
Configuring Line Services
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An MCT1 interface can transmit or receive up to 24 DS-0 (56/64 Kb/s) channels
per DS-1 frame over leased point-to-point links. The MCE1 interface can transmit
or receive up to 30 DS-0s (64 Kb/s).
The MCE1 and MCT1both include an integrated DSU/CSU for direct connection
to an E1 or T1 network. The interfaces provide integrated support for loopback
testing and basic error rate test (BERT) line testing.
Synchronous Overview
A synchronous interface connects a Bay Networks router or switch to a DCE,
such as DSUs, CSUs, and modems. The synchronous interface supports a range of
physical connections including V.35, RS232, RS449/422 balanced, and X.21.
The synchronous interface supports many WAN software services, including PPP,
X.25, Frame Relay, SMDS, HDLC encapsulation, and ATM DXI. A single
synchronous interface operates from 1200 b/s to a maximum of 2.048 Mb/s, full
duplex.
You can configure synchronous interfaces to integrate IBM SDLC traffic into the
internetwork. Traffic is integrated by connecting local or remote IBM equipment
directly to the Synchronous interface and using either the DLSw for SDLC or
Transparent Sync Pass-Thru features.
The synchronous interface supports both leased and dial-up circuits. Dial
Back-up, Dial-on-Demand, and Bandwidth-on-Demand using Raise DTR and
V.25bis dial signaling are supported over V.35, RS232, and X.21 interfaces.
T1 Overview
T1 services use digital signals to allow two pairs of wires to carry 24 voice or data
transmissions.
Table 2-3 shows the specification for a T1 line.
Table 2-3. Specification for T1 Line
Attribute Value
Framing rate 8000 frames/s
Channels per frame 24
Line speed 1.544 Mb/s
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