS232. H18EDD-0204P-8E1 supports the latest carrier Ethernet attributes andis compatible with IEEE, ITU, and MEF standards. The carrier-class OAM has enhanced network management capacity and meet the operator’s requirements for comprehensive and powerful capacity of monitoring and management. QoS function has extended the scope of carrier Ethernet, applying it to real-time service,i.e. voice and video. S-VLAN ID is used to implement VLAN extensibility and provide service for hundreds of enterprise users and hundreds of thousands of individual users.


² UNI supports 10/100M/1000M auto-negotiation and 10/100M/1000M full-duplex/half-duplex manual modes, AUTO-MDIX (Media Dependent InterfaceCrossover). NNI supports auto-negotiation mode and 1000M full-duplex mode.

² Circuit emulation of E1 and V.35 services on Ethernet link; SAToP protocol; MPLS,IP/UDP, and MEF encapsulation.

² E1 and V.35 interface clock modes support local oscillator clock, adaptive clocking,and port loopback clock.

² IEEE802.1QVLAN, IEEE802.1ad VLAN (at most 4094 VLAN entries).

² E1 interface complies with ITU-T G.703 recommendation. It has  built-in BER tester and loopback test functions.

² V.35 interface complies with ITU-T V.35/V.36 recommendation, supports framed and unframed modes, and provides various interface rates (N×64K, 1≤N≤31), interface modes (DTE and DCE), and clock selections (DCE internal oscillator clock,DCE line clock and DTE V.35 interface clock).

² 120Ω_E1 interface in RJ-48C. It can be converted to 75Ω unbalanced interface through DIP switch on the bottom plate and proprietary cables, to implement impedance matching.

² Cache absorption function (resisting packet delay variation).

² EFM (Ethernetin the First Mile), CFM (Connectivity Fault Management), SLA (Service   Level Agreement), and other carrier-class OAM management.

² STP/RSTP/MSTP(Spanning Tree Protocol/ Rapid Spanning Tree Protocol/ Multiple Spanning Tree Protocol).

² Link aggregation (manual LAG and static LACP).

² ELPS (Ethernet Linear Protection Switching).

² ERPS (Ethernet Ring Protection Switching).

² QoS function based on port speed limit, port mirror, priority trust, flow classification, flow policy, priority mapping, and queue scheduling.

² Interface Protection.

² Jumbo frame setting (maximum 9720 bytes).

² Flow control.

² DDM (Digital Diagnosis Monitoring).

² MAC address forwarding control.

² IEEE802.1X authentication.

² ACL (Access Control List).

² Broadcast storm repression.

² Remotein-band monitoring management.

² Power failure alarm.

² EzView network management, SNMP (Simple Network Management Protocol), and CLI.

² NTP(Normal Temperature and Pressure) and RMON (Remote Network Monitoring).

² Upgrade of software through TFTP (Trivial File Transfer Protocol).


10/100/1000Base-Tx  interface

Interface specifications

complying with IEEE 802.1, IEEE-802.1u,  IEEE 802.1Q,  and IEEE 802.1p

Interface rate


Operation mode

auto-negotiation, 1000M full-duplex, 1000M half-duplex, 100M  full-duplex, 100M half-duplex, 10M full-duplex, 10M half-duplex

Interface connector

RJ-45 socket

Interface number

3: 2 UNIs and 1 SNMP management port

1000Base-Fx  interface

Interface specifications

complying with IEEE 802.3, IEEE-802.3z, IEEE 802.1Q, IEEE 802.1p, IEEE802.1ad, IEEE802.1d, IEEE802.1w, IEEE802.3ad, IEEE802.3ah, IEEE802.1ag, Y1731

Interface rate


Operation mode

auto-negotiation and 1000M full-duplex

Interface connector

SFP socket

Interface number


Transmission wavelength and distance

Determined by optical  module

E1 interface

Bit rate

2.048 Mbps ± 50ppm

Line code


Point –to-point single  added process delay( when set to minimum delay)

≤ 10ms

Output frequency  stability (adaptive timing, stable)


Output jitter (adaptive  timing)





by default: 120Ω,  75Ω conversion can be achieved

Interface number

0, 4, 8

Power voltage


DC -48V(-36V~-72V)

AC ~220V(AC100V~240V)

Power  consumption

Power consumption

≤ 65W

Operation  environment

Operation temperature

-5°C ~55°C

Storage temperature

-40°C ~70°C

Relative humidity

5%~85%RH (non-condensing)

Chassis size


W×D×H (mm): 440×285×44

Device weight



Typical Application

Standard Compliance


Standards and Protocols


IEEE 802.1Q ,IEEE802.1ad

Link aggregation

S-MAC,D-MAC,S-MAC and D-MAC,manual LAG and static LCAP  modes.


Single  ring, intersecting rings and tangent ring


1:1  bidirectional switching, retentive and non-retentive modes


Port speed limit,port mirroring,priority trust,flow  classification,flow policy,priority mapping,queue scheduling

Flow control

Half-duplex/full-duplex, back pressure and IEEE802.1x


Analyzing monitoring data of optical module


IEEE 802.3ah


Continuity check function,LB,LT


IEEE 802.1ab


Based on port, IP ACL and MAC ACL

Storm suppression

Unkown unicast flow, unkown multicast flow and broadcast  flow


Established by IETF(internet engineering task force)


Client/server model


Support NTP client mode,can synchronize time with NTP  server.