LA-110 Advanced ATM Integrated Access Device from RAD
LA-110 from RAD is an advanced ATM Integrated Access Device (IAD) that provides voice, data and LAN services over ATM networks for small and medium-sized businesses.
The services supported by RAD LA-110 include:
High-quality leased lines over E1 or serial data links
Voice, such as ISDN BRI, PRI or FXS
E1 (CES, PRI, UNI) High-speed data (transparent and Frame Relay)
Ethernet with MAC bridge and IP router.
LA-110 WAN INTERFACE
LA-110 has one WAN (uplink) port, used to connect to the ATM network.
The WAN port can be ordered with one of the following interfaces:
2-wire or 4-wire SHDSL interface
ADSL interface (Annex A)
The UNI network interface supports the following ATM adaptation layers:
AAL1 for transparent transport of serial data streams, and for circuit emulation services (CES)
AAL2 for providing ATM Forum Loop Emulation Services (LES) that support PSTN and ISDN BRI and PRI access
AAL5 for packet traffic (Frame Relay, Ethernet, IP).
The network port of the RAD LA-110 supports the following classes of service: CBR, VBR, UBR and UBR+.
Per-connection user-configurable traffic shaping and traffic contract enforcing ensure improved QoS and efficient utilization of the ATM uplink bandwidth.
RAD LA-110 LAN INTERFACE
The LAN port has an Ethernet 10/100BaseT interface with autonegotiation support.
The LAN interface can be configured to operate as a MAC bridge or an IP router.
In bridge mode the LA-110 LAN interface operates as a self-learning media access bridge. The MAC bridge is user-configurable to
VLAN-aware and VLAN-unaware modes.
When configured to operate as an IP router, LA-110 supports the following interfaces:
One or two LAN interfaces
116 WAN interfaces, each using its own PVC
An optional host interface for router management.
The router uses static routing entries or RIP I, RIP II for routing decisions. In the IP router mode, LA-110 can use encapsulation per RFC2684, or transfer the traffic using PPPoA (with PAP and CHAP authentication). LA-110 serves as a DNS relay, exchanging DNS requests and replies between its hosts and the DNS server.
A firewall can be set on each one of the router interfaces (WAN, LAN) for filtering inbound or outbound traffic.
LA-110 can be configured as a DHCP server or to DHCP relay mode.
The IP router provides up to 20 NAT/NAPT translations. Each translation can be applied to a WAN or LAN port.
LA-110 DATA INTERFACE
The LA-110 data port is a synchronous serial DCE port, supporting V.35 and X.21 interfaces. The data port operates at the rates of N Χ 64 kbps in the range of 64 to 2048 kbps.
The data payload is processed in accordance with the user-selectable application mode:
AAL1 or Frame Relay.
In AAL1 mode, the data stream is transferred transparently at the CBR service category. The AAL1 stream mode supports any Layer 2 protocol.
When the LA-110 data port operates in Frame Relay mode, the traffic is carried over AAL5, at the user-configurable ATM service
LA-110 supports up to 16 DLCIs.
The Frame Relay interworking mode can be configured to:
Service interworking per FRF.8
Network interworking per FRF.5.
FXS INTERFACE OF LA-110
LA-110 can be ordered with four independent FXS analog voice interfaces, for direct connection to subscriber POTS phone, fax or voiceband modem equipment. Each port provides power feed and ringing to the subscriber equipment.
The input and output audio levels of each channel are user-selectable. The signals are encoded by a PCM codec, using 64 kbps PCM encoding per ITU-T Rec. G.711, enabling transparent transfer of DTMF signaling, Group III fax signals and voiceband modems.
Each channel includes a near-end echo canceller. The echo canceller can be disabled when processing fax or modem signals.
For compatibility with national implementations, the PSTN signaling characteristics are user-selectable.
The transport of analog voice requires LES over AAL2, which allows several voice connections to share the same VC. The ELCP
protocol can also be used.
ISDN INTERFACE OF LA-110
Four independent ISDN BRI S0 interfaces comply with ETSI 300012 and ITU-T Rec. I.430. The interface characteristics are
compatible with many types of ISDN switches, including NTT, 5ESS, DMS-100 and NI1. The ISDN interface operates in NT
(Network Termination) mode, enabling direct connection of ISDN terminal equipment to S ports.
The ISDN ports require use of LES over AAL2, allowing several connections to share the same VC. The ELCP protocol can also be used. The signaling information carried by the multiplexed 64-kbps D channel is transported transparently to the voice gateway.
LA-110 can be ordered with one user E1 port with balanced or unbalanced (via an adapter cable) interfaces.
The E1 interface supports the following framing modes:
ISDN PRI (AAL2 only)
E1 ATM UNI.
In AAL1 mode LA-110 uses the following transmission methods:
Structured CES, transmitting each E1 bundle over separate PVC
Dynamic bandwidth allocation (DB-CES) for detecting voice channel activity and allocating uplink bandwidth accordingly.
In AAL2 mode, LES is used for voice support, with or without ELCP. Application identifiers determine the signaling methods:
DSS1 for ISDN BRI and PRI
ISDN PRI remote access with
LA-110 transparently transfers the ATM-based E1 UNI services at the rate of 1984 kbps.
LA-110 TIMING MODES
LA-110 supports flexible timing modes to enable hierarchical timing distribution in the network.
The LA-110 system timing can be locked to the following sources:
NTR LA-110 locks its timing reference to the DSLAM clock
Received LA-110 receives the clock from the E1 equipment
Adaptive the LA-110 clock is locked to an average arrival rate of the ATM cells carrying voice channels
Internal LA-110 uses the clock generated by its internal oscillator.
MANAGEMENT CAPABILITIES OF THE RAD LA-110
The unit can be managed using different ports and applications:
Local out-of-band management via an ASCII terminal connected to the RS-232 port
Remote out-of-band management via the LAN port
Remote inband management via the ATM uplink. Remote management is performed using Telnet, Web browser or RADview-EMS, RADs SNMP-based element management system.
Different stations can manage LA-110 simultaneously, enabling monitoring the network status from different locations.
PLUG & PLAY
LA-110 supports automatic configuration from a remote location. Once the unit is installed it needs only to be powered up. It then automatically receives its management IP address, and all the configuration procedures can be performed from the remote location.
LA-110 collects performance monitoring statistics at the physical and ATM layers for the network and user interfaces. It also provides statistics for individual connections (AAL1, AAL5).
Comprehensive diagnostic capabilities include:
Physical loopbacks on the network and user interfaces
OAM loopback on a VCC
Ping for IP connectivity checks.
LA-110 stores alarms detected during its operation in a buffer holding up to 200 alarms.
RAD LA-110 data sheet (pdf 544k)