Timing - General DataComm SpectraComm SRM-6 Installation & Operation Manual

Introduction and Specifications

Timing

In 4-wire, leased private line modem applications that use aggregate data rates of 19.2, 28.8, or 33.6
Kbps, the SRM-6 gets its transmit timing from the SC V.F28.8 modem or one of the DTEs. One
modem is configured for Internal or External transmit timing, with the modem on the other side
configured for Receive transmit timing. In DDS network applications requiring aggregate data rates
of 56 and 64 Kbps, the SRM-6 gets its transmit timing from the DSU that is configured for Receive
transmit timing.
Note
For more information on configuring transmit timing in the modem or DSU, refer to the corresponding
manual listed inside the front cover of this document.
CENTRAL SITE
Provides
SRM-6
Clock
(Pin 24) Chan. 1
DTE
Channel 1
Tx Clock
set to TT
Figure 1-2
1-4
External
4-Wire Leased
Timing
(Pin 24)
MODEM
Aggregate
Tx Clock set to
Channel 1 TT
Terminal Timing in a SRM-6 System
SC SRM-6 Multiplexer
Installation & Operation Manual
SpectraComm SRM-6 Overview
Receive
Timing
Private Line
(Pin 15)
MODEM
Aggregate
Tx Clock
set to ST
REMOTE SITE
Receive
SRM-6
Timing
(Pin 15)
Chan. 1
DTE
Channel 1
Tx Clock
set to ST
076R176-000
Issue 1