Telco Services - 3Com SuperStack II User Manual

Telco Services

Table 2 Dial-Up and Leased Line Services
Telco Line
Dial-Up Lines:
Plain Old Telephone
Service (POTS)
ISDN BRI
Switched 56
Leased Lines:
E1
T1
Fractional T1
Digital Data Service (DDS) PPP
* Some ISDN lines support up to 56 Kbps per B channel. For more information, contact your ISDN service provider.
Table 3 Packet-Switched Services
Packet-Switched
Services/Protocol
X.25
Frame Relay
SMDS
To create a WAN, you must buy lines and services from a
telecommunications company (Telco). Services include dial-up lines,
leased lines, and packet-switched services.
Dial-up lines, like ISDN, allow you to dial your destination only when you
need to and hang up when your call is complete. A leased line is always
available between two locations.
Packet-switched services, like Frame Relay, use a combination of leased or
dial-up lines with Telco-owned switching between two sites. These
services free you from the cost of owning the line the entire length.
Table 2 describes dial-up and leased line services available for the WAN
and serial ports. Table 3 describes packet-switched services.
Protocol
PPP
PPP/Multilink PPP TA
PPP
PPP
PPP
PPP
Telco Line
POTS
Leased line
Leased line
Serial Device
(Required on Serial Ports) Data Transfer Rate
Modem
CSU/DSU
CSU/DSU
CSU/DSU
CSU/DSU
CSU/DSU
Serial Device Required on
Serial Ports
Modem
CSU/DSU
CSU/DSU
Telco Services
Up to 56 Kbps
2 channels up to 64 kbps each
56 Kbps
2.048 Mbps
1.544 Mbps
Up to 24 channels (DS0s) at 64
Kbps each
Up to 64 Kbps
Data Transfer Rate
Up to 56 Kbps
Up to 2.048 Mbps
Up to 2.048 Mbps
15
*