@startuml
skinparam monochrome true
skinparam defaultFontName Arial
skinparam classFontSize 10
skinparam sequenceBoxBorderColor #black
participant "**Host A**\nTCP Control Service Gate" as hosta_tcp_ctr
participant "**Host A**\nAdministration Gate" as hosta_adm
participant "**Host B**\nAdministration Gate" as hostb_adm
participant "**Host B**\nTCP Control Application Gate" as hostb_tcp_ctr
participant "**Host A**\nTCP Data Service Gate" as hosta_tcp_data
participant "**Host B**\nTCP Data Application Gate" as hostb_tcp_data
autonumber
...**Notation:** Gate Identifier : Pipe Session Open on [PIN,POUT]...
hostb_adm->hosta_adm:EVT_ADM_BIND [**TCP_CTR,P20**]
hosta_adm->hostb_adm:EVT_ADM_BIND [**TCP_CTR,P10**]
note right : Pipe Session Open on [P20,P10]
note left : Pipe Session Open on [P10,P20]
...
hostb_tcp_ctr->hosta_tcp_ctr: TCP-REQUEST-CONNECTION-Service-Command [Parameters...] on P10
activate hosta_tcp_ctr
activate hostb_tcp_ctr
hosta_tcp_ctr-->hostb_tcp_ctr: eTCP-OK [CTX_ID0001] on P20
deactivate hostb_tcp_ctr
deactivate hosta_tcp_ctr
...
hosta_tcp_ctr->hostb_tcp_ctr: EVT-TCP-ERROR-Application-Event[CTX_ID0001, eUNREACHABLE] on P10
@enduml