7705 SAR Interfaces
188
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
• 16-port T1/E1 ASAP Adapter card
• 32-port T1/E1 ASAP Adapter card
• T1/E1 ports on the 7705 SAR-M (variants with T1/E1 ports)
All physical links or channels in a bundle or group combine to form one logical
connection. A bundle or group also provides redundancy in case one or more links
that participate in the bundle fail. For command syntax, see Configuring Multilink
PPP Bundles. To configure channelized ports for TDM, see Configuring Channelized
Ports.
For 12-port Serial Data Interface cards and the RS-232 ports on the 4-port T1/E1 and
RS-232 Combination module, some or all of a port bandwidth can be dedicated to a
channel by aggregating a number of DS0s into a single bundle. Serial data
transmission rates below the rate of a single DS0, that is, less than 64 kb/s, are
achieved using the High Capacity Multiplexing (HCM) proprietary protocol. These
rates are known as subrates, and are supported only when operating in RS-232
mode or X.21 mode.
3.9.4 Using Partial Bandwidth
Fractional T1/E1 allows one or more DS0 channels to be bundled together (up to the
maximum bandwidth of the network link), allowing the customer to use only that
portion of the link that is needed. This means that the PPP service can use a selected
number of timeslots (octets) in the network T1 or E1 link, thus reducing the amount
of T1 or E1 bandwidth that must be leased or purchased from the attached carrier.
This leads to multiplexing efficiencies in the transport network.
The following cards and platforms support fractional T1/E1 on a PPP channel group
(encapsulation type ppp-auto), or all timeslots on T1/E1 ports, in network mode:
• 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)
• 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
Note: A DS0 channel operating at a rate less than 64 kb/s still uses a full 64 kb/s timeslot.
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