Information Technology Reference
In-Depth Information
ISDN Reference Points
•
U
—Between NT1 and LE, 2-wire
•
T
—Between NT2 and NT1, 2-wire
•
S
—Between TE1 or TA and NT2
•
R
—Between TE1 and TA, usually an EIA/TIA-232
•
S/T
—Between TE1 and NT12 (S and T combined)
SONET Interface Speeds
•
OC-1 = 51.85 Mbps
•
OC-3 = 155.52 Mbps
•
OC-12 = 622.08 Mbps
•
OC-24 = 1.244 Gbps
•
OC-48 = 2.488 Gbps
•
OC-192 = 9.952 Gbps
Framing Standards
Table 5-10
Protocol
Frame Type
ISDN D Channel
LAPD
Frame Relay
LAPF
X.25
LAPB
Cisco's HDLC
Proprietary LAP
PPP Authentication
Table 5-11
Authentication Protocol
Description
Password Authentication Protocol (PAP)
Uses cleartext passwords
Challenge Authentication protocol (CHAP)
Encrypts passwords and uses three-way handshake
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