User manual

Introduction
Features, Functions, and Options
1-4 July 2004 Wide Bank 28 DS3 - Release 2.4
DS3 Ports
There are four DS3 connections, two transmit and two receive (75 ohm unbalanced BNC) in the
redundant configuration, that make up two DS3 ports. These ports connect to two DS3 interfaces,
called Primary and Secondary (the secondary DS3 interface is optional). Each Controller card, also
called primary and secondary (the secondary Controller card is optional), has a single DS3
interface.
DS1 and E1 Ports
The Wide Bank’s low-speed ports are accessible through two 64-pin connectors. You can use two
of Carrier Access’ low speed cables to connect 28 DS1s or 21 E1s from standard low-speed patch
panels to the Wide Bank 28 DS3.
Any digital equipment may be terminated on both ends at a standard level crossconnect. The
crossconnect provides a convenient central facility for circuit rearrangements, patching, and testing.
The Wide Bank’s DS1 interfaces provide crossconnects at Digital Signal Crossconnect Level 1
(DSX-1) per ANSI T1.102. The E1 interfaces meet the crossconnect requirements of ITU-T/G.703.
Independent Clocking and Transparent Framing
Because of independent timing and transparent framing, the installation and maintenance of the
DS1 or E1 connections are easily managed. Because the Wide Bank 28 DS3 transmits DS1 or E1
streams transparently into a DS3 composite, there are no framing or timing options to set on the 28
DS1 or 21 E1 connections. The Wide Bank transparently passes the framing and clocking as
applications change. DS1 line coding, optioned as either AMI or B8ZS, is the only Wide Bank 28
DS3 T1 configuration normally needed to access DS3 carrier services. E1 line coding is fixed as
HDB3 and need not be configured to access DS3 carrier services.
By using M1-3 multiplexers, independently clocked DS1 and E1 carrier service connections can be
carried in the same DS3 line. Each Wide Bank connection derives clocking from either end of the
DS1 or E1 connection, as appropriate for the network requirements.
The Wide Bank 28 DS3 transmits all possible DS1 and E1 framing formats transparently on each
of the low-speed connections. Framing transparency allows the customer and end-carriers to frame
(or not frame) each of the low-speed connections appropriately for the voice or data application
desired. Mixed carrier services can share the same DS3 access line.
DS1 end-to-end transparency for Extended Superframe (ESF) also provides important management
capabilities from the end-carriers to the customer. The Wide Bank allows complete ESF
communications to each end of the DS1 connection.