For diagnosing problems, HSSI offe four loopback tests.
诊断问题，HSSI进攻四回路测试。
Like ISDN and DSL, HSSI operates at the physical layer of a network, using the standard Open Systems Interconnection (OSI) model.
像ISDN和dsl,HSSI运营网络的物理层，使用标准的开放系统互连(osi)模型。
Like ISDN and DSL, HSSI operates at the physical layer of a network, using the standard Open Systems Interconnection (OSI) model.
像ISDN和dsl,HSSI运营网络的物理层，使用标准的开放系统互连(osi)模型。
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