If you are making use of half-height SPAs, you can use upto 4 half height SPA's in a SIP-10 module. But in case you want to make use of full height SPAs, you should use upto 2 full height SPAs.
Cisco ASR 1000-SIP10-Supports:
- 4 half height (Rate or full rate or combination) SPAs with up to 16 ports per SPA
-2 full height (Rate or full rate or combination) SPAs with up to 32 ports per SPA
-2 half height and 1 full height comb in at on that does not exceed 64 ports
-Up to 10 Gbps of oversubscription
The SIP40 allows up to 40 Gbps of bandwidth capacity between the SIP carrier card and the ESP forwarding engine, as opposed to 10 Gbps for the SIP10.
Max ESP throughput that you could get on ASR1004 chassis is 40 Gbps (20Gbps in and 20Gbps out---> 20G unidirectional & 40 G bidirectional) which requires ESP40G forwarding plane and SIP40 carrier card.
You can refer to this document to understand this better:
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