Rainbow Electronics DS3184 - Manual (Page 11)

Maxim/Dallas Semiconductor Confidential Product Preview: DS3181,2,3,4
Rev 1.5 11 of 13 022304
3.23 Subrate Features
• Independent per port built-in support for subrate DS3 or E3
• Independent subrate operation for both Rx and Tx data paths
• Subrate operation for each channel is totally independent from the other channels’ operation, i.e. all
subrate functions within the device are mutually exclusive
• Three distinct subrate algorithms:
• (FFRAC) Externally controlled with DS3 or E3 payload manipulating capability
• (XFRAC) Externally controlled with simple DS3 or E3 data rate reduction capability
• (IFRAC) Internally controlled with flexible DS3 or E3 data rate reduction capability
• Subrate algorithm selection is on per port basis
• Internal subrate mechanism allows down to bit-level granularity of the DS3 or E3 payload
4 STANDARDS COMPLIANCE
Specification
Specification Title
ANSI
T1.102-1993 Digital Hierarchy – Electrical Interfaces
T1.107-1995 Digital Hierarchy – Formats Specification
T1.231-1997 Digital Hierarchy – Layer 1 In-Service Digital Transmission Performance
Monitoring
T1.404-1994 Network-to-Customer Installation – DS3 Metallic Interface Specification
T1.646-1995 Broadband ISDN – Physical Layer Specification for User-Network Interfaces
Including DS1/ATM
ATM Forum
af-phy-0034.000 E3 Public UNI, August, 1995
af-phy-0039.000 UTOPIA Level 2, Version 1.0, June, 1995
af-phy-0043.000 A Cell-Based Transmission Convergence Sublayer for Clear Channel Interfaces,
November, 1995
af-phy-0054.000 DS3 Physical Layer Interface Specification, January, 1996
af-phy-0136.000 UTOPIA 3 Physical Layer Interface, November, 1999
af-phy-0143.000 Frame-based ATM Interface (Level 3), March, 2000
af-bici-0013.003 BISDN Inter Carrier Interface (B-ICI) Specification Version 2.0 (Integrated),
December, 1995
ETSI
ETS 300 686 Business TeleCommunications; 34Mbps and 140Mbits/s digital leased lines (D34U,
D34S, D140U and D140S); Network interface presentation, 1996
ETS 300 687 Business TeleCommunications; 34Mbps digital leased lines (D34U and D34S);
Connection characteristics, 1996
TBR 24 Business TeleCommunications; 34Mbps digital unstructured and structured lease
lines; attachment requirements for terminal equipment interface, 1997
ETS 300 337 Transmission and Multiplexing (TM); Generic frame structures for the transport of
various signals (including Asynchronous Transfer Mode (ATM) cells and
Synchronous Digital Hierarchy (SDH) elements) at the ITU-T Recommendation
G.702 hierarchical rates of 2 048 kbit/s, 34 368 kbit/s and 139 264 kbit/s, Second
Edition, June, 1997
ETS 300 689 Business TeleCommunications (BTC); 34 Mbps digital leased lines (D34U and