Alcatel Carrier Internetworking Solutions Switch/Router 用户手册

Page 3-36

The 

ISDN Basic Rate Interface WAN

 Switching Module (

WSX-BRI-SC

) supports either one (1) 

serial port and one (1) 

BRI

 port or two (2) serial ports and two (2) 

BRI

 ports. The version with 

1 serial port and 1 

BRI

 port is referred to as the 

WSX-BRI-SC-1W

; the version with 2 serial ports 

and 2 

BRI

 ports is referred to as the 

WSX-BRI-SC-2W. See 

 for more information.

The serial port on a 

WSX-BRI-SC

 module is essentially the same as the serial ports found on 

the 

WSX-SC

 module. A 

WSX-BRI-SC

 serial port can detect, and configure itself, for any of five 

serial cable types (

RS-232

, 

V.35

, 

X.21

, 

RS-530

, and 

RS-449

). A 

WSX-BRI-SC

 serial port is normally 

considered a physical 

DTE

 device, but it can be turned into a physical 

DCE

 device—for speed 

or clocking purposes—by simply plugging in a 

DCE

 cable. The 

WSX-BRI-SC

 internally senses 

whether a 

DCE

 or 

DTE

 cable is connected and configures itself appropriately.

The 

BRI

 port on the 

WSX-BRI-SC

 board can be configured as either a “U” or an “S/T” type of 

interface (the board is shipped set to “U”). Either type of interface supports two “B” channels 
operating at 56/64 Kbps and one “D” channel operating at 16 Kbps.

Software running in the switch allows you to configure the operation of the Point-to-Point 
Protocol (

PPP

) over the serial port or the BRI port. The serial port can also support the Frame 

Relay protocol. The software commands used to configure 

PPP

 are described in Chapter 30, 

“Point-to-Point Protocol.” The software commands used to configure Frame Relay are 
described in Chapter 29, “Managing Frame Relay.” The software commands used to configure 
the WAN “links” that support 

PPP

 connections are described in Chapter 31, “WAN Links.” 

Finally, the software commands used to manage the ISDN ports are described in Chapter 32, 
“Managing ISDN Ports.”

With the optional 

HRE-X

 you can increase routing performance to 1.5 million packets per 

second per module and up to 12 Mpps in a fully-loaded 9-slot chassis.