S p e c i f i c a t i o n s 235ADSL (2004/2004s and 2008/2008s)Voice FeaturesAnalog VoiceVoice Ports: 4 or 8 POTS ports (RJ11)Failover: Analog input fail over to Line 1 (RJ11)Signaling: Loop start, ground startDialing: DTMF (tone), PulseRing Source: InternalImpedance: 600 or 900 Ω or complex impedanceREN: 5 REN per port, 16 REN totalLoop Current: 20, 24 mA typical (country-specific)Idle State Voltage: −48 V typicalRing Voltage: Balanced 65 V rms ± 5% at 5 REN loadRing Frequency: 20, 25, 50 Hz (country-specific)Gain/System Loss: Programmable, +3 to −9 dBDigital VoiceCompression for non “s” Units: G.711 (64 kbps PCM), G.726 (32 kbpsADPCM)Compression for “s” Units (VoIP): G.711 (64 kbps PCM), G.726 (32 kbpsADPCM), G.729a (8 kbps CS-ACELP)Encoding: A-law, μ-lawEcho Cancellation: G.168 compliant (single reflector)Protocol Support: CopperCom, ELCP (af-vmoa=0145),Jetstream, LES (af-vmoa-0145), MGCPand SIP (s-version only)DID/DOD SupportFax Support: V.17, V.29 supportModem Support: V.34, V.90 supportCalling Features: Caller ID, flash hook, distinctive ring,stutter dial tone, call forwarding, callwaitingCell Delay Variation Buffer: Configurable 0−30 msData FeaturesLAN Interface: 10/100Base-T (RJ45)Bridging: IEEE 802.1d including spanning treeRouting: Default, Static, RIP1 (RFC 1058), RIP2(RFC 2453), ICMP for IP PacketProcessing
