Black Box IDSL 12-PORT ACCESS MUX Guia De Inicio Rapido página 8

Overview
The IDSL 12-Port Access Mux Module (LRA1205C) is a 12-port IDSL (ISDN
Digital Subscriber Line) access multiplexor module for the 2 x 12 slot or 1 x 4 slot
DSLAM Chassis. The module attaches to each Uplink Interface Module via a
10/100-Mbps Ethernet connection on the backplane. Each IDSL port translates
the incoming Ethernet frame to IDSL via media conversion. This is a Layer 1
conversion, where the native frames are then passed across the IDSL link, over a
copper pair to an LRA1200A-I. Received WAN frames are converted back to
Ethernet and forwarded to the appropriate backplane port. No routing or
translational bridging is done internally.
The connection across the IDSL line may be 128 kbps or 144 kbps bandwidth.
Speed is hardware- or software-selectable per port (software overrides hardware
settings) and is determined by the IDSL 12-Port Access Mux Module. The remote
subscriber unit will determine its line speed through communication with the
Module. IDSL technology is intended for use from the telephone company central
office across the local loop to the home or business. It may also be used in MDU
(Multiple Dwelling Unit) environments to provide high-speed, long-reach data
service over phone-grade copper cable to 18,000 feet (5486.4 m). The typical
application for IDSL technology is high-speed Internet access or remote LAN
access.
Bandwidth Selection
The Module provides two bandwidth options for the IDSL link, as mentioned
above. Two switch banks (located on the circuit board) are used to select the
default bandwidth. The switches affect the operation of the IDSL connection only.
These switches are paired in groups of two, with each group affecting a single IDSL
port. See Table 1-1.
Table 1-1. Upper and Lower Switch Bank Switches
1-2
3-4
5-6
7-8
9-10
11-12
Upper
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
IDSL 12-PORT ACCESS MUX MODULE
Lower
1-2
3-4
5-6
7-8
9-10
11-12
Port 7
Port 8
Port 9
Port 10
Port 11
Port 12
5