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Home Interfaces S5 S6a Gx S8 S9-S13 Sgi Rx SBC LTE X2 X2AP Reference
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What does LTE X2 connectivity mean?
Keywords
LTE X2 connection, X2AP, X2U, eNB.

LTE X2 connections : This defines interface between two E-UTRAN NodeB’s (eNB’s). This interface can support both data X2U and control X2AP. In some scenarios only X2AP interface is implemented and others only X2U interface.
UMTS LTE X2 Interfaces
LTE X2 interface Functionality :
(1)  Mobility Management.
(2)  Enable Inter-Cell interference and Load Management .
(3)  SON (discussed below) and automatic neighbor relations management
(4)  Set/Reset X2 interface.
(5)  Error Handling for specific or general cases.
An important technical detail to understand for X2 connection is the logical nature of the interface.
Evolved Packet Core (EPC) system architecture for all IP.Mobility Management Entity (MME),
Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW.
Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG)
Multiple antenna techniques - MIMO, Adaptive antenna systems - AAS and Antenna diversity - AD
UMTS LTE X2 and S1 interface, Diagram above to discuss S1 and X2 interfaces
S9-S13 Sgi Rx SBC.
X2AP.
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Serving 
Gate Way
MME
Serving 
Gate Way
MME
eNB
eNB
eNB
S1
S1
S1
SAE Gateway
SAE Gateway
X2
X2
X2
References Page.
LTE - Long Term Evolution topics from here
In most architecture’s its shown as a direct connection between eNodeB’s. For implementations, its physically routed through transport connections similar to S1 interface connections.  The LTE connection’s between eNB’s S1 and X2 are shown in diagram below.