Megaplex-2100 Module
LS-2A
10/6-Channel Sync/Async Low Speed Data
Module for X.50, X.58 or SDM Multiplexing
DESCRIPTION
• LS-2A modules can be grouped
• The LS-2A module provides
multiple low speed synchronous
or asynchronous data user (sub)
channels, supporting rates of 2.4,
4.8, 9.6, or 19.2 kbps. LS-2A
multiplexes the channels, so that
they can be placed in a single
standard 64-kbps timeslot of a T1
or E1 frame. These modules can
be used for both point-to-point
applications or for accessing
subrate public networks.
•
• LS-2A modules employ different
FEATURES
• Provides low speed channels
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for point-to-point or
network applications
10 or 6 sync/async
sub-channels per module
Sub-channel data rates of
2.4, 4.8, 9.6, or 19.2 kbps
Compatible with X.50, X.58,
or SDM networks
V.24/RS-232 interface
Two X.50 or SDM modules
support up to 20 x 2.4 kbps
sub-channels in one timeslot
• Four X.58 modules support
up to 24 x 2.4 kbps
sub-channels in one timeslot
• Fits into any I/O slot of the
MP-2100/MP-2104 chassis
methods to multiplex the low
speed sub-channels into timeslots.
Module versions are available to
support either X.50, SDM or X.58
multiplexing standards.
LS-2A/X.50 and LS-2A/SDM
support up to ten V.24/RS-232
sub-channels per module.
LS-2A/X.58 modules support up to
six sub-channels.
• LS-2A/X.50 uses a multiplexing
technique compatible with ITU
recommendation X.50, Div. 3,
and ITU X.54. LS-2A/SDM uses a
multiplexing technique
compatible with AT&T
PUB 54075 (DS0-B format). Both
techniques define the
multiplexing frame, utilizing an
8-bit envelope structure. The
contents of one frame consists of
5, 10 or 20 bytes, allowing
envelope “bearer” rates of 25.6,
12.8, 6.4 and 3.2 kbps, for the
carried sub-channels (at 19.2, 9.6,
4.8 and 2.4 kbps, respectively).
• LS-2A/X.58 uses a multiplexing
technique compatible with ITU
recommendation X.58. An octet
structure is used for the
multiplexing frame. Multiplexing
efficiency is 90%, providing a
more efficient use of the
bandwidth than either X.50 or
SDM.
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together to maximize the number
of sub-channels carried by a single
timeslot. Two LS-2A/X.50 or /SDM
modules operating together
support up to 20 x 2.4 kbps
sub-channels in one timeslot. Two
LS-2A/X.58 modules operating
together support up to
12 x 4.8 kbps sub-channels in one
timeslot; four modules support up
to 24 x 2.4 kbps sub-channels.
The LS-2A/2TS module uses a
multiplexing format similar to that
of the LS-2A/X.50, but can transmit
over two separate timeslots. This
version is designed to transmit up
to ten 9.6 kbps sub-channels using
a single module.
Async/sync conversion control and
async data bits are independently
switch-selectable per sub-channel
group (CH1, CH2–5 and CH6–10
for X.50 and SDM; CH1, CH2–3
and CH4–6 for X.58). Conversion
complies with ITU V.22.
Each sync LS-2A sub-channel can
be configured to operate in either
DCE, External-DCE, or DTE timing
modes. External-DCE mode is for
tail-end applications (provides Rx
clock, while receiving Tx clock
from the user equipment).
The control signals associated with
each sub-channel are supported
locally. RTS is returned locally as
CTS, DSR is continuously on, and
DCD is on when synchronized.
Sub-channel and system
parameters are configurable via
terminal interface, or via the
RADview management systems.
The sub-channels terminate on
two high-density connectors, with
five sub-channels per connector
(three for X.58). Special octopus
cables are available for connecting
five sub-channels to separate DTE
or DCE equipment. Alternatively,
a separate cross-cable can be used
for connecting a single channel to
a DCE.
Megaplex-2100 Module
LS-2A
10/6-Channel Sync/Async Low Speed Data Module for X.50, X.58 or SDM Multiplexing
SPECIFICATIONS
• No. of Sub-Channels per Module
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LS-2A/X.50, /SDM, /2TS: 10
LS-2A/X.58: 6
No. of Sub-Channels per Group
See Table 1. Modules are grouped
together (up to 4) to fully utilize a
single timeslot
Interface Standard
V.24/RS-232
Async to Sync Conversion
ITU-T V.22 compliant, selectable
per groups of sub-channels:
X.50, SDM: CH1, CH2–5, CH6–10
X.58: CH1, CH2–3, CH4–6
Async Parameters
Data bits: 5, 6, 7, 8
Stop bits: 1
Parity: transparent transfer
Sub-Channel Data Rates
2.4, 4.8, 9.6, or 19.2 kbps
(9.6 kbps only for LS-2A/2TS)
Multiplexing Format
LS-2A/X.50, LS-2A/2TS:
ITU-T X.50 Div. 3, ITU-T X.54
LS-2A/X.58: ITU-T X.58
LS-2A/SDM: AT&T PUB 54075
(DS0-B format)
APPLICATIONS
• Timing
Selectable per sync sub-channel:
DCE for connection to user DTE
EXT-DCE for tail-end application
DTE for connection to user DCE
• Connectors
2 D-type, 44-pin, female:
X.50, SDM: one per CH1–5,
one per CH6–10
X.58: one per CH1–3, CH4–6
• Control Signals
Selectable RTS to CTS delay:
min delay (up to 20 msec),
50 msec (±10), or constantly on
DSR: constantly on
DCD: on when synchronized, or
constantly on
Table 1. Sub-Channels per Group
No. of channels (max over 1 TS)
[number of modules required]
Channel
data rate
[kbps]
X.50,
SDM
2.4
20 [2]
–
24 [4]
4.8
10 [1]
–
12 [2]
9.6
5 [1]
19.2
2 (plus
1 x 9.6) [1]
• Diagnostics
2TS (X.50)
X.58
10 [1]
over 2 TS
–
V.54 local and remote loops:
1, 2 and 3
6 [1]
3 [1]
• Indicators
Sync Loss (red) – loss of
synchronization between local
and remote LS-2A modules
• Configuration
Programmable via the
Management System
ORDERING
MP-2100M-LS-2A/*
10/6-Channel Low-Speed Module
* Specify multiplexing method:
X50 for X.50
X58 for X.58
SDM for SDM
2TS for X.50 module that
transmits 10 x 9.6 kbps
channels over two timeslots
OPTIONAL ACCESSORIES
CBL-LS201
Octopus cable with five male DB-25
connectors, for connecting each
44-pin connector of LS-2A directly to
user DTE equipment. Cable length is
2m (6 ft).
CBL-LS203
Octopus cross-cable with five male
DB-25 connectors, for connecting
each 44-pin connector of LS-2A
directly to user DCE equipment.
Cable length is 2m (6 ft).
CBL-LS102
Cross-cable for connecting a single
sub-channel on the CBL-LS201 cable
to a DCE. Cable length is 30 cm (1 ft).
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Specifications are subject to change without prior notice.