GDC OCM-1000
Office Communication Manager
Hybrid Access Networking Device
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GDC GDC OCM-1000 Office
Communication Manager
Hybrid Access Networking Device
OVERVIEW
General DataComm’s OCM 1000 is a Hybrid Access Networking Device (HAND) for
point-to-point, point-to-multipoint, and point-to-network applications with a
growth path to the power of the TMS 3000
system.
The OCM 1000 offers connectivity to a variety of carrier services, allowing
users to select the configuration with the best cost/performance ratio for their
network environment. These service options include 9.6 to 28.8 Kbps analog
services; 56/64 Kbps leased line services; fractional T1/E1 services (groomed N
x 56/64 Kbps services); and T1/E1 services. The OCM 1000 offers investment
protection because it can be upgraded to participate in a large Transport
Managment System (TMS) backbone network simply by swapping a common logic
module. There is no need to discard network equipment and the initial
investment as requirements grow.
ARCHITECTURE The OCM 1000 is extremely
flexible. It supports up to two full E1 (2.048 Mbps) or T1 (1.544 Mbps)
aggregates. The base system accommodates both circuit and packet switched
operation. Plug-in cards use the backplane architecture to implement various
circuit and packet capabilities.
APPLICATION SUPPORT The OCM 1000 supports a
comprehensive range of applications, including LAN
internetworking, videoconferencing and imaging, as well as traditional voice and
data applications. These applications are consolidated and transported
across a single communications path between OCM 1000s. Brief discussions of
common OCM 1000 applications follow.
PRIVATE NETWORK ACCESS The OCM 1000 serves
used as a multiple aggregate network multiplexer for small private networks. It
is configurable to access the private network over public or private
transmission facilities, via either narrowband or wideband circuits. In a
private network, up to four remote OCM 1000s are supported via the OCM 1500
split shelf.
PUBLIC NETWORK ACCESS In a public network,
the OCM 1000 provides T1/E1 bandwidth provisioning
service. The OCM can deliver 24 (T1) or 31 (E1) 56/64 Kbps channels for
cross-connection at a carrier’s
central office. A channel from one T1/E1 interface may be cross-connected to
another wideband interface, or provisioned as a narrowband circuit terminating
on a CSU or DSU. Channels can also be cross-connected to the carrier’s frame
relay service.
INTEGRATED TURBO DATA COMPRESSION Using the
public network to “groom” 56/64 Kbps data, the
OCM 1000 provides integral data compression with throughput rates exceeding 256
Kbps. This arrangement
can rival the cost/performance benefit of public frame relay service by
providing fractional T1/E1 throughput on 56/64 Kbps circuits. A single OCM
can combine multiple remote data compression channels onto one T1/E1 aggregate
while providing end-to-end management and statistics of the compressed data
network.
LAN BRIDGING AND ROUTING With the OCM Packet Processor (OPP) module,
LAN bridging and routing
functions are integrated into the OCM 1000. Through the OPP, the OCM 1000
supports full LAN connectivity across the network in both homogeneous
(Ethernet-Ethernet and Token Ring-Token Ring) and heterogeneous environments
(Ethernet-Token Ring). This powerful capability provides LAN segmentation for
local LANs in the small business environment, as well as connection to a remote
location over digital services. The OCM also supports all major LAN
internetworking methods: Self Learning (Spanning Tree) bridging, IBM’s Source
Routing, and Multiprotocol Routing (including TCP/IP and IPX). In T1/E1
groomed environments, the OPP acts as an IP/IPX FRAD, allowing LAN traffic to be
encapsulated in frame relay and groomed to a public frame relay network.
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