7705 SAR Interfaces
7705 SAR OS Interface Configuration Guide Page 31
For PPP/MLPPP channel groups, the encapsulation type must be ipcp. For TDM VLLs, the
encapsulation type must be cem. For ATM VLLs, the encapsulation type must be atm.
In access mode, PPP channels on the T1/E1 ASAP Adapter card can be associated with
n × DS0 channel groups. Although multiple PPP channel groups are supported per T1/E1
port, all the channel groups must be the same encapsulation type. For example, if one
channel group on a given port is set for ipcp encapsulation, another channel group on the
same port cannot be set to cem.
If MLPPP channels are used, an MLPPP channel group fills up an entire DS1 or E1 link.
SONET/SDH ports in access mode on a 4-port OC3/STM1 Clear Channel Adapter card can
be configured for ATM (such as for 3G UMTS Node Bs). The encapsulation type is atm.
Network Ports
For network uplinks on the T1/E1 ASAP card, standalone PPP ports can be used or MLPPP
can be configured on a number of T1/E1 ports. For MLPPP groups, all member links of an
MLPPP group must reside on the same card and be of the same type (either E1 or DS1). The
encapsulation type for MLPPP must be ppp-auto.
Ethernet uplinks can also be used as a cost-effective alternative to T1/E1 links.
The 7705 SAR supports both copper and fiber uplinks on the Ethernet Adapter card.
Rate Limiting on Network Ethernet Ports
The 7705 SAR supports egress rate limiting on uplink Ethernet ports. Rate limiting sets a
hard limit on the amount of traffic that can leave the Ethernet port, which is useful when a
mobile operator has leased a fixed amount of bandwidth.
Note: For information on VLLs, refer to the 7705 SAR OS Services Guide.
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