Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 153
DSL bonding allows multiple physical DSL links to be combined in one logical link to
increase bit rate capacity to the subscriber and/or extend the reach of existing
services. DSL bonding is activated by the handshake messages between the Central
Office and CPE as defined in ITU-T G.994.1. Once the port is configured for bonded
mode, any pairs not included in the bonded groups cannot be used to carry traffic.
The 6-port DSL Combination module supports up to two bonding groups, one for
SHDSL and one for xDSL. The 8-port xDSL module and the RJ-45 xDSL port on the
7705 SAR-Wx support only one bonding group. The DSLAM handshake determines
the number of DSL pairs used in each bonding group as shown in Table 20.
Bonding functions are driven entirely by the Central Office with the exception of the
ATM VPI/VCI when ATM bonding is used on an xDSL interface.
The 7705 SAR-M supports both ATM and PTM bonding. The 7705 SAR-Wx
supports PTM bonding.
3.2.18.2 ATM Bonding
ATM bonding is specified by ITU-T G.998.1 and is used for ATM-based transmission
links for all types of ADSL. ATM bonding adds sequence information to ATM cells,
allowing resequencing by adding delay variation to account for speed differences
across multiple physical links in one bonding group. ATM bonding is sometimes
referred to as multi-ADSL bonding because multiple ADSL lines typically use
ATM-based transmission links.
Table 20 DSL Pairs by Bonding Group
Bonding Group 6-port DSL
Combination Module
DSL Pairs
8-port xDSL
Module
DSL Pairs
7705 SAR-Wx
RJ-45 xDSL Port
DSL Pairs
xDSL PTM 1 to 2 1 to 8 1 to 4
SHDSL 2 to 4 — —
ADSL2/ADSL2+ ATM 1 to 2 1 to 2 —
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