【正文】 dure on the D Channel) No No Not used between routers. Used on D channel from router to ISDN switch for signaling. 各種點(diǎn)到點(diǎn)通信協(xié)議的不同 Protocol Error Correction Architected Type Field Other Attributes HDLC (HighLevel Data Link Control) No No Cisco’s default on serial links. Cisco uses a proprietary type field to support mulitprotocol traffic. PPP (PointtoPoint Protocol) Allows user to choose whether error correction is performed。 ? 使用 B信道進(jìn)行數(shù)據(jù)傳輸。 T/1 允許 。這就意味著兩端都要同意使用某種速度，但是如果要讓所有的設(shè)備都真正的按同樣速度操作，代價(jià)是相當(dāng)昂貴的，所以一般讓設(shè)備和某個(gè)時(shí)鐘源的速率同步。 廣域網(wǎng)術(shù)語 項(xiàng)目 定義 同步（ synchronous) 字節(jié)流受時(shí)序的影響。 (.) T/1 mux 將一條 T/1電路復(fù)用成 24條不同的 64kbps電路。 ISDN接口類型 Function Group Acronym Stands for.. Description TE1 Terminal Equipment 1 ISDN capable. 4 wire cable. Understands signaling, 2B+D. Uses S reference point. TE2 Terminal Equipment 1 Does not understand ISDN protocols and specifications. Uses R reference point, typically an RS232 or cable, to connect to a TA. TA Terminal Adpater Uses R reference point and S ref