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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
=-=-=-=-=-=-=-=-=-=-=-=-= Section D -- Cellular Telephony =-=-=-=-=-=-=-=-=
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
D-01. What is a MTSO?
MTSO stands for Mobile Telephone Switching Office. The MTSO is the
switching office that connects all of the individual cell towers to the
Central Office (CO).
The MTSO is responsible for monitoring the relative signal strength of
your cellular phone as reported by each of the cell towers, and
switching your conversation to the cell tower which will give you the
best possible reception.
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D-02. What is a NAM?
NAM stands for Number Assignment Module. The NAM is the EPROM that
holds information such as the MIN and SIDH. Cellular fraud is committed
by modifying the information stored in this component.
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D-03. What is an ESN?
ESN stands for Electronic Serial Number. The is the serial number of
your cellular telephone which is transmitted to the cell site, and used
in conjuction with the NAM to verify that you are a legitimate user on
the system.
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D-04. What is a MIN?
MIN stands for Mobile Identification Number. This is the phone number
of the cellular telephone.
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D-05. What is a SCM?
SCM stands for Station Class Mark. The SCM is a 4 bit number which
holds three different pieces of information. Your cellular telephone
transmits this information (and more) to the cell tower. Bit 1 of the
SCM tells the cell tower whether your cellphone uses the older 666
channel cellular system, or the newer 832 channel cellular system. The
expansion to 832 channels occured in 1988. Bit 2 tells the cellular
system whether your cellular telephone is a mobile unit or a voice
activated cellular telephone. Bit's 3 and 4 tell the cell tower what
power your cellular telephone should be transmitting on.
Bit 1: 0 == 666 channels
1 == 832 channels
Bit 2: 0 == Mobile cellular telephone
1 == Voice activated cellular telephone
Bit 3/4: 00 == 3.0 watts (Mobiles)
01 == 1.2 watts (Transportables)
10 == .06 watts (Portables)
11 == Reserved for future use
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D-06. What is a SIDH?
SIDH stands for System Identification for Home System. The SIDH in your
cellular telephone tells the cellular system what system your cellular
service originates from. This is used in roaming (making cellular calls
when in an area not served by your cellular provider).
Every geographical region has two SIDH codes, one for the wireline
carrier and one for the nonwireline carrier. These are the two
companies that are legally allowed to provide cellular telephone service
in that region. The wireline carrier is usually your local telephone
company, while the nonwireline carrier will be another company. The
SIDH for the wireline carrier is always an even number, while the SIDH
for the nonwireline carrier is always an odd number. The wireline
carrier is also known as the Side-B carrier and the non-wireline carrier
is also known as the Side-A carrier.
SIDH is often abbreviated to SID.
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D-07. What are the forward/reverse channels?
Forward channels are the frequencies the cell towers use to talk to your
cellular telephone. Reverse channels are the frequencies your cellular
telephone uses to talk to the cell towers.
The forward channel is 45 mhz above the reverse channel. For example, if
the reverse channel is at 824 mhz, the forward channel would be at 869 mhz.
SECTION E |
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All content copyright 1998 - 99 unless book covers or otherwise noted. Book covers copyright 1998 - 99 Amazon.com. All OSAll-owned content may be reprinted with the following header added: "Copyright 1998 - 99 Owl Services. Visit aviary-mag.com for computer security news and information." Article authors retain a non-exclusive right to republish their work. 324 |
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