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18 CHAPTER 1: INTRODUCING THE ROUTER 3000 FAMILY
Operating mode Channelized T1
Fractional T1
ISDN PRI
E1
Channelized E1
Fractional E1
ISDN PRI
Services Backup
Terminal access
ISDN
Protocols PPP
MP
HDLC
LAPB
X.25 (ITU-T X series Recommendations)
Frame Relay
Q.921
Q.931
Q.SIG
Table 21 Attributes of the CT1/PRI Port (continued)
Attribute CT1/PRI Description E1/CE1/PRI Description