Ibs Clock/Data Recovery And De-Jitter; Ibs Framing; Ibs Engineering Service Channel; Ibs Scrambling - Comtech EF Data CDM-600L Installation And Operation Manual

CDM-600L Satellite Modem
Open Network Operations
9.2.1

IBS Clock/data recovery and De-jitter

Performs clock and data recovery on the G.703 format. Clock de-jitter and data
encoding/decoding is done as with the IDR configuration.
9.2.2

IBS Framing

Multiplexes/demultiplexes the primary data in compliance with the standard IESS-309
overhead ratio of 1/15 (4 overhead bytes per 60 data bytes) and provides the rate
exchanged transmit clock to the modulator portion of the base modem.
9.2.3

IBS Engineering Service Channel

Bi-directional processing of the components of the ESC channel, including the ASYNC
or SYNC RS-232 data channel, and fault/alarm indications.
A second high-rate ESC channel, at up to 1/20
using ASYNC RS-232 format.
9.2.4

IBS Scrambling

Provides the synchronous scrambling/descrambling of the satellite-framed data specified
in IESS-309. Base modem scrambling/descrambling is disabled in this mode.
9.3

Drop and Insert

G.703, RS-422, V.35, and
Serial LVDS
Satellite Data Rates Supported
(all have 16/15 overhead)
Terrestrial Framing Supported
Satellite Overhead Rate
Timeslot Selection Range
Plesiochronous Buffer Sizes
Buffer Clock Reference
th
of the primary data rate is available,
Primary Data Rates Supported
1544 kbps SD, RD, DDO, IDI
2048 kbps SD, RD, DDO, IDI
N x 64 kbps
N = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, or 24 (T1)
N = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, or 30 (E1-CCS)
N = 1, 2, 4, 6, 8, 12, 16, 24, 30 (E1-CAS)
G.732/G.733, G.704
16/15 of data rate per IESS-308 Rev. 6 and IESS-309 Rev. 3,
or higher
1 to 24 (all T1 modes)
1 to 30 (E1-CAS and E1-CCS)
Arbitrary order, non-contiguous available
Selectable size of 64 to 262,144 bits, in 16-bit steps (with
added limitations for G.704 frame boundaries)
Derived from Insert-Data-In (Insert Clock)
External, Rx (satellite) or Tx (Terrestrial)
9–2
Revision 2
MN/CDM600L.IOM