Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 43
3.1.3.6 Multilink Bundles
A multilink bundle is a collection of channels on channelized ports that physically
reside on the same adapter card. Multilink bundles are used by providers who offer
either bandwidth-on-demand services or fractional bandwidth (DS3) services.
Multilink bundles are supported over PPP channels (MLPPP). All member links of an
MLPPP group must be of the same type (either E1 or DS1).
The following cards, modules, and platforms support multilink bundles:
• T1/E1 ports on the 7705 SAR-A (variants with T1/E1 ports)
• T1/E1 ports on the 7705 SAR-M (variants with T1/E1 ports)
• T1/E1 ports on the 7705 SAR-X
The following must have all member links of an MLPPP bundle configured on
the same card or module:
− 16-port T1/E1 ASAP Adapter card
− 32-port T1/E1 ASAP Adapter card
− T1/E1 ports on the 4-port T1/E1 and RS-232 Combination module (on
7705 SAR-H)
The following must have all member links of an MLPPP bundle configured on
the same card or module, and on the same port:
− 2-port OC3/STM1 Channelized Adapter card
− 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card
3.1.3.7 IMA
The 16-port T1/E1 ASAP Adapter card, 32-port T1/E1 ASAP Adapter card, and the
2-port OC3/STM1 Channelized Adapter card support Inverse Multiplexing over ATM
(IMA). IMA is a standard developed to address the increasing need for bandwidth
greater than the DS1 or E1 link speeds (1.544 or 2.048 Mb/s, respectively) but less
than higher link speeds such as DS3 (44.736 Mb/s). IMA combines the transport
bandwidth of multiple DS1 or E1 channels in a logical link (called an IMA group) to
provide scalable bandwidth.
3.1.3.8 SONET/SDH
The 4-port OC3/STM1 Clear Channel Adapter card has four hot-pluggable,
SFP-based ports that can be independently configured to be SONET (OC3) or SDH
(STM1).
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