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回收CISCO NM PA系列

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PA-MC-2T3+思科原装线卡模块
发布时间:2013-12-4 15:09:20 点击量:

PA-MC-2T3+产品简介

The PA-MC-2T3+ is PA-MC-2T3+思科原装线卡模块a single-width port adapter that provides two T3 interface connections using BNC connectors.Each T3 interface can be independentPA-MC-2T3+思科原装线卡模块ly configured to be either channelized or unchannelized. A channelized T3 provides 28 T1 lines multiplexed into the T3. Each T1 line can be configured into one or more serial interface data channels.PA-MC-2T3+思科原装线卡模块

An unchannelized T3 provides a single serial interface data channel that may be configured to use all of the T3 bandwidth or a fractional portion of it. PA-MC-2T3+思科原装线卡模块This mode is compatible with several vendors of fractional (subrate) DS3 data service units (DSUs).

Figure 1-1 PA-MC-2T3+—Front Panel



The PA-MC-2T3+ has the following features and physical characteristics:PA-MC-2T3+思科原装线卡模块

The PA-MC-2T3+ supports both channelized and unchannelized operations.

It transmits and receives data bidirectionally at the T3 rate of 44.736 Mbps.

It conforms to relevant specifications for DS3 (Digital Signal Level 3) circuits.

The T3 connection, provided by two female BNC connectors for transmit (TX) and receive (RX), requires 734A coaxial cable that has an impedance of 75 ohms.

It supports RFC 1406 and RFC 1407 (CISCO-RFC-1407-CAPABILITY.my). For RFC 1406, Cisco supports all tables except the FarEnd table. For RFC 1407, Cisco does not support FarEnd or Fractional tables. (For information on accessing Cisco MIB files, refer to the Cisco MIB User Quick Reference publication.)

PA-MC-2T3+ microcode is loaded at initialization and is bundled into IOS software.

Channelized T3 Overview PA-MC-2T3+思科原装线卡模块

In the channelized mode of operation, a PA-MC-2T3+ T3 link is channelized into 28 DS1 data lines in an industry standard multiplexing format.

Each of the T1 lines contains 24 timeslots of 64 or 56 kbps each. The T1 lines can support one or more user data channels which appear to the system as serial interfaces. Each serial interface is assigned one or more of the timeslots giving the serial interface a bandwidth of n x 56 kbps or n x 64 kbps, where n is the number of timeslots assigned. Any unused timeslots of the T1 are filled with an idle channel pattern. PA-MC-2T3+思科原装线卡模块

The following restrictions apply: A timeslot can only be used by one serial interface. A serial interface cannot use timeslots from more than one T1 line. Each T3 can have a maximum of 128 serial interfaces. Unused serial interfaces on one T3 cannot be used by the other T3.

The PA-MC-2T3+ supports Cisco High-Level Data Link Control (HDLC), Frame Relay, PPP, and Switched Multimegabit Data Service (SMDS) Data Exchange Interface (DXI) encapsulations over each serial interface.

 

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