Appendix D PSAX Module Features
Fiber-Optic Interface Modules
D-28
255-700-447
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
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Per port:
•
port 1 supports 10 Mbps (10BASE-T) or 100 Mbps (100BASE-T);
•
ports 2, 3, 4, and 5 each support 10 Mbps
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Aggregate bandwidth of all ports, maximum: 30 Mbps throughput
•
Line encoding modes: NA
•
Loopback capabilities: NA
•
Line build out: NA
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Framing modes: NA
Fiber-Optic Interface Modules
1-Port Channelized OC-3/STM-1 CES Module (23N12 (MM)/23N13 (SM))
The 1-Port Channelized OC-3/STM-1 CES modules (23N13 (SM) and 23N12
(MM)) offer two operating modes:
•
The OC-3 CES operational mode supports 84 asynchronous VT1.5s (DS1s),
with each DS1 supporting 24 DS0s. In the OC-3 mode, up to 2 DS0s per T1
can be configured for the HDLC support.
•
The STM-1 operating mode supports 63 asynchronous, channelized VC-12
(E1) interfaces for circuit emulation services (ISDN) and the HDLC
Passthrough Interface. Each E1 supports 30 DS0s.
The line rate of the modules is approximately 155 Mbps. The linear 1+1
APS/MSP feature provides protection against facility, port, or module failure.
The linear APS/MSP feature supports 1+1 protection only; the N:1 protection
feature is not supported by this module.
The 1+1 architecture consists of a far-end signal that is continuously bridged
(at the electrical level) to the APS/MSP working and APS/MSP protection I/O
modules so that the same payloads are transmitted identically to the near-
end working and protection I/O modules. At the near-end, the working and
protection OC-3/STM-1 signals are monitored independently and identically
for failures. The receiving I/O modules select either the working or the pro-
tection signal as the one from which to select the traffic, based on switch ini-
tiation criteria. Because of the continuous far-end bridge, the 1+1 architec-
ture does not allow an unprotected extra traffic channel to be provided.
The module is supplied with the following transmission types:
•
Single-mode (SM) module (23N13) is intended for long-reach applications,
typically between LANs. This module is frequently used to connect high-
speed LAN devices (such as routers) to an ATM network.
•
Multimode (MM) module (23N12) is intended for short-reach applications,
for example, interoffice or intraoffice sections of a local area network
(LAN).
Software Features
The 1-Port Channelized OC-3/STM-1 CES module supports the following
services:
•
Circuit emulation service (CES):
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